1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
3 config SH_STANDARD_BIOS !! 3 config EARLY_PRINTK
4 bool "Use LinuxSH standard BIOS" !! 4 bool "Early printk" if EXPERT
>> 5 depends on SYS_HAS_EARLY_PRINTK
>> 6 default y
>> 7 help
>> 8 This option enables special console drivers which allow the kernel
>> 9 to print messages very early in the bootup process.
>> 10
>> 11 This is useful for kernel debugging when your machine crashes very
>> 12 early before the console code is initialized. For normal operation,
>> 13 it is not recommended because it looks ugly on some machines and
>> 14 doesn't cooperate with an X server. You should normally say N here,
>> 15 unless you want to debug such a crash.
>> 16
>> 17 config EARLY_PRINTK_8250
>> 18 bool
>> 19 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
>> 20 default y
>> 21 help
>> 22 "8250/16550 and compatible serial early printk driver"
>> 23 If you say Y here, it will be possible to use a 8250/16550 serial
>> 24 port as the boot console.
>> 25
>> 26 config USE_GENERIC_EARLY_PRINTK_8250
>> 27 bool
>> 28
>> 29 config CMDLINE_BOOL
>> 30 bool "Built-in kernel command line"
>> 31 help
>> 32 For most systems, it is firmware or second stage bootloader that
>> 33 by default specifies the kernel command line options. However,
>> 34 it might be necessary or advantageous to either override the
>> 35 default kernel command line or add a few extra options to it.
>> 36 For such cases, this option allows you to hardcode your own
>> 37 command line options directly into the kernel. For that, you
>> 38 should choose 'Y' here, and fill in the extra boot arguments
>> 39 in CONFIG_CMDLINE.
>> 40
>> 41 The built-in options will be concatenated to the default command
>> 42 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
>> 43 command line will be ignored and replaced by the built-in string.
>> 44
>> 45 Most MIPS systems will normally expect 'N' here and rely upon
>> 46 the command line from the firmware or the second-stage bootloader.
>> 47
>> 48 config CMDLINE
>> 49 string "Default kernel command string"
>> 50 depends on CMDLINE_BOOL
>> 51 help
>> 52 On some platforms, there is currently no way for the boot loader to
>> 53 pass arguments to the kernel. For these platforms, and for the cases
>> 54 when you want to add some extra options to the command line or ignore
>> 55 the default command line, you can supply some command-line options at
>> 56 build time by entering them here. In other cases you can specify
>> 57 kernel args so that you don't have to set them up in board prom
>> 58 initialization routines.
>> 59
>> 60 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
>> 61 options.
>> 62
>> 63 config CMDLINE_OVERRIDE
>> 64 bool "Built-in command line overrides firmware arguments"
>> 65 depends on CMDLINE_BOOL
>> 66 help
>> 67 By setting this option to 'Y' you will have your kernel ignore
>> 68 command line arguments from firmware or second stage bootloader.
>> 69 Instead, the built-in command line will be used exclusively.
>> 70
>> 71 Normally, you will choose 'N' here.
>> 72
>> 73 config SB1XXX_CORELIS
>> 74 bool "Corelis Debugger"
>> 75 depends on SIBYTE_SB1xxx_SOC
>> 76 select DEBUG_KERNEL if !COMPILE_TEST
>> 77 select DEBUG_INFO if !COMPILE_TEST
>> 78 help
>> 79 Select compile flags that produce code that can be processed by the
>> 80 Corelis mksym utility and UDB Emulator.
>> 81
>> 82 config DEBUG_ZBOOT
>> 83 bool "Enable compressed kernel support debugging"
>> 84 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
>> 85 default n
5 help 86 help
6 Say Y here if your target has the gd !! 87 If you want to add compressed kernel support to a new board, and the
7 package from www.m17n.org (or any co !! 88 board supports uart16550 compatible serial port, please select
8 in FLASH or EPROM. The kernel will !! 89 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
9 boot for various housekeeping tasks !! 90 debug it.
10 write characters to a system console !! 91
11 on-board Ethernet interface, and shu !! 92 If your board doesn't support uart16550 compatible serial port, you
12 does not work with machines with an !! 93 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
13 mask ROM and no flash (WindowsCE mac !! 94 debug it. for example, add a new serial port support just as
14 If unsure, say N. !! 95 arch/mips/boot/compressed/uart-16550.c does.
>> 96
>> 97 After the compressed kernel support works, please disable this option
>> 98 to reduce the kernel image size and speed up the booting procedure a
>> 99 little.
>> 100
>> 101 config ZBOOT_INGENIC_UART
>> 102 int "UART to use for compressed kernel debugging"
>> 103 depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
>> 104 default 0
>> 105 range 0 4
>> 106 help
>> 107 Specify the UART that should be used for compressed kernel debugging.
