1 # SPDX-License-Identifier: GPL-2.0-only !! 1 # $Id: config.in,v 1.158 2002/01/24 22:14:44 davem Exp $
2 # <<
3 # For a description of the syntax of this conf 2 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.rs !! 3 # see the Configure script.
5 # 4 #
6 5
>> 6 mainmenu "Linux/UltraSPARC Kernel Configuration"
>> 7
7 config 64BIT 8 config 64BIT
8 bool !! 9 def_bool y
9 10
10 config 32BIT !! 11 config MMU
11 bool 12 bool
>> 13 default y
12 14
13 config RISCV !! 15 source "init/Kconfig"
14 def_bool y <<
15 select ACPI_GENERIC_GSI if ACPI <<
16 select ACPI_MCFG if (ACPI && PCI) <<
17 select ACPI_PPTT if ACPI <<
18 select ACPI_REDUCED_HARDWARE_ONLY if A <<
19 select ACPI_SPCR_TABLE if ACPI <<
20 select ARCH_DMA_DEFAULT_COHERENT <<
21 select ARCH_ENABLE_HUGEPAGE_MIGRATION <<
22 select ARCH_ENABLE_MEMORY_HOTPLUG if S <<
23 select ARCH_ENABLE_MEMORY_HOTREMOVE if <<
24 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if <<
25 select ARCH_ENABLE_THP_MIGRATION if TR <<
26 select ARCH_HAS_BINFMT_FLAT <<
27 select ARCH_HAS_CURRENT_STACK_POINTER <<
28 select ARCH_HAS_DEBUG_VIRTUAL if MMU <<
29 select ARCH_HAS_DEBUG_VM_PGTABLE <<
30 select ARCH_HAS_DEBUG_WX <<
31 select ARCH_HAS_FAST_MULTIPLIER <<
32 select ARCH_HAS_FORTIFY_SOURCE <<
33 select ARCH_HAS_GCOV_PROFILE_ALL <<
34 select ARCH_HAS_GIGANTIC_PAGE <<
35 select ARCH_HAS_KCOV <<
36 select ARCH_HAS_KERNEL_FPU_SUPPORT if <<
37 select ARCH_HAS_MEMBARRIER_CALLBACKS <<
38 select ARCH_HAS_MEMBARRIER_SYNC_CORE <<
39 select ARCH_HAS_MMIOWB <<
40 select ARCH_HAS_NON_OVERLAPPING_ADDRES <<
41 select ARCH_HAS_PMEM_API <<
42 select ARCH_HAS_PREPARE_SYNC_CORE_CMD <<
43 select ARCH_HAS_PTE_DEVMAP if 64BIT && <<
44 select ARCH_HAS_PTE_SPECIAL <<
45 select ARCH_HAS_SET_DIRECT_MAP if MMU <<
46 select ARCH_HAS_SET_MEMORY if MMU <<
47 select ARCH_HAS_STRICT_KERNEL_RWX if M <<
48 select ARCH_HAS_STRICT_MODULE_RWX if M <<
49 select ARCH_HAS_SYNC_CORE_BEFORE_USERM <<
50 select ARCH_HAS_SYSCALL_WRAPPER <<
51 select ARCH_HAS_TICK_BROADCAST if GENE <<
52 select ARCH_HAS_UBSAN <<
53 select ARCH_HAS_VDSO_DATA <<
54 select ARCH_KEEP_MEMBLOCK if ACPI <<
55 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABL <<
56 select ARCH_OPTIONAL_KERNEL_RWX if ARC <<
57 select ARCH_OPTIONAL_KERNEL_RWX_DEFAUL <<
58 select ARCH_STACKWALK <<
59 select ARCH_SUPPORTS_ATOMIC_RMW <<
60 select ARCH_SUPPORTS_CFI_CLANG <<
61 select ARCH_SUPPORTS_DEBUG_PAGEALLOC i <<
62 select ARCH_SUPPORTS_HUGETLBFS if MMU <<
63 # LLD >= 14: https://github.com/llvm/l <<
64 select ARCH_SUPPORTS_LTO_CLANG if LLD_ <<
65 select ARCH_SUPPORTS_LTO_CLANG_THIN if <<
66 select ARCH_SUPPORTS_PAGE_TABLE_CHECK <<
67 select ARCH_SUPPORTS_PER_VMA_LOCK if M <<
68 select ARCH_SUPPORTS_RT <<
69 select ARCH_SUPPORTS_SHADOW_CALL_STACK <<
70 select ARCH_USE_CMPXCHG_LOCKREF if 64B <<
71 select ARCH_USE_MEMTEST <<
72 select ARCH_USE_QUEUED_RWLOCKS <<
73 select ARCH_USE_SYM_ANNOTATIONS <<
74 select ARCH_USES_CFI_TRAPS if CFI_CLAN <<
75 select ARCH_WANT_BATCHED_UNMAP_TLB_FLU <<
76 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_ <<
77 select ARCH_WANT_FRAME_POINTERS <<
78 select ARCH_WANT_GENERAL_HUGETLB if !R <<
79 select ARCH_WANT_HUGE_PMD_SHARE if 64B <<
80 select ARCH_WANT_LD_ORPHAN_WARN if !XI <<
81 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP <<
82 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEM <<
83 select ARCH_WANTS_NO_INSTR <<
84 select ARCH_WANTS_THP_SWAP if HAVE_ARC <<
85 select BINFMT_FLAT_NO_DATA_START_OFFSE <<
86 select BUILDTIME_TABLE_SORT if MMU <<
87 select CLINT_TIMER if RISCV_M_MODE <<
88 select CLONE_BACKWARDS <<
89 select COMMON_CLK <<
90 select CPU_PM if CPU_IDLE || HIBERNATI <<
91 select EDAC_SUPPORT <<
92 select FRAME_POINTER if PERF_EVENTS || <<
93 select FTRACE_MCOUNT_USE_PATCHABLE_FUN <<
94 select GENERIC_ARCH_TOPOLOGY <<
95 select GENERIC_ATOMIC64 if !64BIT <<
96 select GENERIC_CLOCKEVENTS_BROADCAST i <<
97 select GENERIC_CPU_DEVICES <<
98 select GENERIC_CPU_VULNERABILITIES <<
99 select GENERIC_EARLY_IOREMAP <<
100 select GENERIC_ENTRY <<
101 select GENERIC_GETTIMEOFDAY if HAVE_GE <<
102 select GENERIC_IDLE_POLL_SETUP <<
103 select GENERIC_IOREMAP if MMU <<
104 select GENERIC_IRQ_IPI if SMP <<
105 select GENERIC_IRQ_IPI_MUX if SMP <<
106 select GENERIC_IRQ_MULTI_HANDLER <<
107 select GENERIC_IRQ_SHOW <<
108 select GENERIC_IRQ_SHOW_LEVEL <<
109 select GENERIC_LIB_DEVMEM_IS_ALLOWED <<
110 select GENERIC_PCI_IOMAP <<
111 select GENERIC_PTDUMP if MMU <<
112 select GENERIC_SCHED_CLOCK <<
113 select GENERIC_SMP_IDLE_THREAD <<
114 select GENERIC_TIME_VSYSCALL if MMU && <<
115 select GENERIC_VDSO_TIME_NS if HAVE_GE <<
116 select HARDIRQS_SW_RESEND <<
117 select HAS_IOPORT if MMU <<
118 select HAVE_ARCH_AUDITSYSCALL <<
119 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ <<
120 select HAVE_ARCH_HUGE_VMAP if MMU && 6 <<
121 select HAVE_ARCH_JUMP_LABEL if !XIP_KE <<
122 select HAVE_ARCH_JUMP_LABEL_RELATIVE i <<
123 select HAVE_ARCH_KASAN if MMU && 64BIT <<
124 select HAVE_ARCH_KASAN_VMALLOC if MMU <<
125 select HAVE_ARCH_KFENCE if MMU && 64BI <<
126 select HAVE_ARCH_KGDB if !XIP_KERNEL <<
127 select HAVE_ARCH_KGDB_QXFER_PKT <<
128 select HAVE_ARCH_MMAP_RND_BITS if MMU <<
129 select HAVE_ARCH_MMAP_RND_COMPAT_BITS <<
130 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFS <<
131 select HAVE_ARCH_SECCOMP_FILTER <<
132 select HAVE_ARCH_STACKLEAK <<
133 select HAVE_ARCH_THREAD_STRUCT_WHITELI <<
134 select HAVE_ARCH_TRACEHOOK <<
135 select HAVE_ARCH_TRANSPARENT_HUGEPAGE <<
136 select HAVE_ARCH_USERFAULTFD_MINOR if <<
137 select HAVE_ARCH_VMAP_STACK if MMU && <<
138 select HAVE_ASM_MODVERSIONS <<
139 select HAVE_CONTEXT_TRACKING_USER <<
140 select HAVE_DEBUG_KMEMLEAK <<
141 select HAVE_DMA_CONTIGUOUS if MMU <<
142 select HAVE_DYNAMIC_FTRACE if !XIP_KER <<
143 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT <<
144 select HAVE_DYNAMIC_FTRACE_WITH_ARGS i <<
145 select HAVE_FTRACE_MCOUNT_RECORD if !X <<
146 select HAVE_FUNCTION_GRAPH_TRACER <<
147 select HAVE_FUNCTION_GRAPH_RETVAL if H <<
148 select HAVE_FUNCTION_TRACER if !XIP_KE <<
149 select HAVE_EBPF_JIT if MMU <<
150 select HAVE_GUP_FAST if MMU <<
151 select HAVE_FUNCTION_ARG_ACCESS_API <<
152 select HAVE_FUNCTION_ERROR_INJECTION <<
153 select HAVE_GCC_PLUGINS <<
154 select HAVE_GENERIC_VDSO if MMU && 64B <<
155 select HAVE_IRQ_TIME_ACCOUNTING <<
156 select HAVE_KERNEL_BZIP2 if !XIP_KERNE <<
157 select HAVE_KERNEL_GZIP if !XIP_KERNEL <<
158 select HAVE_KERNEL_LZ4 if !XIP_KERNEL <<
159 select HAVE_KERNEL_LZMA if !XIP_KERNEL <<
160 select HAVE_KERNEL_LZO if !XIP_KERNEL <<
161 select HAVE_KERNEL_UNCOMPRESSED if !XI <<
162 select HAVE_KERNEL_ZSTD if !XIP_KERNEL <<
163 select HAVE_KERNEL_XZ if !XIP_KERNEL & <<
164 select HAVE_KPROBES if !XIP_KERNEL <<
165 select HAVE_KRETPROBES if !XIP_KERNEL <<
166 # https://github.com/ClangBuiltLinux/l <<
167 select HAVE_LD_DEAD_CODE_DATA_ELIMINAT <<
168 select HAVE_MOVE_PMD <<
169 select HAVE_MOVE_PUD <<
170 select HAVE_PAGE_SIZE_4KB <<
171 select HAVE_PCI <<
172 select HAVE_PERF_EVENTS <<
173 select HAVE_PERF_REGS <<
174 select HAVE_PERF_USER_STACK_DUMP <<
175 select HAVE_POSIX_CPU_TIMERS_TASK_WORK <<
176 select HAVE_PREEMPT_DYNAMIC_KEY if !XI <<
177 select HAVE_REGS_AND_STACK_ACCESS_API <<
178 select HAVE_RETHOOK if !XIP_KERNEL <<
179 select HAVE_RSEQ <<
180 select HAVE_RUST if RUSTC_SUPPORTS_RIS <<
181 select HAVE_SAMPLE_FTRACE_DIRECT <<
182 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI <<
183 select HAVE_STACKPROTECTOR <<
