1 # SPDX-License-Identifier: GPL-2.0-only !! 1 # SPDX-License-Identifier: GPL-2.0
2 # !! 2 config ALPHA
3 # Copyright (C) 2004, 2007-2010, 2011-2012 Syn !! 3 bool
4 # !! 4 default y
5 !! 5 select ARCH_MIGHT_HAVE_PC_PARPORT
6 config ARC !! 6 select ARCH_MIGHT_HAVE_PC_SERIO
7 def_bool y !! 7 select ARCH_NO_PREEMPT
8 select ARC_TIMERS !! 8 select ARCH_NO_SG_CHAIN
9 select ARCH_HAS_CACHE_LINE_SIZE !! 9 select ARCH_USE_CMPXCHG_LOCKREF
10 select ARCH_HAS_DEBUG_VM_PGTABLE !! 10 select FORCE_PCI if !ALPHA_JENSEN
11 select ARCH_HAS_DMA_PREP_COHERENT !! 11 select PCI_DOMAINS if PCI
12 select ARCH_HAS_PTE_SPECIAL !! 12 select PCI_SYSCALL if PCI
13 select ARCH_HAS_SETUP_DMA_OPS !! 13 select HAVE_AOUT
14 select ARCH_HAS_SYNC_DMA_FOR_CPU !! 14 select HAVE_IDE
15 select ARCH_HAS_SYNC_DMA_FOR_DEVICE !! 15 select HAVE_OPROFILE
16 select ARCH_NEED_CMPXCHG_1_EMU !! 16 select HAVE_PCSPKR_PLATFORM
17 select ARCH_SUPPORTS_ATOMIC_RMW if ARC !! 17 select HAVE_PERF_EVENTS
18 select ARCH_32BIT_OFF_T !! 18 select NEED_DMA_MAP_STATE
19 select BUILDTIME_TABLE_SORT !! 19 select NEED_SG_DMA_LENGTH
20 select CLONE_BACKWARDS !! 20 select VIRT_TO_BUS
21 select COMMON_CLK !! 21 select GENERIC_IRQ_PROBE
22 select DMA_DIRECT_REMAP !! 22 select GENERIC_PCI_IOMAP if PCI
23 select GENERIC_ATOMIC64 if !ISA_ARCV2 !! 23 select AUTO_IRQ_AFFINITY if SMP
24 # for now, we don't need GENERIC_IRQ_P <<
25 select GENERIC_IRQ_SHOW 24 select GENERIC_IRQ_SHOW
26 select GENERIC_PCI_IOMAP !! 25 select ARCH_WANT_IPC_PARSE_VERSION
27 select GENERIC_PENDING_IRQ if SMP !! 26 select ARCH_HAVE_NMI_SAFE_CMPXCHG
28 select GENERIC_SCHED_CLOCK !! 27 select AUDIT_ARCH
>> 28 select GENERIC_CLOCKEVENTS
>> 29 select GENERIC_CPU_VULNERABILITIES
29 select GENERIC_SMP_IDLE_THREAD 30 select GENERIC_SMP_IDLE_THREAD
30 select GENERIC_IOREMAP !! 31 select GENERIC_STRNCPY_FROM_USER
31 select GENERIC_STRNCPY_FROM_USER if MM !! 32 select GENERIC_STRNLEN_USER
32 select GENERIC_STRNLEN_USER if MMU !! 33 select HAVE_ARCH_AUDITSYSCALL
33 select HAVE_ARCH_KGDB <<
34 select HAVE_ARCH_TRACEHOOK <<
35 select HAVE_ARCH_TRANSPARENT_HUGEPAGE <<
36 select HAVE_DEBUG_STACKOVERFLOW <<
37 select HAVE_DEBUG_KMEMLEAK <<
38 select HAVE_IOREMAP_PROT <<
39 select HAVE_KERNEL_GZIP <<
40 select HAVE_KERNEL_LZMA <<
41 select HAVE_KPROBES <<
42 select HAVE_KRETPROBES <<
43 select HAVE_REGS_AND_STACK_ACCESS_API <<
44 select HAVE_MOD_ARCH_SPECIFIC 34 select HAVE_MOD_ARCH_SPECIFIC
45 select HAVE_PERF_EVENTS <<
46 select HAVE_SYSCALL_TRACEPOINTS <<
47 select IRQ_DOMAIN <<
48 select LOCK_MM_AND_FIND_VMA <<
49 select MODULES_USE_ELF_RELA 35 select MODULES_USE_ELF_RELA
50 select OF !! 36 select ODD_RT_SIGACTION
51 select OF_EARLY_FLATTREE !! 37 select OLD_SIGSUSPEND
52 select PCI_SYSCALL if PCI !! 38 select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
53 select HAVE_ARCH_JUMP_LABEL if ISA_ARC !! 39 help
54 select TRACE_IRQFLAGS_SUPPORT !! 40 The Alpha is a 64-bit general-purpose processor designed and
55 select HAVE_EBPF_JIT if ISA_ARCV2 !! 41 marketed by the Digital Equipment Corporation of blessed memory,
>> 42 now Hewlett-Packard. The Alpha Linux project has a home page at
>> 43 <http://www.alphalinux.org/>.