>> 108
>> 109 config SPINLOCK_TEST
>> 110 bool "Enable spinlock timing tests in debugfs"
>> 111 depends on DEBUG_FS
>> 112 default n
>> 113 help
>> 114 Add several files to the debugfs to test spinlock speed.
15 115
16 config STACK_DEBUG !! 116 config SCACHE_DEBUGFS
17 bool "Check for stack overflows" !! 117 bool "L2 cache debugfs entries"
18 depends on DEBUG_KERNEL && PRINTK !! 118 depends on DEBUG_FS
19 help !! 119 help
20 This option will cause messages to b !! 120 Enable this to allow parts of the L2 cache configuration, such as
21 drops below a certain limit. Saying !! 121 whether or not prefetching is enabled, to be exposed to userland
22 every function call and will therefo !! 122 via debugfs.
23 performance hit. Most users should s <<
24 123
25 config EARLY_PRINTK !! 124 If unsure, say N.
26 bool "Early printk" !! 125
27 depends on SH_STANDARD_BIOS !! 126 menuconfig MIPS_CPS_NS16550_BOOL
>> 127 bool "CPS SMP NS16550 UART output"
>> 128 depends on MIPS_CPS
28 help 129 help
29 Say Y here to redirect kernel printk !! 130 Output debug information via an ns16550 compatible UART if exceptions
30 used by the SH-IPL bootloader, start !! 131 occur early in the boot process of a secondary core.
31 process and ending when the kernel's !! 132
32 This option is only useful while por !! 133 if MIPS_CPS_NS16550_BOOL
33 when the kernel may crash or hang be !! 134
34 initialised. If unsure, say N. !! 135 config MIPS_CPS_NS16550
35 !! 136 def_bool MIPS_CPS_NS16550_BASE != 0
36 config 4KSTACKS !! 137
37 bool "Use 4Kb for kernel stacks instea !! 138 config MIPS_CPS_NS16550_BASE
38 depends on DEBUG_KERNEL && (MMU || BRO !! 139 hex "UART Base Address"
39 help !! 140 default 0x1b0003f8 if MIPS_MALTA
40 If you say Y here the kernel will us !! 141 default 0
41 kernel stack attached to each proces <<
42 running more threads on a system and <<
43 on the VM subsystem for higher order <<
44 will also use IRQ stacks to compensa <<
45 <<
46 config IRQSTACKS <<
47 bool "Use separate kernel stacks when <<
48 depends on DEBUG_KERNEL && BROKEN <<
49 help <<
50 If you say Y here the kernel will us <<
51 for handling hard and soft interrupt <<
52 overflowing the process kernel stack <<
53 <<
54 config DUMP_CODE <<
55 bool "Show disassembly of nearby code <<
56 depends on DEBUG_KERNEL <<
57 default y if DEBUG_BUGVERBOSE <<
58 default n <<
59 help 142 help
60 This prints out a code trace of the !! 143 The base address of the ns16550 compatible UART on which to output
61 the faulting instruction as a debugg !! 144 debug information from the early stages of core startup.
62 the kernel in size a bit, most users !! 145
63 !! 146 This is only used if non-zero.
64 Those looking for more verbose debug !! 147
65 !! 148 config MIPS_CPS_NS16550_SHIFT
66 config DWARF_UNWINDER !! 149 int "UART Register Shift"
67 bool "Enable the DWARF unwinder for st !! 150 default 0
68 depends on DEBUG_KERNEL <<
69 select FRAME_POINTER <<
70 default n <<
71 help 151 help
72 Enabling this option will make stack !! 152 The number of bits to shift ns16550 register indices by in order to
73 the cost of an increase in overall k !! 153 form their addresses. That is, log base 2 of the span between
>> 154 adjacent ns16550 registers in the system.
74 155
75 config SH_NO_BSS_INIT !! 156 config MIPS_CPS_NS16550_WIDTH
76 bool "Avoid zeroing BSS (to speed-up s !! 157 int "UART Register Width"
77 depends on DEBUG_KERNEL !! 158 default 1
78 default n <<
79 help 159 help
80 If running in painfully slow environ !! 160 ns16550 registers width. UART registers IO access methods will be
81 simulation or from remote memory via !! 161 selected in accordance with this parameter. By setting it to 1, 2 or
82 can already be guaranteed to ber zer !! 162 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
83 !! 163 instructions respectively. Any value not from that set activates
84 For all other cases, say N. If this !! 164 lb/sb instructions.
85 you aren't sure, say N. !! 165
86 !! 166 endif # MIPS_CPS_NS16550_BOOL
87 config MCOUNT <<
88 def_bool y <<
89 depends on STACK_DEBUG || FUNCTION_TRA <<
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