184 select HAVE_SYSCALL_TRACEPOINTS <<
185 select HOTPLUG_CORE_SYNC_DEAD if HOTPL <<
186 select IRQ_DOMAIN <<
187 select IRQ_FORCED_THREADING <<
188 select KASAN_VMALLOC if KASAN <<
189 select LOCK_MM_AND_FIND_VMA <<
190 select MMU_GATHER_RCU_TABLE_FREE if SM <<
191 select MODULES_USE_ELF_RELA if MODULES <<
192 select OF <<
193 select OF_EARLY_FLATTREE <<
194 select OF_IRQ <<
195 select PCI_DOMAINS_GENERIC if PCI <<
196 select PCI_ECAM if (ACPI && PCI) <<
197 select PCI_MSI if PCI <<
198 select RISCV_ALTERNATIVE if !XIP_KERNE <<
199 select RISCV_APLIC <<
200 select RISCV_IMSIC <<
201 select RISCV_INTC <<
202 select RISCV_TIMER if RISCV_SBI <<
203 select SIFIVE_PLIC <<
204 select SPARSE_IRQ <<
205 select SYSCTL_EXCEPTION_TRACE <<
206 select THREAD_INFO_IN_TASK <<
207 select TRACE_IRQFLAGS_SUPPORT <<
208 select UACCESS_MEMCPY if !MMU <<
209 select USER_STACKTRACE_SUPPORT <<
210 select ZONE_DMA32 if 64BIT <<
211 16
212 config RUSTC_SUPPORTS_RISCV <<
213 def_bool y <<
214 depends on 64BIT <<
215 # Shadow call stack requires rustc ver <<
216 # -Zsanitizer=shadow-call-stack flag. <<
217 depends on !SHADOW_CALL_STACK || RUSTC <<
218 <<
219 config CLANG_SUPPORTS_DYNAMIC_FTRACE <<
220 def_bool CC_IS_CLANG <<
221 # https://github.com/ClangBuiltLinux/l <<
222 depends on AS_IS_GNU || (AS_IS_LLVM && <<
223 <<
224 config GCC_SUPPORTS_DYNAMIC_FTRACE <<
225 def_bool CC_IS_GCC <<
226 depends on $(cc-option,-fpatchable-fun <<
227 <<
228 config HAVE_SHADOW_CALL_STACK <<
229 def_bool $(cc-option,-fsanitize=shadow <<
230 # https://github.com/riscv-non-isa/ris <<
231 depends on $(ld-option,--no-relax-gp) <<
232 17
233 config RISCV_USE_LINKER_RELAXATION !! 18 menu "General setup"
234 def_bool y <<
235 # https://github.com/llvm/llvm-project <<
236 depends on !LD_IS_LLD || LLD_VERSION > <<
237 19
238 # https://github.com/llvm/llvm-project/commit/ !! 20 config BBC_I2C
239 config ARCH_HAS_BROKEN_DWARF5 !! 21 tristate "UltraSPARC-III bootbus i2c controller driver"
240 def_bool y !! 22 depends on PCI
241 depends on RISCV_USE_LINKER_RELAXATION !! 23 help
242 # https://github.com/llvm/llvm-project !! 24 The BBC devices on the UltraSPARC III have two I2C controllers. The
243 depends on AS_IS_LLVM && AS_VERSION < !! 25 first I2C controller connects mainly to configuration PROMs (NVRAM,
244 # https://github.com/llvm/llvm-project !! 26 CPU configuration, DIMM types, etc.). The second I2C controller
245 depends on LD_IS_LLD && LLD_VERSION < !! 27 connects to environmental control devices such as fans and
246 !! 28 temperature sensors. The second controller also connects to the
247 config ARCH_MMAP_RND_BITS_MIN !! 29 smartcard reader, if present. Say Y to enable support for these.
248 default 18 if 64BIT !! 30
249 default 8 !! 31 config VT
250 !! 32 bool "Virtual terminal" if EMBEDDED
251 config ARCH_MMAP_RND_COMPAT_BITS_MIN !! 33 select INPUT
252 default 8 !! 34 default y
253 !! 35 ---help---
254 # max bits determined by the following formula !! 36 If you say Y here, you will get support for terminal devices with
255 # VA_BITS - PAGE_SHIFT - 3 !! 37 display and keyboard devices. These are called "virtual" because you
256 config ARCH_MMAP_RND_BITS_MAX !! 38 can run several virtual terminals (also called virtual consoles) on
257 default 24 if 64BIT # SV39 based !! 39 one physical terminal. This is rather useful, for example one
258 default 17 !! 40 virtual terminal can collect system messages and warnings, another
259 !! 41 one can be used for a text-mode user session, and a third could run
260 config ARCH_MMAP_RND_COMPAT_BITS_MAX !! 42 an X session, all in parallel. Switching between virtual terminals
261 default 17 !! 43 is done with certain key combinations, usually Alt-<function key>.
262 !! 44
263 # set if we run in machine mode, cleared if we !! 45 The setterm command ("man setterm") can be used to change the
264 config RISCV_M_MODE !! 46 properties (such as colors or beeping) of a virtual terminal. The
265 bool "Build a kernel that runs in mach !! 47 man page console_codes(4) ("man console_codes") contains the special
266 depends on !MMU !! 48 character sequences that can be used to change those properties
267 default y !! 49 directly. The fonts used on virtual terminals can be changed with
268 help !! 50 the setfont ("man setfont") command and the key bindings are defined
269 Select this option if you want to ru !! 51 with the loadkeys ("man loadkeys") command.
270 without the assistance of any other !! 52
>> 53 You need at least one virtual terminal device in order to make use
>> 54 of your keyboard and monitor. Therefore, only people configuring an
>> 55 embedded system would want to say N here in order to save some
>> 56 memory; the only way to log into such a system is then via a serial
>> 57 or network connection.
>> 58
>> 59 If unsure, say Y, or else you won't be able to do much with your new
>> 60 shiny Linux system :-)
>> 61
>> 62 config VT_CONSOLE
>> 63 bool "Support for console on virtual terminal" if EMBEDDED
>> 64 depends on VT
>> 65 default y
>> 66 ---help---
>> 67 The system console is the device which receives all kernel messages
>> 68 and warnings and which allows logins in single user mode. If you
>> 69 answer Y here, a virtual terminal (the device used to interact with
>> 70 a physical terminal) can be used as system console. This is the most
>> 71 common mode of operations, so you should say Y here unless you want
>> 72 the kernel messages be output only to a serial port (in which case
>> 73 you should say Y to "Console on serial port", below).
>> 74
>> 75 If you do say Y here, by default the currently visible virtual
>> 76 terminal (/dev/tty0) will be used as system console. You can change
>> 77 that with a kernel command line option such as "console=tty3" which
>> 78 would use the third virtual terminal as system console. (Try "man
>> 79 bootparam" or see the documentation of your boot loader (lilo or
>> 80 loadlin) about how to pass options to the kernel at boot time.)
>> 81
>> 82 If unsure, say Y.
271 83
272 # set if we are running in S-mode and can use !! 84 config HW_CONSOLE
273 config RISCV_SBI <<
274 bool 85 bool
275 depends on !RISCV_M_MODE <<
276 default y 86 default y
277 87
278 config MMU !! 88 config SMP
279 bool "MMU-based Paged Memory Managemen !! 89 bool "Symmetric multi-processing support"
280 default y !! 90 ---help---
281 help !! 91 This enables support for systems with more than one CPU. If you have
282 Select if you want MMU-based virtual !! 92 a system with only one CPU, like most personal computers, say N. If
283 support by paged memory management. !! 93 you have a system with more than one CPU, say Y.
>> 94
>> 95 If you say N here, the kernel will run on single and multiprocessor
>> 96 machines, but will use only one CPU of a multiprocessor machine. If
>> 97 you say Y here, the kernel will run on many, but not all,
>> 98 singleprocessor machines. On a singleprocessor machine, the kernel
>> 99 will run faster if you say N here.
>> 100
>> 101 Note that if you say Y here and choose architecture "586" or
>> 102 "Pentium" under "Processor family", the kernel will not work on 486
>> 103 architectures. Similarly, multiprocessor kernels for the "PPro"
>> 104 architecture may not work on all Pentium based boards.
>> 105
>> 106 People using multiprocessor machines who say Y here should also say
>> 107 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
>> 108 Management" code will be disabled if you say Y here.