56 44
57 config LOCKDEP_SUPPORT !! 45 config 64BIT
58 def_bool y 46 def_bool y
59 47
60 config SCHED_OMIT_FRAME_POINTER !! 48 config MMU
61 def_bool y !! 49 bool
>> 50 default y
62 51
63 config GENERIC_CSUM !! 52 config RWSEM_GENERIC_SPINLOCK
64 def_bool y !! 53 bool
65 54
66 config ARCH_FLATMEM_ENABLE !! 55 config RWSEM_XCHGADD_ALGORITHM
67 def_bool y !! 56 bool
>> 57 default y
68 58
69 config MMU !! 59 config ARCH_HAS_ILOG2_U32
70 def_bool y !! 60 bool
>> 61 default n
71 62
72 config NO_IOPORT_MAP !! 63 config ARCH_HAS_ILOG2_U64
73 def_bool y !! 64 bool
>> 65 default n
74 66
75 config GENERIC_CALIBRATE_DELAY 67 config GENERIC_CALIBRATE_DELAY
76 def_bool y !! 68 bool
77 !! 69 default y
78 config GENERIC_HWEIGHT <<
79 def_bool y <<
80 70
81 config STACKTRACE_SUPPORT !! 71 config ZONE_DMA
82 def_bool y !! 72 bool
83 select STACKTRACE !! 73 default y
84 74
85 menu "ARC Architecture Configuration" !! 75 config GENERIC_ISA_DMA
>> 76 bool
>> 77 default y
86 78
87 menu "ARC Platform/SoC/Board" !! 79 config PGTABLE_LEVELS
>> 80 int
>> 81 default 3
88 82
89 source "arch/arc/plat-tb10x/Kconfig" !! 83 config AUDIT_ARCH
90 source "arch/arc/plat-axs10x/Kconfig" !! 84 bool
91 source "arch/arc/plat-hsdk/Kconfig" <<
92 85
93 endmenu !! 86 menu "System setup"
94 87
95 choice 88 choice
96 prompt "ARC Instruction Set" !! 89 prompt "Alpha system type"
97 default ISA_ARCV2 !! 90 default ALPHA_GENERIC
>> 91 ---help---
>> 92 This is the system type of your hardware. A "generic" kernel will
>> 93 run on any supported Alpha system. However, if you configure a
>> 94 kernel for your specific system, it will be faster and smaller.
98 95
99 config ISA_ARCOMPACT !! 96 To find out what type of Alpha system you have, you may want to
100 bool "ARCompact ISA" !! 97 check out the Linux/Alpha FAQ, accessible on the WWW from
101 select CPU_NO_EFFICIENT_FFS !! 98 <http://www.alphalinux.org/>. In summary:
102 help !! 99
103 The original ARC ISA of ARC600/700 c !! 100 Alcor/Alpha-XLT AS 600, AS 500, XL-300, XL-366
>> 101 Alpha-XL XL-233, XL-266
>> 102 AlphaBook1 Alpha laptop
>> 103 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, AS 400
>> 104 Cabriolet AlphaPC64, AlphaPCI64
>> 105 DP264 DP264 / DS20 / ES40 / DS10 / DS10L
>> 106 EB164 EB164 21164 evaluation board
>> 107 EB64+ EB64+ 21064 evaluation board
>> 108 EB66 EB66 21066 evaluation board
>> 109 EB66+ EB66+ 21066 evaluation board
>> 110 Jensen DECpc 150, DEC 2000 models 300, 500
>> 111 LX164 AlphaPC164-LX
>> 112 Lynx AS 2100A
>> 113 Miata Personal Workstation 433/500/600 a/au
>> 114 Marvel AlphaServer ES47 / ES80 / GS1280
>> 115 Mikasa AS 1000
>> 116 Noname AXPpci33, UDB (Multia)
>> 117 Noritake AS 1000A, AS 600A, AS 800
>> 118 PC164 AlphaPC164
>> 119 Rawhide AS 1200, AS 4000, AS 4100
>> 120 Ruffian RPX164-2, AlphaPC164-UX, AlphaPC164-BX
>> 121 SX164 AlphaPC164-SX
>> 122 Sable AS 2000, AS 2100
>> 123 Shark DS 20L
>> 124 Takara Takara (OEM)
>> 125 Titan AlphaServer ES45 / DS25 / DS15
>> 126 Wildfire AlphaServer GS 40/80/160/320
>> 127
>> 128 If you don't know what to do, choose "generic".
104 129
105 config ISA_ARCV2 !! 130 config ALPHA_GENERIC
106 bool "ARC ISA v2" !! 131 bool "Generic"
107 select ARC_TIMERS_64BIT !! 132 depends on TTY
>> 133 select HAVE_EISA
108 help 134 help
109 ISA for the Next Generation ARC-HS c !! 135 A generic kernel will run on all supported Alpha hardware.
110 136
111 endchoice !! 137 config ALPHA_ALCOR
>> 138 bool "Alcor/Alpha-XLT"
>> 139 select HAVE_EISA
>> 140 help
>> 141 For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
>> 142 slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
>> 143 Address, CIA) - a 383 pin plastic PGA). It provides a DRAM
>> 144 controller (256-bit memory bus) and a PCI interface. It also does
>> 145 all the work required to support an external Bcache and to maintain
>> 146 memory coherence when a PCI device DMAs into (or out of) memory.
112 147
113 menu "ARC CPU Configuration" !! 148 config ALPHA_XL
>> 149 bool "Alpha-XL"
>> 150 help
>> 151 XL-233 and XL-266-based Alpha systems.
114 152
115 choice !! 153 config ALPHA_BOOK1
116 prompt "ARC Core" !! 154 bool "AlphaBook1"
117 default ARC_CPU_770 if ISA_ARCOMPACT !! 155 help
118 default ARC_CPU_HS if ISA_ARCV2 !! 156 Dec AlphaBook1/Burns Alpha-based laptops.
