1 # SPDX-License-Identifier: GPL-2.0 !! 1 menu "Kernel hacking"
2 2
3 config DEBUG_TLB_SANITY !! 3 config TRACE_IRQFLAGS_SUPPORT
4 bool "Debug TLB sanity" !! 4 bool
5 depends on DEBUG_KERNEL && MMU !! 5 default y
6 help <<
7 Enable this to turn on TLB sanity ch <<
8 This check can spot missing TLB inva <<
9 premature page freeing. <<
10 6
11 If unsure, say N. !! 7 source "lib/Kconfig.debug"
12 8
13 config LD_NO_RELAX !! 9 config EARLY_PRINTK
14 bool "Disable linker relaxation" !! 10 bool "Early printk" if EXPERT
>> 11 depends on SYS_HAS_EARLY_PRINTK
15 default y 12 default y
16 help 13 help
17 Enable this function to disable link !! 14 This option enables special console drivers which allow the kernel
18 The default linker behavior is to co !! 15 to print messages very early in the bootup process.
19 values to reduce code size and remov <<
20 assembler-generated 'longcall' seque <<
21 Enabling this option improves the li <<
22 code size, and possibly execution ti <<
23 16
24 config S32C1I_SELFTEST !! 17 This is useful for kernel debugging when your machine crashes very
25 bool "Perform S32C1I instruction self- !! 18 early before the console code is initialized. For normal operation,
26 default y !! 19 it is not recommended because it looks ugly on some machines and
>> 20 doesn't cooperate with an X server. You should normally say N here,
>> 21 unless you want to debug such a crash.
>> 22
>> 23 config CMDLINE_BOOL
>> 24 bool "Built-in kernel command line"
>> 25 default n
>> 26 help
>> 27 For most systems, it is firmware or second stage bootloader that
>> 28 by default specifies the kernel command line options. However,
>> 29 it might be necessary or advantageous to either override the
>> 30 default kernel command line or add a few extra options to it.
>> 31 For such cases, this option allows you to hardcode your own
>> 32 command line options directly into the kernel. For that, you
>> 33 should choose 'Y' here, and fill in the extra boot arguments
>> 34 in CONFIG_CMDLINE.
>> 35
>> 36 The built-in options will be concatenated to the default command
>> 37 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
>> 38 command line will be ignored and replaced by the built-in string.
>> 39
>> 40 Most MIPS systems will normally expect 'N' here and rely upon
>> 41 the command line from the firmware or the second-stage bootloader.
>> 42
>> 43 config CMDLINE
>> 44 string "Default kernel command string"
>> 45 depends on CMDLINE_BOOL
>> 46 default ""
>> 47 help
>> 48 On some platforms, there is currently no way for the boot loader to
>> 49 pass arguments to the kernel. For these platforms, and for the cases
>> 50 when you want to add some extra options to the command line or ignore
>> 51 the default command line, you can supply some command-line options at
>> 52 build time by entering them here. In other cases you can specify
>> 53 kernel args so that you don't have to set them up in board prom
>> 54 initialization routines.
>> 55
>> 56 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
>> 57 options.
>> 58
>> 59 config CMDLINE_OVERRIDE
>> 60 bool "Built-in command line overrides firmware arguments"
>> 61 default n
>> 62 depends on CMDLINE_BOOL
>> 63 help
>> 64 By setting this option to 'Y' you will have your kernel ignore
>> 65 command line arguments from firmware or second stage bootloader.
>> 66 Instead, the built-in command line will be used exclusively.
>> 67
>> 68 Normally, you will choose 'N' here.
>> 69
>> 70 config DEBUG_STACKOVERFLOW
>> 71 bool "Check for stack overflows"
>> 72 depends on DEBUG_KERNEL
>> 73 help
>> 74 This option will cause messages to be printed if free stack space
>> 75 drops below a certain limit(2GB on MIPS). The debugging option
>> 76 provides another way to check stack overflow happened on kernel mode
>> 77 stack usually caused by nested interruption.
>> 78
>> 79 config SMTC_IDLE_HOOK_DEBUG
>> 80 bool "Enable additional debug checks before going into CPU idle loop"
>> 81 depends on DEBUG_KERNEL && MIPS_MT_SMTC
>> 82 help
>> 83 This option enables Enable additional debug checks before going into
>> 84 CPU idle loop. For details on these checks, see
>> 85 arch/mips/kernel/smtc.c. This debugging option result in significant
>> 86 overhead so should be disabled in production kernels.
>> 87
>> 88 config SB1XXX_CORELIS
>> 89 bool "Corelis Debugger"
>> 90 depends on SIBYTE_SB1xxx_SOC
>> 91 select DEBUG_INFO
27 help 92 help
28 Enable this option to test S32C1I in !! 93 Select compile flags that produce code that can be processed by the
29 Correct operation of this instructio !! 94 Corelis mksym utility and UDB Emulator.
30 external to the processor (such as b !! 95
31 It is easy to make wrong hardware co !! 96 config RUNTIME_DEBUG
32 !! 97 bool "Enable run-time debugging"
33 Say 'N' on stable hardware. !! 98 depends on DEBUG_KERNEL
34 !! 99 help
35 config PRINT_STACK_DEPTH !! 100 If you say Y here, some debugging macros will do run-time checking.
36 int "Stack depth to print" if DEBUG_KE !! 101 If you say N here, those macros will mostly turn to no-ops. See
37 default 64 !! 102 arch/mips/include/asm/debug.h for debugging macros.
38 help !! 103 If unsure, say N.
39 This option allows you to set the st !! 104
40 prints in stack traces. !! 105 config DEBUG_ZBOOT
41 !! 106 bool "Enable compressed kernel support debugging"
42 config PRINT_USER_CODE_ON_UNHANDLED_EXCEPTION !! 107 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
43 bool "Dump user code around unhandled !! 108 default n
44 help !! 109 help
45 Enable this option to display user c !! 110 If you want to add compressed kernel support to a new board, and the
46 exception (starting at address align !! 111 board supports uart16550 compatible serial port, please select
47 This may simplify finding faulting c !! 112 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
48 debug facilities. !! 113 debug it.
>> 114
>> 115 If your board doesn't support uart16550 compatible serial port, you
>> 116 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
>> 117 debug it. for example, add a new serial port support just as
>> 118 arch/mips/boot/compressed/uart-16550.c does.
>> 119
>> 120 After the compressed kernel support works, please disable this option
>> 121 to reduce the kernel image size and speed up the booting procedure a
>> 122 little.
>> 123
>> 124 config SPINLOCK_TEST
>> 125 bool "Enable spinlock timing tests in debugfs"
>> 126 depends on DEBUG_FS
>> 127 default n
>> 128 help
>> 129 Add several files to the debugfs to test spinlock speed.
>> 130
>> 131 endmenu
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