>> 109
>> 110 See also the <file:Documentation/smp.tex>,
>> 111 <file:Documentation/smp.txt>, <file:Documentation/i386/IO-APIC.txt>,
>> 112 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
>> 113 <http://www.tldp.org/docs.html#howto>.
284 114
285 config PAGE_OFFSET !! 115 If you don't know what to do here, say N.
286 hex <<
287 default 0x80000000 if !MMU && RISCV_M_ <<
288 default 0x80200000 if !MMU <<
289 default 0xc0000000 if 32BIT <<
290 default 0xff60000000000000 if 64BIT <<
291 <<
292 config KASAN_SHADOW_OFFSET <<
293 hex <<
294 depends on KASAN_GENERIC <<
295 default 0xdfffffff00000000 if 64BIT <<
296 default 0xffffffff if 32BIT <<
297 116
298 config ARCH_FLATMEM_ENABLE !! 117 config PREEMPT
299 def_bool !NUMA !! 118 bool "Preemptible Kernel"
>> 119 help
>> 120 This option reduces the latency of the kernel when reacting to
>> 121 real-time or interactive events by allowing a low priority process to
>> 122 be preempted even if it is in kernel mode executing a system call.
>> 123 This allows applications to run more reliably even when the system is
>> 124 under load.
300 125
301 config ARCH_SPARSEMEM_ENABLE !! 126 Say Y here if you are building a kernel for a desktop, embedded
302 def_bool y !! 127 or real-time system. Say N if you are unsure.
303 depends on MMU <<
304 select SPARSEMEM_STATIC if 32BIT && SP <<
305 select SPARSEMEM_VMEMMAP_ENABLE if 64B <<
306 128
307 config ARCH_SELECT_MEMORY_MODEL !! 129 config NR_CPUS
308 def_bool ARCH_SPARSEMEM_ENABLE !! 130 int "Maximum number of CPUs (2-64)"
>> 131 depends on SMP
>> 132 default "64"
309 133
310 config ARCH_SUPPORTS_UPROBES !! 134 config CPU_FREQ
311 def_bool y !! 135 bool "CPU Frequency scaling"
>> 136 help
>> 137 Clock scaling allows you to change the clock speed of CPUs on the
>> 138 fly. Currently there are only sparc64 drivers for UltraSPARC-III
>> 139 and UltraSPARC-IIe processors.
312 140
313 config STACKTRACE_SUPPORT !! 141 For details, take a look at linux/Documentation/cpufreq.
314 def_bool y <<
315 142
316 config GENERIC_BUG !! 143 If in doubt, say N.
317 def_bool y <<
318 depends on BUG <<
319 select GENERIC_BUG_RELATIVE_POINTERS i <<
320 144
321 config GENERIC_BUG_RELATIVE_POINTERS !! 145 config CPU_FREQ_TABLE
322 bool !! 146 tristate "CPU frequency table helpers"
>> 147 depends on CPU_FREQ
>> 148 default y
>> 149 help
>> 150 Many CPUFreq drivers use these helpers, so only say N here if
>> 151 the CPUFreq driver of your choice doesn't need these helpers.
323 152
324 config GENERIC_CALIBRATE_DELAY !! 153 If in doubt, say Y.
325 def_bool y <<
326 154
327 config GENERIC_CSUM !! 155 config US3_FREQ
328 def_bool y !! 156 tristate "UltraSPARC-III CPU Frequency driver"
>> 157 depends on CPU_FREQ_TABLE
>> 158 help
>> 159 This adds the CPUFreq driver for UltraSPARC-III processors.
329 160
330 config GENERIC_HWEIGHT !! 161 For details, take a look at linux/Documentation/cpufreq.
331 def_bool y <<
332 162
333 config FIX_EARLYCON_MEM !! 163 If in doubt, say N.
334 def_bool MMU <<
335 164
336 config ILLEGAL_POINTER_VALUE !! 165 config US2E_FREQ
337 hex !! 166 tristate "UltraSPARC-IIe CPU Frequency driver"
338 default 0 if 32BIT !! 167 depends on CPU_FREQ_TABLE
339 default 0xdead000000000000 if 64BIT !! 168 help
340 !! 169 This adds the CPUFreq driver for UltraSPARC-IIe processors.
341 config PGTABLE_LEVELS <<
342 int <<
343 default 5 if 64BIT <<
344 default 2 <<
345 170
346 config LOCKDEP_SUPPORT !! 171 For details, take a look at linux/Documentation/cpufreq.
347 def_bool y <<
348 172
349 config RISCV_DMA_NONCOHERENT !! 173 If in doubt, say N.
350 bool !! 174
351 select ARCH_HAS_DMA_PREP_COHERENT !! 175 source "drivers/cpufreq/Kconfig"
352 select ARCH_HAS_SETUP_DMA_OPS <<
353 select ARCH_HAS_SYNC_DMA_FOR_CPU <<
354 select ARCH_HAS_SYNC_DMA_FOR_DEVICE <<
355 select DMA_BOUNCE_UNALIGNED_KMALLOC if <<
356 176
357 config RISCV_NONSTANDARD_CACHE_OPS !! 177 # Identify this as a Sparc64 build
>> 178 config SPARC64
358 bool 179 bool
>> 180 default y
359 help 181 help
360 This enables function pointer suppor !! 182 SPARC is a family of RISC microprocessors designed and marketed by
361 systems to handle cache management. !! 183 Sun Microsystems, incorporated. This port covers the newer 64-bit
>> 184 UltraSPARC. The UltraLinux project maintains both the SPARC32 and
>> 185 SPARC64 ports; its web page is available at
>> 186 <http://www.ultralinux.org/>.
362 187
363 config AS_HAS_INSN !! 188 config HOTPLUG
364 def_bool $(as-instr,.insn r 51$(comma) !! 189 bool "Support for hot-pluggable devices"
>> 190 ---help---
>> 191 Say Y here if you want to plug devices into your computer while
>> 192 the system is running, and be able to use them quickly. In many
>> 193 cases, the devices can likewise be unplugged at any time too.
365 194
366 config AS_HAS_OPTION_ARCH !! 195 One well known example of this is PCMCIA- or PC-cards, credit-card
367 # https://github.com/llvm/llvm-project !! 196 size devices such as network cards, modems or hard drives which are
368 def_bool y !! 197 plugged into slots found on all modern laptop computers. Another
369 depends on $(as-instr, .option arch$(c !! 198 example, used on modern desktops as well as laptops, is USB.
370 199
371 source "arch/riscv/Kconfig.socs" !! 200 Enable HOTPLUG and KMOD, and build a modular kernel. Get agent
372 source "arch/riscv/Kconfig.errata" !! 201 software (at <http://linux-hotplug.sourceforge.net/>) and install it.
>> 202 Then your kernel will automatically call out to a user mode "policy
>> 203 agent" (/sbin/hotplug) to load modules and set up software needed
>> 204 to use devices as you hotplug them.
373 205
374 menu "Platform type" !! 206 # Global things across all Sun machines.
>> 207 config RWSEM_GENERIC_SPINLOCK
>> 208 bool
375 209
376 config NONPORTABLE !! 210 config RWSEM_XCHGADD_ALGORITHM
377 bool "Allow configurations that result !! 211 bool
378 help !! 212 default y
379 RISC-V kernel binaries are compatibl <<
380 whenever possible, but there are som <<
381 satisfied by configurations that res <<
382 not portable between systems. <<
383 213
384 Selecting N does not guarantee kerne !! 214 choice
385 systems. Selecting any of the optio !! 215 prompt "SPARC64 Huge TLB Page Size"
386 result in kernel binaries that are u !! 216 depends on HUGETLB_PAGE
387 systems. !! 217 default HUGETLB_PAGE_SIZE_4MB
388 218
389 If unsure, say N. !! 219 config HUGETLB_PAGE_SIZE_4MB
>> 220 bool "4MB"
390 221
391 choice !! 222 config HUGETLB_PAGE_SIZE_512K
392 prompt "Base ISA" !! 223 bool "512K"
393 default ARCH_RV64I <<
394 help <<
395 This selects the base ISA that this <<
396 the target platform. <<
397 224
398 config ARCH_RV32I !! 225 config HUGETLB_PAGE_SIZE_64K
399 bool "RV32I" !! 226 bool "64K"
400 depends on NONPORTABLE <<
401 select 32BIT <<
402 select GENERIC_LIB_ASHLDI3 <<
403 select GENERIC_LIB_ASHRDI3 <<
404 select GENERIC_LIB_LSHRDI3 <<
405 select GENERIC_LIB_UCMPDI2 <<
406 <<
407 config ARCH_RV64I <<
408 bool "RV64I" <<
409 select 64BIT <<
410 select ARCH_SUPPORTS_INT128 if CC_HAS_ <<
411 select SWIOTLB if MMU <<
412 227
413 endchoice 228 endchoice
414 229
415 # We must be able to map all physical memory i !! 230 config GENERIC_ISA_DMA
416 # is still a bit more efficient when generatin !! 231 bool
417 # such that it can only map 2GiB of memory. !! 232 default y
418 choice <<
419 prompt "Kernel Code Model" <<
420 default CMODEL_MEDLOW if 32BIT <<
421 default CMODEL_MEDANY if 64BIT <<
422 <<
423 config CMODEL_MEDLOW <<
424 bool "medium low code model" <<
425 config CMODEL_MEDANY <<
426 bool "medium any code model" <<
427 endchoice <<
428 233
429 config MODULE_SECTIONS !! 234 config ISA
430 bool 235 bool
431 select HAVE_MOD_ARCH_SPECIFIC !! 236 help
>> 237 Find out whether you have ISA slots on your motherboard. ISA is the
>> 238 name of a bus system, i.e. the way the CPU talks to the other stuff
>> 239 inside your box. Other bus systems are PCI, EISA, MicroChannel
>> 240 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
>> 241 newer boards don't support it. If you have ISA, say Y, otherwise N.
432 242
433 config SMP !! 243 config ISAPNP
434 bool "Symmetric Multi-Processing" !! 244 bool
435 help 245 help
436 This enables support for systems wit !! 246 Say Y here if you would like support for ISA Plug and Play devices.
437 you say N here, the kernel will run !! 247 Some information is in <file:Documentation/isapnp.txt>.