119 <<
120 config ARC_CPU_770 <<
121 bool "ARC770" <<
122 depends on ISA_ARCOMPACT <<
123 select ARC_HAS_SWAPE <<
124 help <<
125 Support for ARC770 core introduced w <<
126 This core has a bunch of cool new fe <<
127 -MMU-v3: Variable Page Sz (4k, 8k, 1 <<
128 Shared Address Spaces (for <<
129 -Caches: New Prog Model, Region Flus <<
130 -Insns: endian swap, load-locked/sto <<
131 <<
132 config ARC_CPU_HS <<
133 bool "ARC-HS" <<
134 depends on ISA_ARCV2 <<
135 help <<
136 Support for ARC HS38x Cores based on <<
137 The notable features are: <<
138 - SMP configurations of up to 4 co <<
139 - Optional L2 Cache and IO-Coheren <<
140 - Revised Interrupt Architecture ( <<
141 auto stack switch, auto regfil <<
142 - MMUv4 (PIPT dcache, Huge Pages) <<
143 - Instructions for <<
144 * 64bit load/store: LDD, STD <<
145 * Hardware assisted divide/rem <<
146 * Function prologue/epilogue: <<
147 * IRQ enable/disable: CLRI, SE <<
148 * pop count: FFS, FLS <<
149 * SETcc, BMSKN, XBFU... <<
150 157
151 endchoice !! 158 config ALPHA_AVANTI_CH
>> 159 bool "Avanti"
152 160
153 config ARC_TUNE_MCPU !! 161 config ALPHA_CABRIOLET
154 string "Override default -mcpu compile !! 162 bool "Cabriolet"
155 default "" !! 163 help
156 help !! 164 Cabriolet AlphaPC64, AlphaPCI64 systems. Derived from EB64+ but now
157 Override default -mcpu=xxx compiler !! 165 baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA
158 the ISA version) with the specified !! 166 slots, 4 PCI slots (one pair are on a shared slot), uses plug-in
159 NOTE: If specified flag isn't suppor !! 167 Bcache SIMMs. Requires power supply with 3.3V output.
160 ISA default value will be used as a <<
161 168
162 config CPU_BIG_ENDIAN !! 169 config ALPHA_DP264
163 bool "Enable Big Endian Mode" !! 170 bool "DP264"
164 help 171 help
165 Build kernel for Big Endian Mode of !! 172 Various 21264 systems with the tsunami core logic chipset.
>> 173 API Networks: 264DP, UP2000(+), CS20;
>> 174 Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40.
166 175
167 config SMP !! 176 config ALPHA_EB164
168 bool "Symmetric Multi-Processing" !! 177 bool "EB164"
169 select ARC_MCIP if ISA_ARCV2 <<
170 help 178 help
171 This enables support for systems wit !! 179 EB164 21164 evaluation board from DEC. Uses 21164 and ALCOR. Has
>> 180 ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is
>> 181 shared with an ISA slot) and 2 32-bit PCI slots. Uses plus-in
>> 182 Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD,
>> 183 MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized
>> 184 motherboard. Requires power supply with 3.3V output.
172 185
173 if SMP !! 186 config ALPHA_EB64P_CH
>> 187 bool "EB64+"
174 188
175 config NR_CPUS !! 189 config ALPHA_EB66
176 int "Maximum number of CPUs (2-4096)" !! 190 bool "EB66"
177 range 2 4096 <<
178 default "4" <<
179 <<
180 config ARC_SMP_HALT_ON_RESET <<
181 bool "Enable Halt-on-reset boot mode" <<
182 help <<
183 In SMP configuration cores can be co <<
184 or they could all start at same time <<
185 masters are parked until Master kick <<
186 at designated entry point. For other <<
187 entry point and spin wait for Master <<
188 <<
189 endif #SMP <<
190 <<
191 config ARC_MCIP <<
192 bool "ARConnect Multicore IP (MCIP) Su <<
193 depends on ISA_ARCV2 <<
194 default y if SMP <<
195 help 191 help
196 This IP block enables SMP in ARC-HS3 !! 192 A Digital DS group board. Uses 21066 or 21066A. I/O sub-system is
197 It provides for cross-core interrupt !! 193 identical to EB64+. Baby PC-AT size. Runs from standard PC power
198 hardware semaphores, shared memory,. !! 194 supply. The EB66 schematic was published as a marketing poster
>> 195 advertising the 21066 as "the first microprocessor in the world with
>> 196 embedded PCI".
199 197
200 menuconfig ARC_CACHE !! 198 config ALPHA_EB66P
201 bool "Enable Cache Support" !! 199 bool "EB66+"
202 default y !! 200 help
>> 201 Later variant of the EB66 board.
203 202
204 if ARC_CACHE !! 203 config ALPHA_EIGER
>> 204 bool "Eiger"
>> 205 help
>> 206 Apparently an obscure OEM single-board computer based on the
>> 207 Typhoon/Tsunami chipset family. Information on it is scanty.
205 208
206 config ARC_CACHE_LINE_SHIFT !! 209 config ALPHA_JENSEN
207 int "Cache Line Length (as power of 2) !! 210 bool "Jensen"
208 range 5 7 !! 211 depends on BROKEN
209 default "6" !! 212 select HAVE_EISA
210 help 213 help
211 Starting with ARC700 4.9, Cache line !! 214 DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
212 This option specifies "N", with Line !! 215 of the first-generation Alpha systems. A number of these systems
213 So line lengths of 32, 64, 128 are s !! 216 seem to be available on the second- hand market. The Jensen is a
214 Linux only supports same line length !! 217 floor-standing tower system which originally used a 150MHz 21064 It
>> 218 used programmable logic to interface a 486 EISA I/O bridge to the
>> 219 CPU.
215 220
216 config ARC_HAS_ICACHE !! 221 config ALPHA_LX164
217 bool "Use Instruction Cache" !! 222 bool "LX164"
218 default y !! 223 help
>> 224 A technical overview of this board is available at
>> 225 <http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>.
219 226
220 config ARC_HAS_DCACHE !! 227 config ALPHA_LYNX
221 bool "Use Data Cache" !! 228 bool "Lynx"
222 default y !! 229 select HAVE_EISA
>> 230 help
>> 231 AlphaServer 2100A-based systems.