438 multiprocessor machines, but will us <<
439 multiprocessor machine. If you say Y <<
440 on many, but not all, single process <<
441 processor machine, the kernel will r <<
442 here. <<
443 248
444 If you don't know what to do here, s !! 249 To compile this driver as a module, choose M here: the
>> 250 module will be called isapnp.
445 251
446 config SCHED_MC !! 252 If unsure, say Y.
447 bool "Multi-core scheduler support" <<
448 depends on SMP <<
449 help <<
450 Multi-core scheduler support improve <<
451 making when dealing with multi-core <<
452 increased overhead in some places. I <<
453 253
454 config NR_CPUS !! 254 config EISA
455 int "Maximum number of CPUs (2-512)" !! 255 bool
456 depends on SMP !! 256 ---help---
457 range 2 512 if !RISCV_SBI_V01 !! 257 The Extended Industry Standard Architecture (EISA) bus was
458 range 2 32 if RISCV_SBI_V01 && 32BIT !! 258 developed as an open alternative to the IBM MicroChannel bus.
459 range 2 64 if RISCV_SBI_V01 && 64BIT <<
460 default "32" if 32BIT <<
461 default "64" if 64BIT <<
462 259
463 config HOTPLUG_CPU !! 260 The EISA bus provided some of the features of the IBM MicroChannel
464 bool "Support for hot-pluggable CPUs" !! 261 bus while maintaining backward compatibility with cards made for
465 depends on SMP !! 262 the older ISA bus. The EISA bus saw limited use between 1988 and
466 select GENERIC_IRQ_MIGRATION !! 263 1995 when it was made obsolete by the PCI bus.
467 help <<
468 264
469 Say Y here to experiment with turnin !! 265 Say Y here if you are building a kernel for an EISA-based machine.
470 can be controlled through /sys/devic <<
471 266
472 Say N if you want to disable CPU hot !! 267 Otherwise, say N.
473 268
474 choice !! 269 config MCA
475 prompt "CPU Tuning" !! 270 bool
476 default TUNE_GENERIC !! 271 help
>> 272 MicroChannel Architecture is found in some IBM PS/2 machines and
>> 273 laptops. It is a bus system similar to PCI or ISA. See
>> 274 <file:Documentation/mca.txt> (and especially the web page given
>> 275 there) before attempting to build an MCA bus kernel.
477 276
478 config TUNE_GENERIC !! 277 config PCMCIA
479 bool "generic" !! 278 tristate
>> 279 ---help---
>> 280 Say Y here if you want to attach PCMCIA- or PC-cards to your Linux
>> 281 computer. These are credit-card size devices such as network cards,
>> 282 modems or hard drives often used with laptops computers. There are
>> 283 actually two varieties of these cards: the older 16 bit PCMCIA cards
>> 284 and the newer 32 bit CardBus cards. If you want to use CardBus
>> 285 cards, you need to say Y here and also to "CardBus support" below.
480 286
481 endchoice !! 287 To use your PC-cards, you will need supporting software from David
>> 288 Hinds' pcmcia-cs package (see the file <file:Documentation/Changes>
>> 289 for location). Please also read the PCMCIA-HOWTO, available from
>> 290 <http://www.tldp.org/docs.html#howto>.
482 291
483 # Common NUMA Features !! 292 To compile this driver as modules, choose M here: the
484 config NUMA !! 293 modules will be called pcmcia_core and ds.
485 bool "NUMA Memory Allocation and Sched <<
486 depends on SMP && MMU <<
487 select ARCH_SUPPORTS_NUMA_BALANCING <<
488 select GENERIC_ARCH_NUMA <<
489 select HAVE_SETUP_PER_CPU_AREA <<
490 select NEED_PER_CPU_EMBED_FIRST_CHUNK <<
491 select NEED_PER_CPU_PAGE_FIRST_CHUNK <<
492 select OF_NUMA <<
493 select USE_PERCPU_NUMA_NODE_ID <<
494 help <<
495 Enable NUMA (Non-Uniform Memory Acce <<
496 <<
497 The kernel will try to allocate memo <<
498 local memory of the CPU and add some <<
499 <<
500 config NODES_SHIFT <<
501 int "Maximum NUMA Nodes (as a power of <<
502 range 1 10 <<
503 default "2" <<
504 depends on NUMA <<
505 help <<
506 Specify the maximum number of NUMA N <<
507 system. Increases memory reserved t <<
508 294
509 config RISCV_ALTERNATIVE !! 295 config SBUS
510 bool 296 bool
511 depends on !XIP_KERNEL !! 297 default y
512 help <<
513 This Kconfig allows the kernel to au <<
514 erratum or cpufeature required by th <<
515 time. The code patching overhead is <<
516 once at boot and once on each module <<
517 298
518 config RISCV_ALTERNATIVE_EARLY !! 299 config SBUSCHAR
519 bool 300 bool
520 depends on RISCV_ALTERNATIVE !! 301 default y
521 help <<
522 Allows early patching of the kernel <<
523 302
524 config RISCV_ISA_C !! 303 config SUN_AUXIO
525 bool "Emit compressed instructions whe !! 304 bool
526 default y 305 default y
527 help !! 306
528 Adds "C" to the ISA subsets that the !! 307 config SUN_IO
529 when building Linux, which results i !! 308 bool
530 Linux binary. <<
531 <<
532 If you don't know what to do here, s <<
533 <<
534 config RISCV_ISA_SVNAPOT <<
535 bool "Svnapot extension support for su <<
536 depends on 64BIT && MMU <<
537 depends on RISCV_ALTERNATIVE <<
538 default y 309 default y
>> 310
>> 311 config PCI
>> 312 bool "PCI support"
539 help 313 help
540 Allow kernel to detect the Svnapot I !! 314 Find out whether you have a PCI motherboard. PCI is the name of a
541 time and enable its usage. !! 315 bus system, i.e. the way the CPU talks to the other stuff inside
>> 316 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
>> 317 VESA. If you have PCI, say Y, otherwise N.
542 318
543 The Svnapot extension is used to mar !! 319 The PCI-HOWTO, available from
544 of contiguous virtual-to-physical tr !! 320 <http://www.tldp.org/docs.html#howto>, contains valuable
545 aligned power-of-2 (NAPOT) granulari !! 321 information about which PCI hardware does work under Linux and which
546 size. When HUGETLBFS is also selecte !! 322 doesn't.
547 allocates some memory for each NAPOT !! 323
548 When optimizing for low memory consu !! 324 config PCI_DOMAINS
549 the Svnapot extension, it may be bet !! 325 bool
550 !! 326 default PCI
551 If you don't know what to do here, s !! 327
552 !! 328 config RTC
553 config RISCV_ISA_SVPBMT !! 329 tristate
554 bool "Svpbmt extension support for sup !! 330 depends on PCI
555 depends on 64BIT && MMU <<
556 depends on RISCV_ALTERNATIVE <<
557 default y 331 default y
558 help !! 332 ---help---
559 Adds support to dynamically detect !! 333 If you say Y here and create a character special file /dev/rtc with
560 ISA-extension (Supervisor-mode: pag !! 334 major number 10 and minor number 135 using mknod ("man mknod"), you
561 enable its usage. !! 335 will get access to the real time clock (or hardware clock) built
>> 336 into your computer.
562 337
563 The memory type for a page contains !! 338 Every PC has such a clock built in. It can be used to generate
564 that indicate the cacheability, ide !! 339 signals from as low as 1Hz up to 8192Hz, and can also be used
565 properties for access to that page. !! 340 as a 24 hour alarm. It reports status information via the file
>> 341 /proc/driver/rtc and its behaviour is set by various ioctls on
>> 342 /dev/rtc.
566 343
567 The Svpbmt extension is only availa !! 344 If you run Linux on a multiprocessor machine and said Y to
>> 345 "Symmetric Multi Processing" above, you should say Y here to read
>> 346 and set the RTC in an SMP compatible fashion.
568 347
569 If you don't know what to do here, !! 348 If you think you have a use for such a device (such as periodic data
>> 349 sampling), then say Y here, and read <file:Documentation/rtc.txt>
>> 350 for details.
570 351
571 config TOOLCHAIN_HAS_V !! 352 To compile this driver as a module, choose M here: the
572 bool !! 353 module will be called rtc.
573 default y <<
574 depends on !64BIT || $(cc-option,-mabi <<
575 depends on !32BIT || $(cc-option,-mabi <<
576 depends on LLD_VERSION >= 140000 || LD <<
577 depends on AS_HAS_OPTION_ARCH <<
578 <<
579 config RISCV_ISA_V <<
580 bool "VECTOR extension support" <<
581 depends on TOOLCHAIN_HAS_V <<
582 depends on FPU <<
583 select DYNAMIC_SIGFRAME <<
584 default y <<
585 help <<
586 Say N here if you want to disable al <<
587 in the kernel. <<
588 354
589 If you don't know what to do here, s !! 355 source "drivers/pci/Kconfig"
590 356
591 config RISCV_ISA_V_DEFAULT_ENABLE !! 357 config SUN_OPENPROMFS
592 bool "Enable userspace Vector by defau !! 358 tristate "Openprom tree appears in /proc/openprom"
593 depends on RISCV_ISA_V <<
594 default y <<
595 help 359 help
596 Say Y here if you want to enable Vec !! 360 If you say Y, the OpenPROM device tree will be available as a
597 Otherwise, userspace has to make exp !! 361 virtual file system, which you can mount to /proc/openprom by "mount
598 Vector, or enable it via the sysctl !! 362 -t openpromfs none /proc/openprom".
599 !! 363
600 If you don't know what to do here, s !! 364 To compile the /proc/openprom support as a module, choose M here: the
601 !! 365 module will be called openpromfs. If unsure, choose M.