223 232
224 config ARC_CACHE_PAGES !! 233 config ALPHA_MARVEL
225 bool "Per Page Cache Control" !! 234 bool "Marvel"
226 default y <<
227 depends on ARC_HAS_ICACHE || ARC_HAS_D <<
228 help 235 help
229 This can be used to over-ride the gl !! 236 AlphaServer ES47 / ES80 / GS1280 based on EV7.
230 per-page basis (but only for pages a <<
231 Kernel Virtual address or User Virtu <<
232 TLB entries have a per-page Cache En <<
233 Note that Global I/D ENABLE + Per Pa <<
234 Global DISABLE + Per Page ENABLE won <<
235 237
236 endif #ARC_CACHE !! 238 config ALPHA_MIATA
>> 239 bool "Miata"
>> 240 select HAVE_EISA
>> 241 help
>> 242 The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a,
>> 243 or 600au).
237 244
238 config ARC_HAS_ICCM !! 245 config ALPHA_MIKASA
239 bool "Use ICCM" !! 246 bool "Mikasa"
240 help 247 help
241 Single Cycle RAMS to store Fast Path !! 248 AlphaServer 1000-based Alpha systems.
242 249
243 config ARC_ICCM_SZ !! 250 config ALPHA_NAUTILUS
244 int "ICCM Size in KB" !! 251 bool "Nautilus"
245 default "64" !! 252 help
246 depends on ARC_HAS_ICCM !! 253 Alpha systems based on the AMD 751 & ALI 1543C chipsets.
>> 254
>> 255 config ALPHA_NONAME_CH
>> 256 bool "Noname"
247 257
248 config ARC_HAS_DCCM !! 258 config ALPHA_NORITAKE
249 bool "Use DCCM" !! 259 bool "Noritake"
>> 260 select HAVE_EISA
250 help 261 help
251 Single Cycle RAMS to store Fast Path !! 262 AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based
>> 263 systems.
252 264
253 config ARC_DCCM_SZ !! 265 config ALPHA_PC164
254 int "DCCM Size in KB" !! 266 bool "PC164"
255 default "64" <<
256 depends on ARC_HAS_DCCM <<
257 267
258 config ARC_DCCM_BASE !! 268 config ALPHA_P2K
259 hex "DCCM map address" !! 269 bool "Platform2000"
260 default "0xA0000000" <<
261 depends on ARC_HAS_DCCM <<
262 270
263 choice !! 271 config ALPHA_RAWHIDE
264 prompt "MMU Version" !! 272 bool "Rawhide"
265 default ARC_MMU_V3 if ISA_ARCOMPACT !! 273 select HAVE_EISA
266 default ARC_MMU_V4 if ISA_ARCV2 !! 274 help
267 !! 275 AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines.
268 config ARC_MMU_V3 !! 276 See HOWTO at
269 bool "MMU v3" !! 277 <http://www.alphalinux.org/docs/rawhide/4100_install.shtml>.
270 depends on ISA_ARCOMPACT <<
271 help <<
272 Introduced with ARC700 4.10: New Fea <<
273 Variable Page size (1k-16k), var JTL <<
274 Shared Address Spaces (SASID) <<
275 <<
276 config ARC_MMU_V4 <<
277 bool "MMU v4" <<
278 depends on ISA_ARCV2 <<
279 278
280 endchoice !! 279 config ALPHA_RUFFIAN
>> 280 bool "Ruffian"
>> 281 help
>> 282 Samsung APC164UX. There is a page on known problems and workarounds
>> 283 at <http://www.alphalinux.org/faq/FAQ-11.html>.
281 284
>> 285 config ALPHA_RX164
>> 286 bool "RX164"
282 287
283 choice !! 288 config ALPHA_SX164
284 prompt "MMU Page Size" !! 289 bool "SX164"
285 default ARC_PAGE_SIZE_8K <<
286 290
287 config ARC_PAGE_SIZE_8K !! 291 config ALPHA_SABLE
288 bool "8KB" !! 292 bool "Sable"
289 select HAVE_PAGE_SIZE_8KB !! 293 select HAVE_EISA
290 help !! 294 help
291 Choose between 8k vs 16k !! 295 Digital AlphaServer 2000 and 2100-based systems.
292 <<
293 config ARC_PAGE_SIZE_16K <<
294 select HAVE_PAGE_SIZE_16KB <<
295 bool "16KB" <<
296 <<
297 config ARC_PAGE_SIZE_4K <<
298 bool "4KB" <<
299 select HAVE_PAGE_SIZE_4KB <<
300 depends on ARC_MMU_V3 || ARC_MMU_V4 <<
301 296
302 endchoice !! 297 config ALPHA_SHARK
>> 298 bool "Shark"
303 299
304 choice !! 300 config ALPHA_TAKARA
305 prompt "MMU Super Page Size" !! 301 bool "Takara"
306 depends on ISA_ARCV2 && TRANSPARENT_HU !! 302 help
307 default ARC_HUGEPAGE_2M !! 303 Alpha 11164-based OEM single-board computer.
308 304
309 config ARC_HUGEPAGE_2M !! 305 config ALPHA_TITAN
310 bool "2MB" !! 306 bool "Titan"
>> 307 help
>> 308 AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset.
311 309
312 config ARC_HUGEPAGE_16M !! 310 config ALPHA_WILDFIRE
313 bool "16MB" !! 311 bool "Wildfire"
>> 312 help
>> 313 AlphaServer GS 40/80/160/320 SMP based on the EV67 core.
314 314
315 endchoice 315 endchoice
316 316
317 config PGTABLE_LEVELS !! 317 # clear all implied options (don't want default values for those):
318 int "Number of Page table levels" !! 318 # Most of these machines have ISA slots; not exactly sure which don't,
319 default 2 !! 319 # and this doesn't activate hordes of code, so do it always.
>> 320 config ISA
>> 321 bool
>> 322 default y
>> 323 help
>> 324 Find out whether you have ISA slots on your motherboard. ISA is the
>> 325 name of a bus system, i.e. the way the CPU talks to the other stuff
>> 326 inside your box. Other bus systems are PCI, EISA, MicroChannel
>> 327 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
>> 328 newer boards don't support it. If you have ISA, say Y, otherwise N.
320 329
321 config ARC_COMPACT_IRQ_LEVELS !! 330 config ISA_DMA_API
322 depends on ISA_ARCOMPACT !! 331 bool
323 bool "Setup Timer IRQ as high Priority !! 332 default y
324 # if SMP, LV2 enabled ONLY if ARC impl <<
325 depends on !SMP <<
326 333
327 config ARC_FPU_SAVE_RESTORE !! 334 config ALPHA_NONAME
328 bool "Enable FPU state persistence acr !! 335 bool
>> 336 depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
>> 337 default y
329 help 338 help
330 ARCompact FPU has internal registers !! 339 The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia
331 Floating Point operations. There are !! 340 UDB). This design was produced by Digital's Technical OEM (TOEM)
332 for floating point exceptions and ro !! 341 group. It uses the 21066 processor running at 166MHz or 233MHz. It
333 preserved across task context switch !! 342 is a baby-AT size, and runs from a standard PC power supply. It has
>> 343 5 ISA slots and 3 PCI slots (one pair are a shared slot). There are
>> 344 2 versions, with either PS/2 or large DIN connectors for the
>> 345 keyboard.
334 346
335 config ARC_CANT_LLSC !! 347 config ALPHA_EV4
336 def_bool n !! 348 bool
>> 349 depends on ALPHA_JENSEN || (ALPHA_SABLE && !ALPHA_GAMMA) || ALPHA_LYNX || ALPHA_NORITAKE && !ALPHA_PRIMO || ALPHA_MIKASA && !ALPHA_PRIMO || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL || ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
>> 350 default y if !ALPHA_LYNX
337 351
338 config ARC_HAS_LLSC !! 352 config ALPHA_LCA
339 bool "Insn: LLOCK/SCOND (efficient ato !! 353 bool
>> 354 depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
340 default y 355 default y
341 depends on !ARC_CANT_LLSC <<
342 356
343 config ARC_HAS_SWAPE !! 357 config ALPHA_APECS
344 bool "Insn: SWAPE (endian-swap)" !! 358 bool
>> 359 depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL
345 default y 360 default y
346 361
347 if ISA_ARCV2 !! 362 config ALPHA_EB64P
>> 363 bool
>> 364 depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH
>> 365 default y
>> 366 help
>> 367 Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3 ISA,
>> 368 2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs.
>> 369 ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI
>> 370 (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style),
>> 371 SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM. PC-AT size.
>> 372 Runs from standard PC power supply.
>> 373
>> 374 config ALPHA_EV5
>> 375 bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX
>> 376 default y if ALPHA_RX164 || ALPHA_RAWHIDE || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_SABLE && ALPHA_GAMMA || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
>> 377
>> 378 config ALPHA_EV4
>> 379 bool
>> 380 default y if ALPHA_LYNX && !ALPHA_EV5
348 381
349 config ARC_USE_UNALIGNED_MEM_ACCESS !! 382 config ALPHA_CIA
350 bool "Enable unaligned access in HW" !! 383 bool
>> 384 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
351 default y 385 default y
352 select HAVE_EFFICIENT_UNALIGNED_ACCESS !! 386
>> 387 config ALPHA_EV56
>> 388 bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR
>> 389 default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA
>> 390
>> 391 config ALPHA_EV56
>> 392 prompt "EV56 CPU (speed >= 333MHz)?"
>> 393 depends on ALPHA_NORITAKE || ALPHA_PRIMO
>> 394
>> 395 config ALPHA_EV56
>> 396 prompt "EV56 CPU (speed >= 400MHz)?"
>> 397 depends on ALPHA_RAWHIDE
>> 398
>> 399 config ALPHA_PRIMO
>> 400 bool "EV5 CPU daughtercard (model 5/xxx)?"
>> 401 depends on ALPHA_NORITAKE || ALPHA_MIKASA
353 help 402 help
354 The ARC HS architecture supports una !! 403 Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx.
355 which is disabled by default. Enable <<
356 hardware and use software to use it <<
357 404
358 config ARC_HAS_LL64 !! 405 config ALPHA_GAMMA
359 bool "Insn: 64bit LDD/STD" !! 406 bool "EV5 CPU(s) (model 5/xxx)?"