602 config RISCV_ISA_V_UCOPY_THRESHOLD <<
603 int "Threshold size for vectorized use <<
604 depends on RISCV_ISA_V <<
605 default 768 <<
606 help <<
607 Prefer using vectorized copy_to_user <<
608 workload size exceeds this value. <<
609 <<
610 config RISCV_ISA_V_PREEMPTIVE <<
611 bool "Run kernel-mode Vector with kern <<
612 depends on PREEMPTION <<
613 depends on RISCV_ISA_V <<
614 default y <<
615 help <<
616 Usually, in-kernel SIMD routines are <<
617 Functions which envoke long running <<
618 vector unit to prevent blocking othe <<
619 <<
620 This config allows kernel to run SIM <<
621 preemption. Enabling this config wil <<
622 consumption due to the allocation of <<
623 <<
624 config RISCV_ISA_ZAWRS <<
625 bool "Zawrs extension support for more <<
626 depends on RISCV_ALTERNATIVE <<
627 default y <<
628 help <<
629 The Zawrs extension defines instruct <<
630 which allow a hart to enter a low-po <<
631 hypervisor while waiting on a store <<
632 use of these instructions in the ker <<
633 detected at boot. <<
634 366
635 If you don't know what to do here, s !! 367 config SPARC32_COMPAT
>> 368 bool "Kernel support for Linux/Sparc 32bit binary compatibility"
>> 369 help
>> 370 This allows you to run 32-bit binaries on your Ultra.
>> 371 Everybody wants this; say Y.
636 372
637 config TOOLCHAIN_HAS_ZBB !! 373 config COMPAT
638 bool 374 bool
>> 375 depends on SPARC32_COMPAT
639 default y 376 default y
640 depends on !64BIT || $(cc-option,-mabi <<
641 depends on !32BIT || $(cc-option,-mabi <<
642 depends on LLD_VERSION >= 150000 || LD <<
643 depends on AS_HAS_OPTION_ARCH <<
644 <<
645 # This symbol indicates that the toolchain sup <<
646 # extensions, including Zvk*, Zvbb, and Zvbc. <<
647 # binutils added all except Zvkb, then added Z <<
648 config TOOLCHAIN_HAS_VECTOR_CRYPTO <<
649 def_bool $(as-instr, .option arch$(com <<
650 depends on AS_HAS_OPTION_ARCH <<
651 377
652 config RISCV_ISA_ZBA !! 378 config UID16
653 bool "Zba extension support for bit ma !! 379 bool
>> 380 depends on SPARC32_COMPAT
654 default y 381 default y
655 help <<
656 Add support for enabling optimisati <<
657 extension is detected at boot. <<
658 382
659 The Zba extension provides instruct !! 383 config BINFMT_ELF32
660 of addresses that index into arrays !! 384 tristate "Kernel support for 32-bit ELF binaries"
>> 385 depends on SPARC32_COMPAT
>> 386 help
>> 387 This allows you to run 32-bit Linux/ELF binaries on your Ultra.
>> 388 Everybody wants this; say Y.
>> 389
>> 390 config BINFMT_AOUT32
>> 391 bool "Kernel support for 32-bit (ie. SunOS) a.out binaries"
>> 392 depends on SPARC32_COMPAT
>> 393 help
>> 394 This allows you to run 32-bit a.out format binaries on your Ultra.
>> 395 If you want to run SunOS binaries (see SunOS binary emulation below)
>> 396 or other a.out binaries, say Y. If unsure, say N.
>> 397
>> 398 source "fs/Kconfig.binfmt"
>> 399
>> 400 config SUNOS_EMUL
>> 401 bool "SunOS binary emulation"
>> 402 help
>> 403 This allows you to run most SunOS binaries. If you want to do this,
>> 404 say Y here and place appropriate files in /usr/gnemul/sunos. See
>> 405 <http://www.ultralinux.org/faq.html> for more information. If you
>> 406 want to run SunOS binaries on an Ultra you must also say Y to
>> 407 "Kernel support for 32-bit a.out binaries" above.
>> 408
>> 409 config SOLARIS_EMUL
>> 410 tristate "Solaris binary emulation (EXPERIMENTAL)"
>> 411 depends on EXPERIMENTAL
>> 412 help
>> 413 This is experimental code which will enable you to run (many)
>> 414 Solaris binaries on your SPARC Linux machine.
>> 415
>> 416 To compile this code as a module, choose M here: the
>> 417 module will be called solaris.
>> 418
>> 419 source "drivers/parport/Kconfig"
>> 420
>> 421 config PRINTER
>> 422 tristate "Parallel printer support"
>> 423 depends on PARPORT
>> 424 ---help---
>> 425 If you intend to attach a printer to the parallel port of your Linux
>> 426 box (as opposed to using a serial printer; if the connector at the
>> 427 printer has 9 or 25 holes ["female"], then it's serial), say Y.
>> 428 Also read the Printing-HOWTO, available from
>> 429 <http://www.tldp.org/docs.html#howto>.
>> 430
>> 431 It is possible to share one parallel port among several devices
>> 432 (e.g. printer and ZIP drive) and it is safe to compile the
>> 433 corresponding drivers into the kernel.
>> 434 To compile this driver as a module, choose M here and read
>> 435 <file:Documentation/parport.txt>. The module will be called lp.
>> 436
>> 437 If you have several parallel ports, you can specify which ports to
>> 438 use with the "lp" kernel command line option. (Try "man bootparam"
>> 439 or see the documentation of your boot loader (lilo or loadlin) about
>> 440 how to pass options to the kernel at boot time.) The syntax of the
>> 441 "lp" command line option can be found in <file:drivers/char/lp.c>.
>> 442
>> 443 If you have more than 8 printers, you need to increase the LP_NO
>> 444 macro in lp.c and the PARPORT_MAX macro in parport.h.
>> 445
>> 446 config ENVCTRL
>> 447 tristate "SUNW, envctrl support"
>> 448 depends on PCI
>> 449 help
>> 450 Kernel support for temperature and fan monitoring on Sun SME
>> 451 machines.
>> 452
>> 453 To compile this driver as a module, choose M here: the
>> 454 module will be called envctrl.
>> 455
>> 456 config DISPLAY7SEG
>> 457 tristate "7-Segment Display support"
>> 458 depends on PCI
>> 459 ---help---
>> 460 This is the driver for the 7-segment display and LED present on
>> 461 Sun Microsystems CompactPCI models CP1400 and CP1500.
>> 462
>> 463 To compile this driver as a module, choose M here: the
>> 464 module will be called display7seg.
>> 465
>> 466 If you do not have a CompactPCI model CP1400 or CP1500, or
>> 467 another UltraSPARC-IIi-cEngine boardset with a 7-segment display,
>> 468 you should say N to this option.
>> 469
>> 470 config WATCHDOG_CP1XXX
>> 471 tristate "CP1XXX Hardware Watchdog support"
>> 472 depends on PCI
>> 473 ---help---
>> 474 This is the driver for the hardware watchdog timers present on
>> 475 Sun Microsystems CompactPCI models CP1400 and CP1500.
>> 476
>> 477 To compile this driver as a module, choose M here: the
>> 478 module will be called cpwatchdog.
>> 479
>> 480 If you do not have a CompactPCI model CP1400 or CP1500, or
>> 481 another UltraSPARC-IIi-cEngine boardset with hardware watchdog,
>> 482 you should say N to this option.
>> 483
>> 484 config WATCHDOG_RIO
>> 485 tristate "RIO Hardware Watchdog support"
>> 486 depends on PCI
>> 487 help
>> 488 Say Y here to support the hardware watchdog capability on Sun RIO
>> 489 machines. The watchdog timeout period is normally one minute but
>> 490 can be changed with a boot-time parameter.
>> 491
>> 492 endmenu
>> 493
>> 494 source "drivers/base/Kconfig"
>> 495
>> 496 source "drivers/video/Kconfig"
>> 497
>> 498 source "drivers/serial/Kconfig"
>> 499
>> 500 source "drivers/sbus/char/Kconfig"
>> 501
>> 502 source "drivers/mtd/Kconfig"
>> 503
>> 504
>> 505 menu "Block devices"
>> 506
>> 507 config BLK_DEV_FD
>> 508 bool "Normal floppy disk support"
>> 509 ---help---
>> 510 If you want to use the floppy disk drive(s) of your PC under Linux,
>> 511 say Y. Information about this driver, especially important for IBM
>> 512 Thinkpad users, is contained in <file:Documentation/floppy.txt>.
>> 513 That file also contains the location of the Floppy driver FAQ as
>> 514 well as location of the fdutils package used to configure additional
>> 515 parameters of the driver at run time.
>> 516
>> 517 To compile this driver as a module, choose M here: the
>> 518 module will be called floppy.
>> 519
>> 520 config BLK_DEV_LOOP
>> 521 tristate "Loopback device support"
>> 522 ---help---
>> 523 Saying Y here will allow you to use a regular file as a block
>> 524 device; you can then create a file system on that block device and
>> 525 mount it just as you would mount other block devices such as hard
>> 526 drive partitions, CD-ROM drives or floppy drives. The loop devices
>> 527 are block special device files with major number 7 and typically
>> 528 called /dev/loop0, /dev/loop1 etc.
>> 529
>> 530 This is useful if you want to check an ISO 9660 file system before
>> 531 burning the CD, or if you want to use floppy images without first
>> 532 writing them to floppy. Furthermore, some Linux distributions avoid
>> 533 the need for a dedicated Linux partition by keeping their complete
>> 534 root file system inside a DOS FAT file using this loop device
>> 535 driver.
>> 536
>> 537 The loop device driver can also be used to "hide" a file system in a
>> 538 disk partition, floppy, or regular file, either using encryption
>> 539 (scrambling the data) or steganography (hiding the data in the low
>> 540 bits of, say, a sound file). This is also safe if the file resides
>> 541 on a remote file server. If you want to do this, you will first have
>> 542 to acquire and install a kernel patch from
>> 543 <ftp://ftp.kerneli.org/pub/kerneli/>, and then you need to
>> 544 say Y to this option.