>> 407 depends on ALPHA_SABLE
360 help 408 help
361 Enable gcc to generate 64-bit load/s !! 409 Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx.
362 ISA mandates even/odd registers to a <<
363 dest operands with 2 possible source <<
364 default y <<
365 410
366 config ARC_HAS_DIV_REM !! 411 config ALPHA_GAMMA
367 bool "Insn: div, divu, rem, remu" !! 412 bool
>> 413 depends on ALPHA_LYNX
368 default y 414 default y
369 415
370 config ARC_HAS_ACCL_REGS !! 416 config ALPHA_T2
371 bool "Reg Pair ACCL:ACCH (FPU and/or M !! 417 bool
>> 418 depends on ALPHA_SABLE || ALPHA_LYNX
372 default y 419 default y
373 help <<
374 Depending on the configuration, CPU <<
375 (also referred to as r58:r59). These <<
376 kernel needs to save/restore per pro <<
377 420
378 config ARC_DSP_HANDLED !! 421 config ALPHA_PYXIS
379 def_bool n !! 422 bool
>> 423 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
>> 424 default y
380 425
381 config ARC_DSP_SAVE_RESTORE_REGS !! 426 config ALPHA_EV6
382 def_bool n !! 427 bool
>> 428 depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
>> 429 default y
383 430
384 choice !! 431 config ALPHA_TSUNAMI
385 prompt "DSP support" !! 432 bool
386 default ARC_DSP_NONE !! 433 depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
387 help !! 434 default y
388 Depending on the configuration, CPU <<
389 (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_ <<
390 Below are options describing how to <<
391 interrupt entry / exit and in contex <<
392 <<
393 config ARC_DSP_NONE <<
394 bool "No DSP extension presence in HW" <<
395 help <<
396 No DSP extension presence in HW <<
397 <<
398 config ARC_DSP_KERNEL <<
399 bool "DSP extension in HW, no support <<
400 select ARC_HAS_ACCL_REGS <<
401 select ARC_DSP_HANDLED <<
402 help <<
403 DSP extension presence in HW, no sup <<
404 applications. We don't save / restor <<
405 some minimal preparations so userspa <<
406 <<
407 config ARC_DSP_USERSPACE <<
408 bool "Support DSP for userspace apps" <<
409 select ARC_HAS_ACCL_REGS <<
410 select ARC_DSP_HANDLED <<
411 select ARC_DSP_SAVE_RESTORE_REGS <<
412 help <<
413 DSP extension presence in HW, suppor <<
414 run DSP-enabled userspace applicatio <<
415 <<
416 config ARC_DSP_AGU_USERSPACE <<
417 bool "Support DSP with AGU for userspa <<
418 select ARC_HAS_ACCL_REGS <<
419 select ARC_DSP_HANDLED <<
420 select ARC_DSP_SAVE_RESTORE_REGS <<
421 help <<
422 DSP and AGU extensions presence in H <<
423 and AGU registers to run DSP-enabled <<
424 endchoice <<
425 435
426 config ARC_IRQ_NO_AUTOSAVE !! 436 config ALPHA_EV67
427 bool "Disable hardware autosave regfil !! 437 bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
428 default n !! 438 default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
429 help 439 help
430 On HS cores, taken interrupt auto sa !! 440 Is this a machine based on the EV67 core? If in doubt, select N here
431 This is programmable and can be opti !! 441 and the machine will be treated as an EV6.
432 software INTERRUPT_PROLOGUE/EPILGUE <<
433 <<
434 config ARC_LPB_DISABLE <<
435 bool "Disable loop buffer (LPB)" <<
436 help <<
437 On HS cores, loop buffer (LPB) is pr <<
438 be optionally disabled. <<
439 <<
440 endif # ISA_ARCV2 <<
441 <<
442 endmenu # "ARC CPU Configuration" <<
443 <<
444 config LINUX_LINK_BASE <<
445 hex "Kernel link address" <<
446 default "0x80000000" <<
447 help <<
448 ARC700 divides the 32 bit phy addres <<
449 -Lower 2G (0 - 0x7FFF_FFFF ) is user <<
450 -Upper 2G (0x8000_0000 onwards) is u <<
451 Typically Linux kernel is linked at <<
452 hence the default value of 0x8zs. <<
453 However some customers have peripher <<
454 Linux needs to be scooted a bit. <<
455 If you don't know what the above mea <<
456 This needs to match memory start add <<
457 <<
458 config LINUX_RAM_BASE <<
459 hex "RAM base address" <<
460 default LINUX_LINK_BASE <<
461 help <<
462 By default Linux is linked at base o <<
463 cases (such as HSDK), Linux can't be <<
464 this option. <<
465 <<
466 config HIGHMEM <<
467 bool "High Memory Support" <<
468 select HAVE_ARCH_PFN_VALID <<
469 select KMAP_LOCAL <<
470 help <<
471 With ARC 2G:2G address split, only u <<
472 kernel. Enable this to potentially a <<
473 in future <<
474 <<
475 config ARC_HAS_PAE40 <<
476 bool "Support for the 40-bit Physical <<
477 depends on ISA_ARCV2 <<
478 select HIGHMEM <<
479 select PHYS_ADDR_T_64BIT <<
480 help <<
481 Enable access to physical memory bey <<
482 ARC cores with 40 bit Physical Addre <<
483 <<
484 config ARC_KVADDR_SIZE <<
485 int "Kernel Virtual Address Space size <<
486 range 0 512 <<
487 default "256" <<
488 help <<
489 The kernel address space is carved o <<
490 space for catering to vmalloc, modul <<
491 not suffice vmalloc requirements of <<
492 this to be stretched to 512 MB (by e <<
493 kernel-user gutter) <<
494 <<
495 config ARC_CURR_IN_REG <<
496 bool "cache current task pointer in gp <<
497 default y <<
498 help <<
499 This reserves gp register to point t <<
500 kernel mode eliding memory access fo <<
501 <<
502 <<
503 config ARC_EMUL_UNALIGNED <<
504 bool "Emulate unaligned memory access <<
505 select SYSCTL_ARCH_UNALIGN_NO_WARN <<
506 select SYSCTL_ARCH_UNALIGN_ALLOW <<
507 depends on ISA_ARCOMPACT <<
508 help <<
509 This enables misaligned 16 & 32 bit <<
510 Use ONLY-IF-ABS-NECESSARY as it will <<
511 potential bugs in code <<
512 442
513 config HZ !! 443 config ALPHA_MCPCIA
514 int "Timer Frequency" !! 444 bool
515 default 100 !! 445 depends on ALPHA_RAWHIDE
>> 446 default y
516 447
517 config ARC_METAWARE_HLINK !! 448 config ALPHA_POLARIS
518 bool "Support for Metaware debugger as !! 449 bool
519 help !! 450 depends on ALPHA_RX164
520 This options allows a Linux userland !! 451 default y
521 host file system (open/creat/read/wr <<
522 Metaware Debugger. This can come in <<
523 when there is no real usable periphe <<
524 452
525 menuconfig ARC_DBG !! 453 config ALPHA_IRONGATE
526 bool "ARC debugging" !! 454 bool
>> 455 depends on ALPHA_NAUTILUS
527 default y 456 default y
528 457
529 if ARC_DBG !! 458 config GENERIC_HWEIGHT
>> 459 bool
>> 460 default y if !ALPHA_EV67
530 461
531 config ARC_DW2_UNWIND !! 462 config ALPHA_AVANTI
532 bool "Enable DWARF specific kernel sta !! 463 bool
>> 464 depends on ALPHA_XL || ALPHA_AVANTI_CH
533 default y 465 default y
534 select KALLSYMS <<
535 help 466 help
536 Compiles the kernel with DWARF unwin !! 467 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based
537 to get stack backtraces. !! 468 Alphas. Info at
>> 469 <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>.
538 470
539 If you say Y here the resulting kern !! 471 config ALPHA_BROKEN_IRQ_MASK
540 but not slower, and it will give ver !! 472 bool
541 If you don't debug the kernel, you c !! 473 depends on ALPHA_GENERIC || ALPHA_PC164
542 to solve problems without frame unwi !! 474 default y
543 475
544 config ARC_DBG_JUMP_LABEL !! 476 config VGA_HOSE
545 bool "Paranoid checks in Static Keys ( !! 477 bool
546 depends on JUMP_LABEL !! 478 depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI)
547 default y if STATIC_KEYS_SELFTEST !! 479 default y
548 help 480 help
549 Enable paranoid checks and self-test !! 481 Support VGA on an arbitrary hose; needed for several platforms
550 part of static keys (jump labels) re !! 482 which always have multiple hoses, and whose consoles support it.
551 endif <<
552 483
553 config ARC_BUILTIN_DTB_NAME <<
554 string "Built in DTB" <<
555 help <<
556 Set the name of the DTB to embed in <<
557 Leaving it blank selects the "nsim_7 <<
558 484
559 endmenu # "ARC Architecture Configuration" !! 485 config ALPHA_QEMU
>> 486 bool "Run under QEMU emulation"
>> 487 depends on !ALPHA_GENERIC
>> 488 ---help---
>> 489 Assume the presence of special features supported by QEMU PALcode
>> 490 that reduce the overhead of system emulation.
>> 491
>> 492 Generic kernels will auto-detect QEMU. But when building a
>> 493 system-specific kernel, the assumption is that we want to
>> 494 eliminate as many runtime tests as possible.
>> 495
>> 496 If unsure, say N.
>> 497
>> 498
>> 499 config ALPHA_SRM
>> 500 bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
>> 501 depends on TTY
>> 502 default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
>> 503 ---help---
>> 504 There are two different types of booting firmware on Alphas: SRM,
>> 505 which is command line driven, and ARC, which uses menus and arrow
>> 506 keys. Details about the Linux/Alpha booting process are contained in
>> 507 the Linux/Alpha FAQ, accessible on the WWW from
>> 508 <http://www.alphalinux.org/>.
>> 509
>> 510 The usual way to load Linux on an Alpha machine is to use MILO
>> 511 (a bootloader that lets you pass command line parameters to the
>> 512 kernel just like lilo does for the x86 architecture) which can be
>> 513 loaded either from ARC or can be installed directly as a permanent
>> 514 firmware replacement from floppy (which requires changing a certain
>> 515 jumper on the motherboard). If you want to do either of these, say N
>> 516 here. If MILO doesn't work on your system (true for Jensen
>> 517 motherboards), you can bypass it altogether and boot Linux directly
>> 518 from an SRM console; say Y here in order to do that. Note that you
>> 519 won't be able to boot from an IDE disk using SRM.
>> 520
>> 521 If unsure, say N.
>> 522
>> 523 config ARCH_MAY_HAVE_PC_FDC
>> 524 def_bool y
>> 525
>> 526 config SMP
>> 527 bool "Symmetric multi-processing support"
>> 528 depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
>> 529 ---help---
>> 530 This enables support for systems with more than one CPU. If you have
>> 531 a system with only one CPU, say N. If you have a system with more
>> 532 than one CPU, say Y.
>> 533
>> 534 If you say N here, the kernel will run on uni- and multiprocessor
>> 535 machines, but will use only one CPU of a multiprocessor machine. If
>> 536 you say Y here, the kernel will run on many, but not all,
>> 537 uniprocessor machines. On a uniprocessor machine, the kernel
>> 538 will run faster if you say N here.
560 539
561 config ARCH_FORCE_MAX_ORDER !! 540 See also the SMP-HOWTO available at
562 int "Maximum zone order" !! 541 <http://www.tldp.org/docs.html#howto>.
563 default "11" if ARC_HUGEPAGE_16M <<
564 default "10" <<
565 542
566 source "kernel/power/Kconfig" !! 543 If you don't know what to do here, say N.
>> 544
>> 545 config NR_CPUS
>> 546 int "Maximum number of CPUs (2-32)"
>> 547 range 2 32
>> 548 depends on SMP
>> 549 default "32" if ALPHA_GENERIC || ALPHA_MARVEL
>> 550 default "4" if !ALPHA_GENERIC && !ALPHA_MARVEL
>> 551 help
>> 552 MARVEL support can handle a maximum of 32 CPUs, all the others
>> 553 with working support have a maximum of 4 CPUs.
>> 554
>> 555 config ARCH_DISCONTIGMEM_ENABLE
>> 556 bool "Discontiguous Memory Support"
>> 557 help
>> 558 Say Y to support efficient handling of discontiguous physical memory,
>> 559 for architectures which are either NUMA (Non-Uniform Memory Access)
>> 560 or have huge holes in the physical address space for other reasons.
>> 561 See <file:Documentation/vm/numa.rst> for more.