>> 545
>> 546 Note that alternative ways to use encrypted file systems are
>> 547 provided by the cfs package, which can be gotten from
>> 548 <ftp://ftp.kerneli.org/pub/kerneli/net-source/>, and the newer tcfs
>> 549 package, available at <http://tcfs.dia.unisa.it/>. You do not need
>> 550 to say Y here if you want to use one of these. However, using cfs
>> 551 requires saying Y to "NFS file system support" below while using
>> 552 tcfs requires applying a kernel patch. An alternative steganography
>> 553 solution is provided by StegFS, also available from
>> 554 <ftp://ftp.kerneli.org/pub/kerneli/net-source/>.
>> 555
>> 556 To use the loop device, you need the losetup utility and a recent
>> 557 version of the mount program, both contained in the util-linux
>> 558 package. The location and current version number of util-linux is
>> 559 contained in the file <file:Documentation/Changes>.
>> 560
>> 561 Note that this loop device has nothing to do with the loopback
>> 562 device used for network connections from the machine to itself.
>> 563
>> 564 To compile this driver as a module, choose M here: the
>> 565 module will be called loop.
>> 566
>> 567 Most users will answer N here.
>> 568
>> 569 config BLK_DEV_NBD
>> 570 tristate "Network block device support"
>> 571 depends on NET
>> 572 ---help---
>> 573 Saying Y here will allow your computer to be a client for network
>> 574 block devices, i.e. it will be able to use block devices exported by
>> 575 servers (mount file systems on them etc.). Communication between
>> 576 client and server works over TCP/IP networking, but to the client
>> 577 program this is hidden: it looks like a regular local file access to
>> 578 a block device special file such as /dev/nd0.
>> 579
>> 580 Network block devices also allows you to run a block-device in
>> 581 userland (making server and client physically the same computer,
>> 582 communicating using the loopback network device).
>> 583
>> 584 Read <file:Documentation/nbd.txt> for more information, especially
>> 585 about where to find the server code, which runs in user space and
>> 586 does not need special kernel support.
661 587
662 If you don't know what to do here, !! 588 Note that this has nothing to do with the network file systems NFS
>> 589 or Coda; you can say N here even if you intend to use NFS or Coda.
663 590
664 config RISCV_ISA_ZBB !! 591 To compile this driver as a module, choose M here: the
665 bool "Zbb extension support for bit ma !! 592 module will be called nbd.
666 depends on TOOLCHAIN_HAS_ZBB <<
667 depends on RISCV_ALTERNATIVE <<
668 default y <<
669 help <<
670 Adds support to dynamically detect <<
671 extension (basic bit manipulation) <<
672 593
673 The Zbb extension provides instruct !! 594 If unsure, say N.
674 of bit-specific operations (count b <<
675 bitrotation, etc). <<
676 595
677 If you don't know what to do here, !! 596 source "drivers/md/Kconfig"
678 597
679 config TOOLCHAIN_HAS_ZBC !! 598 config BLK_DEV_RAM
680 bool !! 599 tristate "RAM disk support"
681 default y !! 600 ---help---
682 depends on !64BIT || $(cc-option,-mabi !! 601 Saying Y here will allow you to use a portion of your RAM memory as
683 depends on !32BIT || $(cc-option,-mabi !! 602 a block device, so that you can make file systems on it, read and
684 depends on LLD_VERSION >= 150000 || LD !! 603 write to it and do all the other things that you can do with normal
685 depends on AS_HAS_OPTION_ARCH !! 604 block devices (such as hard drives). It is usually used to load and
686 !! 605 store a copy of a minimal root file system off of a floppy into RAM
687 config RISCV_ISA_ZBC !! 606 during the initial install of Linux.
688 bool "Zbc extension support for carry- <<
689 depends on TOOLCHAIN_HAS_ZBC <<
690 depends on MMU <<
691 depends on RISCV_ALTERNATIVE <<
692 default y <<
693 help <<
694 Adds support to dynamically detect <<
695 extension (carry-less multiplicatio <<
696 607
697 The Zbc extension could accelerate !! 608 Note that the kernel command line option "ramdisk=XX" is now
698 calculations. !! 609 obsolete. For details, read <file:Documentation/ramdisk.txt>.
699 610
700 If you don't know what to do here, !! 611 To compile this driver as a module, choose M here: the
>> 612 module will be called rd.
701 613
702 config RISCV_ISA_ZICBOM !! 614 Most normal users won't need the RAM disk functionality, and can
703 bool "Zicbom extension support for non !! 615 thus say N here.
704 depends on MMU <<
705 depends on RISCV_ALTERNATIVE <<
706 default y <<
707 select RISCV_DMA_NONCOHERENT <<
708 select DMA_DIRECT_REMAP <<
709 help <<
710 Adds support to dynamically detect <<
711 extension (Cache Block Management O <<
712 usage. <<
713 616
714 The Zicbom extension can be used to !! 617 config BLK_DEV_RAM_SIZE
715 non-coherent DMA support on devices !! 618 int "Default RAM disk size"
716 !! 619 depends on BLK_DEV_RAM
717 If you don't know what to do here, !! 620 default "4096"
>> 621 help
>> 622 The default value is 4096. Only change this if you know what are
>> 623 you doing. If you are using IBM S/390, then set this to 8192.
718 624
719 config RISCV_ISA_ZICBOZ !! 625 config BLK_DEV_INITRD
720 bool "Zicboz extension support for fas !! 626 bool "Initial RAM disk (initrd) support"
721 depends on RISCV_ALTERNATIVE !! 627 depends on BLK_DEV_RAM=y
722 default y <<
723 help 628 help
724 Enable the use of the Zicboz extens !! 629 The initial RAM disk is a RAM disk that is loaded by the boot loader
725 when available. !! 630 (loadlin or lilo) and that is mounted as root before the normal boot
>> 631 procedure. It is typically used to load modules needed to mount the
>> 632 "real" root file system, etc. See <file:Documentation/initrd.txt>
>> 633 for details.
726 634
727 The Zicboz extension is used for fa !! 635 endmenu
728 636
729 If you don't know what to do here, <<
730 637
731 config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI !! 638 source "drivers/ide/Kconfig"
732 def_bool y <<
733 # https://sourceware.org/git/?p=binuti <<
734 # https://gcc.gnu.org/git/?p=gcc.git;a <<
735 depends on AS_IS_GNU && AS_VERSION >= <<
736 help <<
737 Binutils-2.38 and GCC-12.1.0 bumped <<
738 20191213 version, which moves some i <<
739 the Zicsr and Zifencei extensions. T <<
740 Zicsr and Zifencei when binutils >= <<
741 and Zifencei are supported in binuti <<
742 To make life easier, and avoid forci <<
743 newer ISA spec to version 2.2, relax <<
744 For clang < 17 or GCC < 11.3.0, for <<
745 special treatment, this is dealt wit <<
746 639
747 config TOOLCHAIN_NEEDS_OLD_ISA_SPEC !! 640 source "drivers/scsi/Kconfig"
748 def_bool y <<
749 depends on TOOLCHAIN_NEEDS_EXPLICIT_ZI <<
750 # https://github.com/llvm/llvm-project <<
751 # https://gcc.gnu.org/git/?p=gcc.git;a <<
752 depends on (CC_IS_CLANG && CLANG_VERSI <<
753 help <<
754 Certain versions of clang and GCC do <<
755 -march. This option causes an older <<
756 versions of clang and GCC to be pass <<
757 as passing zicsr and zifencei to -ma <<
758 641
759 config FPU !! 642 source "drivers/fc4/Kconfig"
760 bool "FPU support" <<
761 default y <<
762 help <<
763 Say N here if you want to disable al <<
764 in the kernel. <<
765 643
766 If you don't know what to do here, s !! 644 if PCI
>> 645 source "drivers/message/fusion/Kconfig"
>> 646 endif
767 647
768 config IRQ_STACKS !! 648 source "drivers/ieee1394/Kconfig"
769 bool "Independent irq & softirq stacks <<
770 default y <<
771 select HAVE_IRQ_EXIT_ON_IRQ_STACK <<
772 select HAVE_SOFTIRQ_ON_OWN_STACK <<
773 help <<
774 Add independent irq & softirq stacks <<
775 overflows. We may save some memory f <<
776 649
777 config THREAD_SIZE_ORDER !! 650 source "net/Kconfig"
778 int "Kernel stack size (in power-of-tw <<
779 range 0 4 <<
780 default 1 if 32BIT <<
781 default 2 <<
782 help <<
783 Specify the Pages of thread stack si <<
784 affects irq stack size, which is equ <<
785 651
786 config RISCV_MISALIGNED !! 652 source "drivers/isdn/Kconfig"
787 bool <<
788 select SYSCTL_ARCH_UNALIGN_ALLOW <<
789 help <<
790 Embed support for emulating misalign <<
791 653
792 choice !! 654 source "drivers/telephony/Kconfig"
793 prompt "Unaligned Accesses Support" <<
794 default RISCV_PROBE_UNALIGNED_ACCESS <<
795 help <<
796 This determines the level of support <<
797 information is used by the kernel to <<
798 exposed to user space via the hwprob <<
799 probed at boot by default. <<
800 <<
801 config RISCV_PROBE_UNALIGNED_ACCESS <<
802 bool "Probe for hardware unaligned acc <<
803 select RISCV_MISALIGNED <<
804 help <<
805 During boot, the kernel will run a s <<
806 speed of unaligned accesses. This pr <<
807 the speed of unaligned accesses on t <<
808 memory accesses trap into the kernel <<
809 system, the kernel will emulate the <<
810 UABI. <<
811 <<
812 config RISCV_EMULATED_UNALIGNED_ACCESS <<
813 bool "Emulate unaligned access where s <<
814 select RISCV_MISALIGNED <<
815 help <<
816 If unaligned memory accesses trap in <<
817 supported by the system, the kernel <<
818 accesses to preserve the UABI. When <<
819 unaligned accesses, the unaligned ac <<
820 <<
821 config RISCV_SLOW_UNALIGNED_ACCESS <<
822 bool "Assume the system supports slow <<
823 depends on NONPORTABLE <<
824 help <<
825 Assume that the system supports slow <<
826 kernel and userspace programs may no <<
827 that do not support unaligned memory <<
828 <<
829 config RISCV_EFFICIENT_UNALIGNED_ACCESS <<
830 bool "Assume the system supports fast <<
831 depends on NONPORTABLE <<
832 select DCACHE_WORD_ACCESS if MMU <<
833 select HAVE_EFFICIENT_UNALIGNED_ACCESS <<
834 help <<
835 Assume that the system supports fast <<
836 enabled, this option improves the pe <<
837 systems. However, the kernel and use <<
838 slowly, or will not be able to run a <<
839 support efficient unaligned memory a <<
840 655
841 endchoice !! 656 # This one must be before the filesystem configs. -DaveM
842 657
843 source "arch/riscv/Kconfig.vendor" !! 658 menu "Unix 98 PTY support"
844 659
845 endmenu # "Platform type" !! 660 config UNIX98_PTYS
>> 661 bool "Unix98 PTY support"
>> 662 ---help---
>> 663 A pseudo terminal (PTY) is a software device consisting of two
>> 664 halves: a master and a slave. The slave device behaves identical to
>> 665 a physical terminal; the master device is used by a process to
>> 666 read data from and write data to the slave, thereby emulating a
>> 667 terminal. Typical programs for the master side are telnet servers
>> 668 and xterms.
846 669
847 menu "Kernel features" !! 670 Linux has traditionally used the BSD-like names /dev/ptyxx for
>> 671 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
>> 672 has a number of problems. The GNU C library glibc 2.1 and later,
>> 673 however, supports the Unix98 naming standard: in order to acquire a
>> 674 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
>> 675 terminal is then made available to the process and the pseudo
>> 676 terminal slave can be accessed as /dev/pts/<number>. What was
>> 677 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
848 678
849 source "kernel/Kconfig.hz" !! 679 The entries in /dev/pts/ are created on the fly by a virtual
>> 680 file system; therefore, if you say Y here you should say Y to
>> 681 "/dev/pts file system for Unix98 PTYs" as well.
850 682
851 config RISCV_SBI_V01 !! 683 If you want to say Y here, you need to have the C library glibc 2.1
852 bool "SBI v0.1 support" !! 684 or later (equal to libc-6.1, check with "ls -l /lib/libc.so.*").
853 depends on RISCV_SBI !! 685 Read the instructions in <file:Documentation/Changes> pertaining to
854 help !! 686 pseudo terminals. It's safe to say N.
855 This config allows kernel to use SBI <<
856 deprecated in future once legacy M-m <<
857 687
858 config RISCV_BOOT_SPINWAIT !! 688 config UNIX98_PTY_COUNT
859 bool "Spinwait booting method" !! 689 int "Maximum number of Unix98 PTYs in use (0-2048)"
860 depends on SMP !! 690 depends on UNIX98_PTYS
861 default y if RISCV_SBI_V01 || RISCV_M_ !! 691 default "256"
862 help 692 help
863 This enables support for booting Lin !! 693 The maximum number of Unix98 PTYs that can be used at any one time.
864 spinwait method, all cores randomly !! 694 The default is 256, and should be enough for desktop systems. Server
865 gets chosen via lottery and all othe !! 695 machines which support incoming telnet/rlogin/ssh connections and/or
866 variable. This method cannot support !! 696 serve several X terminals may want to increase this: every incoming
867 scheme. It should be only enabled fo !! 697 connection and every xterm uses up one PTY.
868 on older firmware without SBI HSM ex <<
869 rely on ordered booting via SBI HSM <<
870 dynamically at runtime if the firmwa <<
871 <<
872 Since spinwait is incompatible with <<
873 NR_CPUS be large enough to contain t <<
874 hart to enter Linux. <<
875 698
876 If unsure what to do here, say N. !! 699 When not in use, each additional set of 256 PTYs occupy
>> 700 approximately 8 KB of kernel memory on 32-bit architectures.
877 701
878 config ARCH_SUPPORTS_KEXEC !! 702 endmenu
879 def_bool y <<
880 703
881 config ARCH_SELECTS_KEXEC <<
882 def_bool y <<
883 depends on KEXEC <<
884 select HOTPLUG_CPU if SMP <<
885 704
886 config ARCH_SUPPORTS_KEXEC_FILE !! 705 menu "XFree86 DRI support"
887 def_bool 64BIT <<
888 706
889 config ARCH_SELECTS_KEXEC_FILE !! 707 config DRM
890 def_bool y !! 708 bool "Direct Rendering Manager (XFree86 DRI support)"
891 depends on KEXEC_FILE !! 709 help
892 select HAVE_IMA_KEXEC if IMA !! 710 Kernel-level support for the Direct Rendering Infrastructure (DRI)
893 select KEXEC_ELF !! 711 introduced in XFree86 4.0. If you say Y here, you need to select
>> 712 the module that's right for your graphics card from the list below.
>> 713 These modules provide support for synchronization, security, and
>> 714 DMA transfers. Please see <http://dri.sourceforge.net/> for more
>> 715 details. You should also select and configure AGP
>> 716 (/dev/agpgart) support.
894 717
895 config ARCH_SUPPORTS_KEXEC_PURGATORY !! 718 config DRM_FFB
896 def_bool ARCH_SUPPORTS_KEXEC_FILE !! 719 tristate "Creator/Creator3D"
>> 720 depends on DRM
>> 721 help
>> 722 Choose this option if you have one of Sun's Creator3D-based graphics
>> 723 and frame buffer cards. Product page at
>> 724 <http://www.sun.com/desktop/products/Graphics/creator3d.html>.
897 725
898 config ARCH_SUPPORTS_CRASH_DUMP !! 726 config DRM_TDFX
899 def_bool y !! 727 tristate "3dfx Banshee/Voodoo3+"
>> 728 depends on DRM
>> 729 help
>> 730 Choose this option if you have a 3dfx Banshee or Voodoo3 (or later),
>> 731 graphics card. If M is selected, the module will be called tdfx.
900 732
901 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATIO !! 733 config DRM_R128
902 def_bool CRASH_RESERVE !! 734 tristate "ATI Rage 128"
>> 735 depends on DRM
>> 736 help
>> 737 Choose this option if you have an ATI Rage 128 graphics card. If M
>> 738 is selected, the module will be called r128. AGP support for
>> 739 this card is strongly suggested (unless you have a PCI version).
903 740
904 config COMPAT !! 741 endmenu
905 bool "Kernel support for 32-bit U-mode <<
906 default 64BIT <<
907 depends on 64BIT && MMU <<
908 help <<
909 This option enables support for a 32 <<
910 kernel at S-mode. riscv32-specific c <<
911 the user helper functions (vdso), si <<
912 ptrace interface are handled appropr <<
913 <<
914 If you want to execute 32-bit usersp <<
915 <<
916 config PARAVIRT <<
917 bool "Enable paravirtualization code" <<
918 depends on RISCV_SBI <<
919 help <<
920 This changes the kernel so it can mo <<
921 under a hypervisor, potentially impr <<
922 over full virtualization. <<
923 <<
924 config PARAVIRT_TIME_ACCOUNTING <<
925 bool "Paravirtual steal time accountin <<
926 depends on PARAVIRT <<
927 help <<
928 Select this option to enable fine gr <<
929 accounting. Time spent executing oth <<
930 the current vCPU is discounted from <<
931 that, there can be a small performan <<
932 <<
933 If in doubt, say N here. <<
934 <<
935 config RELOCATABLE <<
936 bool "Build a relocatable kernel" <<
937 depends on MMU && 64BIT && !XIP_KERNEL <<
938 select MODULE_SECTIONS if MODULES <<
939 help <<
940 This builds a kernel as a Position I <<
941 which retains all relocation metadat <<
942 kernel binary at runtime to a differ <<
943 address it was linked at. <<
944 Since RISCV uses the RELA relocation <<
945 relocation pass at runtime even if t <<
946 same address it was linked at. <<
947 <<
948 If unsure, say N. <<
949 <<
950 config RANDOMIZE_BASE <<
951 bool "Randomize the address of the ker <<
952 select RELOCATABLE <<
953 depends on MMU && 64BIT && !XIP_KERNEL <<
954 help <<
955 Randomizes the virtual address at wh <<
956 loaded, as a security feature that d <<
957 relying on knowledge of the location <<
958 <<
959 It is the bootloader's job to provid <<
960 random u64 value in /chosen/kaslr-se <<
961 <<
962 When booting via the UEFI stub, it w <<
963 EFI_RNG_PROTOCOL implementation (if <<
964 to the kernel proper. In addition, i <<
965 location of the kernel Image as well <<
966 <<
967 If unsure, say N. <<
968 <<
969 endmenu # "Kernel features" <<
970 <<
971 menu "Boot options" <<
972 <<
973 config CMDLINE <<
974 string "Built-in kernel command line" <<
975 help <<
976 For most platforms, the arguments fo <<
977 are provided at run-time, during boo <<
978 where either no arguments are being <<
979 arguments are insufficient or even i <<
980 742
981 When that occurs, it is possible to !! 743 source "drivers/input/Kconfig"
982 line here and choose how the kernel <<
983 744
984 choice !! 745 source "drivers/i2c/Kconfig"
985 prompt "Built-in command line usage" <<
986 depends on CMDLINE != "" <<
987 default CMDLINE_FALLBACK <<
988 help <<
989 Choose how the kernel will handle th <<
990 line. <<
991 <<
992 config CMDLINE_FALLBACK <<
993 bool "Use bootloader kernel arguments <<
994 help <<
995 Use the built-in command line as fal <<
996 during boot. This is the default beh <<
997 <<
998 config CMDLINE_EXTEND <<
999 bool "Extend bootloader kernel argumen <<
1000 help <<
1001 The command-line arguments provided <<
1002 appended to the built-in command li <<
1003 cases where the provided arguments <<
1004 you don't want to or cannot modify <<
1005 <<
1006 config CMDLINE_FORCE <<
1007 bool "Always use the default kernel c <<
1008 help <<
1009 Always use the built-in command lin <<
1010 boot. This is useful in case you ne <<
1011 command line on systems where you d <<
1012 over it. <<
1013 746
1014 endchoice !! 747 source "fs/Kconfig"
1015 748
1016 config EFI_STUB !! 749 source "drivers/media/Kconfig"
1017 bool <<
1018 750
1019 config EFI !! 751 source "sound/Kconfig"
1020 bool "UEFI runtime support" <<
1021 depends on OF && !XIP_KERNEL <<
1022 depends on MMU <<
1023 default y <<
1024 select ARCH_SUPPORTS_ACPI if 64BIT <<
1025 select EFI_GENERIC_STUB <<
1026 select EFI_PARAMS_FROM_FDT <<
1027 select EFI_RUNTIME_WRAPPERS <<
1028 select EFI_STUB <<
1029 select LIBFDT <<
1030 select RISCV_ISA_C <<
1031 select UCS2_STRING <<
1032 help <<
1033 This option provides support for ru <<
1034 by UEFI firmware (such as non-volat <<
1035 clock, and platform reset). A UEFI <<
1036 allow the kernel to be booted as an <<
1037 is only useful on systems that have <<
1038 <<
1039 config DMI <<
1040 bool "Enable support for SMBIOS (DMI) <<
1041 depends on EFI <<
1042 default y <<
1043 help <<
1044 This enables SMBIOS/DMI feature for <<
1045 752
1046 This option is only useful on syste !! 753 source "drivers/usb/Kconfig"
1047 However, even with this option, the <<
1048 continue to boot on existing non-UE <<
1049 754
1050 config CC_HAVE_STACKPROTECTOR_TLS <<
1051 def_bool $(cc-option,-mstack-protecto <<
1052 755
1053 config STACKPROTECTOR_PER_TASK !! 756 menu "Watchdog"
1054 def_bool y <<
1055 depends on !RANDSTRUCT <<
1056 depends on STACKPROTECTOR && CC_HAVE_ <<
1057 757
1058 config PHYS_RAM_BASE_FIXED !! 758 config SOFT_WATCHDOG
1059 bool "Explicitly specified physical R !! 759 tristate "Software watchdog"
1060 depends on NONPORTABLE !! 760 help
1061 default n !! 761 A software monitoring watchdog. This will fail to reboot your system
1062 !! 762 from some situations that the hardware watchdog will recover
1063 config PHYS_RAM_BASE !! 763 from. Equally it's a lot cheaper to install.