>> 562
>> 563 config NUMA
>> 564 bool "NUMA Support (EXPERIMENTAL)"
>> 565 depends on DISCONTIGMEM && BROKEN
>> 566 help
>> 567 Say Y to compile the kernel to support NUMA (Non-Uniform Memory
>> 568 Access). This option is for configuring high-end multiprocessor
>> 569 server machines. If in doubt, say N.
>> 570
>> 571 config ALPHA_WTINT
>> 572 bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
>> 573 default y if ALPHA_QEMU
>> 574 default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA)
>> 575 default n if !ALPHA_SRM && !ALPHA_GENERIC
>> 576 default y if SMP
>> 577 ---help---
>> 578 The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
>> 579 to sleep until the next interrupt. This may reduce the power
>> 580 consumed, and the heat produced by the computer. However, it has
>> 581 the side effect of making the cycle counter unreliable as a timing
>> 582 device across the sleep.
>> 583
>> 584 For emulation under QEMU, definitely say Y here, as we have other
>> 585 mechanisms for measuring time than the cycle counter.
>> 586
>> 587 For EV4 (but not LCA), EV5 and EV56 systems, or for systems running
>> 588 MILO, sleep mode is not supported so you might as well say N here.
>> 589
>> 590 For SMP systems we cannot use the cycle counter for timing anyway,
>> 591 so you might as well say Y here.
>> 592
>> 593 If unsure, say N.
>> 594
>> 595 config NODES_SHIFT
>> 596 int
>> 597 default "7"
>> 598 depends on NEED_MULTIPLE_NODES
>> 599
>> 600 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
>> 601 config ALPHA_LARGE_VMALLOC
>> 602 bool
>> 603 ---help---
>> 604 Process creation and other aspects of virtual memory management can
>> 605 be streamlined if we restrict the kernel to one PGD for all vmalloc
>> 606 allocations. This equates to about 8GB.
>> 607
>> 608 Under normal circumstances, this is so far and above what is needed
>> 609 as to be laughable. However, there are certain applications (such
>> 610 as benchmark-grade in-kernel web serving) that can make use of as
>> 611 much vmalloc space as is available.
>> 612
>> 613 Say N unless you know you need gobs and gobs of vmalloc space.
>> 614
>> 615 config VERBOSE_MCHECK
>> 616 bool "Verbose Machine Checks"
>> 617
>> 618 config VERBOSE_MCHECK_ON
>> 619 int "Verbose Printing Mode (0=off, 1=on, 2=all)"
>> 620 depends on VERBOSE_MCHECK
>> 621 default 1
>> 622 ---help---
>> 623 This option allows the default printing mode to be set, and then
>> 624 possibly overridden by a boot command argument.
>> 625
>> 626 For example, if one wanted the option of printing verbose
>> 627 machine checks, but wanted the default to be as if verbose
>> 628 machine check printing was turned off, then one would choose
>> 629 the printing mode to be 0. Then, upon reboot, one could add
>> 630 the boot command line "verbose_mcheck=1" to get the normal
>> 631 verbose machine check printing, or "verbose_mcheck=2" to get
>> 632 the maximum information available.
>> 633
>> 634 Take the default (1) unless you want more control or more info.
>> 635
>> 636 choice
>> 637 prompt "Timer interrupt frequency (HZ)?"
>> 638 default HZ_128 if ALPHA_QEMU
>> 639 default HZ_1200 if ALPHA_RAWHIDE
>> 640 default HZ_1024
>> 641 ---help---
>> 642 The frequency at which timer interrupts occur. A high frequency
>> 643 minimizes latency, whereas a low frequency minimizes overhead of
>> 644 process accounting. The later effect is especially significant
>> 645 when being run under QEMU.
>> 646
>> 647 Note that some Alpha hardware cannot change the interrupt frequency
>> 648 of the timer. If unsure, say 1024 (or 1200 for Rawhide).
>> 649
>> 650 config HZ_32
>> 651 bool "32 Hz"
>> 652 config HZ_64
>> 653 bool "64 Hz"
>> 654 config HZ_128
>> 655 bool "128 Hz"
>> 656 config HZ_256
>> 657 bool "256 Hz"
>> 658 config HZ_1024
>> 659 bool "1024 Hz"
>> 660 config HZ_1200
>> 661 bool "1200 Hz"
>> 662 endchoice
>> 663
>> 664 config HZ
>> 665 int
>> 666 default 32 if HZ_32
>> 667 default 64 if HZ_64
>> 668 default 128 if HZ_128
>> 669 default 256 if HZ_256
>> 670 default 1200 if HZ_1200
>> 671 default 1024
>> 672
>> 673 config SRM_ENV
>> 674 tristate "SRM environment through procfs"
>> 675 depends on PROC_FS
>> 676 ---help---
>> 677 If you enable this option, a subdirectory inside /proc called
>> 678 /proc/srm_environment will give you access to the all important
>> 679 SRM environment variables (those which have a name) and also
>> 680 to all others (by their internal number).
>> 681
>> 682 SRM is something like a BIOS for Alpha machines. There are some
>> 683 other such BIOSes, like AlphaBIOS, which this driver cannot
>> 684 support (hey, that's not SRM!).
>> 685
>> 686 Despite the fact that this driver doesn't work on all Alphas (but
>> 687 only on those which have SRM as their firmware), it's save to
>> 688 build it even if your particular machine doesn't know about SRM
>> 689 (or if you intend to compile a generic kernel). It will simply
>> 690 not create those subdirectory in /proc (and give you some warning,
>> 691 of course).
>> 692
>> 693 This driver is also available as a module and will be called
>> 694 srm_env then.
>> 695
>> 696 endmenu
>> 697
>> 698 # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
>> 699 # but we also need it if VGA_HOSE is set
>> 700 config DUMMY_CONSOLE
>> 701 bool
>> 702 depends on VGA_HOSE
>> 703 default y
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