1064 hex "Platform Physical RAM address" <<
1065 depends on PHYS_RAM_BASE_FIXED <<
1066 default "0x80000000" <<
1067 help <<
1068 This is the physical address of RAM <<
1069 explicitly specified to run early r <<
1070 from flash to RAM. <<
1071 <<
1072 config XIP_KERNEL <<
1073 bool "Kernel Execute-In-Place from RO <<
1074 depends on MMU && SPARSEMEM && NONPOR <<
1075 # This prevents XIP from being enable <<
1076 # fail to build since XIP doesn't sup <<
1077 depends on !COMPILE_TEST <<
1078 select PHYS_RAM_BASE_FIXED <<
1079 help <<
1080 Execute-In-Place allows the kernel <<
1081 directly addressable by the CPU, su <<
1082 space since the text section of the <<
1083 to RAM. Read-write sections, such <<
1084 are still copied to RAM. The XIP k <<
1085 it has to run directly from flash, <<
1086 store it. The flash address used t <<
1087 and for storing it, is configuratio <<
1088 say Y here, you must know the prope <<
1089 store the kernel image depending on <<
1090 <<
1091 Also note that the make target beco <<
1092 "make zImage" or "make Image". The <<
1093 ROM memory will be arch/riscv/boot/ <<
1094 <<
1095 SPARSEMEM is required because the k <<
1096 flash resident are not backed by me <<
1097 a struct page on those regions will <<
1098 764
1099 If unsure, say N. !! 765 To compile this driver as a module, choose M here: the
>> 766 module will be called softdog.
1100 767
1101 config XIP_PHYS_ADDR !! 768 endmenu
1102 hex "XIP Kernel Physical Location" <<
1103 depends on XIP_KERNEL <<
1104 default "0x21000000" <<
1105 help <<
1106 This is the physical address in you <<
1107 be linked for and stored to. This <<
1108 own flash usage. <<
1109 769
1110 config RISCV_ISA_FALLBACK !! 770 source "arch/sparc64/oprofile/Kconfig"
1111 bool "Permit falling back to parsing <<
1112 default y <<
1113 help <<
1114 Parsing the "riscv,isa" devicetree <<
1115 replaced by a list of explicitly de <<
1116 with existing platforms, the kernel <<
1117 "riscv,isa" property if the replace <<
1118 <<
1119 Selecting N here will result in a k <<
1120 fallback, unless the commandline "r <<
1121 present. <<
1122 <<
1123 Please see the dt-binding, located <<
1124 Documentation/devicetree/bindings/r <<
1125 on the replacement properties, "ris <<
1126 "riscv,isa-extensions". <<
1127 <<
1128 config BUILTIN_DTB <<
1129 bool "Built-in device tree" <<
1130 depends on OF && NONPORTABLE <<
1131 help <<
1132 Build a device tree into the Linux <<
1133 This option should be selected if n <<
1134 If unsure, say N. <<
1135 771
>> 772 menu "Kernel hacking"
1136 773
1137 config BUILTIN_DTB_SOURCE !! 774 config DEBUG_KERNEL
1138 string "Built-in device tree source" !! 775 bool "Kernel debugging"
1139 depends on BUILTIN_DTB <<
1140 help 776 help
1141 DTS file path (without suffix, rela !! 777 Say Y here if you are developing drivers or trying to debug and
1142 for the DTS file that will be used !! 778 identify kernel problems.
1143 kernel. <<
1144 779
1145 endmenu # "Boot options" !! 780 config DEBUG_SLAB
1146 !! 781 bool "Debug memory allocations"
1147 config PORTABLE !! 782 depends on DEBUG_KERNEL
1148 bool !! 783 help
1149 default !NONPORTABLE !! 784 Say Y here to have the kernel do limited verification on memory
1150 select EFI !! 785 allocation as well as poisoning memory on free to catch use of freed
1151 select MMU !! 786 memory.
1152 select OF <<
1153 787
1154 config ARCH_PROC_KCORE_TEXT !! 788 config MAGIC_SYSRQ
1155 def_bool y !! 789 bool "Magic SysRq key"
>> 790 depends on DEBUG_KERNEL
>> 791 help
>> 792 If you say Y here, you will have some control over the system even
>> 793 if the system crashes for example during kernel debugging (e.g., you
>> 794 will be able to flush the buffer cache to disk, reboot the system
>> 795 immediately or dump some status information). This is accomplished
>> 796 by pressing various keys while holding SysRq (Alt+PrintScreen). It
>> 797 also works on a serial console (on PC hardware at least), if you
>> 798 send a BREAK and then within 5 seconds a command keypress. The
>> 799 keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
>> 800 unless you really know what this hack does.
1156 801
1157 menu "Power management options" !! 802 config DEBUG_SPINLOCK
>> 803 bool "Spinlock debugging"
>> 804 depends on DEBUG_KERNEL
>> 805 help
>> 806 Say Y here and build SMP to catch missing spinlock initialization
>> 807 and certain other kinds of spinlock errors commonly made. This is
>> 808 best used in conjunction with the NMI watchdog so that spinlock
>> 809 deadlocks are also debuggable.
1158 810
1159 source "kernel/power/Kconfig" !! 811 # We have a custom atomic_dec_and_lock() implementation but it's not
>> 812 # compatible with spinlock debugging so we need to fall back on
>> 813 # the generic version in that case.
>> 814 config HAVE_DEC_LOCK
>> 815 bool
>> 816 depends on SMP && !DEBUG_SPINLOCK
>> 817 default y
1160 818
1161 config ARCH_HIBERNATION_POSSIBLE !! 819 config DEBUG_SPINLOCK_SLEEP
1162 def_bool y !! 820 bool "Sleep-inside-spinlock checking"
>> 821 help
>> 822 If you say Y here, various routines which may sleep will become very
>> 823 noisy if they are called with a spinlock held.
1163 824
1164 config ARCH_HIBERNATION_HEADER !! 825 config DEBUG_BUGVERBOSE
1165 def_bool HIBERNATION !! 826 bool "Verbose BUG() reporting (adds 70K)"
>> 827 depends on DEBUG_KERNEL
>> 828 help
>> 829 Say Y here to make BUG() panics output the file name and line number
>> 830 of the BUG call as well as the EIP and oops trace. This aids
>> 831 debugging but costs about 70-100K of memory.
1166 832
1167 config ARCH_SUSPEND_POSSIBLE !! 833 config DEBUG_DCFLUSH
1168 def_bool y !! 834 bool "D-cache flush debugging"
>> 835 depends on DEBUG_KERNEL
1169 836
1170 endmenu # "Power management options" !! 837 config DEBUG_INFO
>> 838 bool "Compile the kernel with debug info"
>> 839 depends on DEBUG_KERNEL
>> 840 help
>> 841 If you say Y here the resulting kernel image will include
>> 842 debugging info resulting in a larger kernel image.
>> 843 Say Y here only if you plan to use gdb to debug the kernel.
>> 844 If you don't debug the kernel, you can say N.
>> 845
>> 846 config STACK_DEBUG
>> 847 bool "Stack Overflow Detection Support"
1171 848
1172 menu "CPU Power Management" !! 849 config MCOUNT
>> 850 bool
>> 851 depends on STACK_DEBUG
>> 852 default y
1173 853
1174 source "drivers/cpuidle/Kconfig" !! 854 endmenu
1175 855
1176 source "drivers/cpufreq/Kconfig" !! 856 source "security/Kconfig"
1177 857
1178 endmenu # "CPU Power Management" !! 858 source "crypto/Kconfig"
1179 859
1180 source "arch/riscv/kvm/Kconfig" !! 860 source "lib/Kconfig"
1181 861
1182 source "drivers/acpi/Kconfig" <<
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