1 # SPDX-License-Identifier: GPL-2.0 !! 1 menu "Kernel hacking"
2 2
3 config 16KSTACKS !! 3 config TRACE_IRQFLAGS_SUPPORT
4 bool "Use 16Kb for kernel stacks inste !! 4 bool
>> 5 default y
>> 6
>> 7 source "lib/Kconfig.debug"
>> 8
>> 9 config EARLY_PRINTK
>> 10 bool "Early printk" if EXPERT
>> 11 depends on SYS_HAS_EARLY_PRINTK
>> 12 default y
>> 13 help
>> 14 This option enables special console drivers which allow the kernel
>> 15 to print messages very early in the bootup process.
>> 16
>> 17 This is useful for kernel debugging when your machine crashes very
>> 18 early before the console code is initialized. For normal operation,
>> 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
>> 92 help
>> 93 Select compile flags that produce code that can be processed by the
>> 94 Corelis mksym utility and UDB Emulator.
>> 95
>> 96 config RUNTIME_DEBUG
>> 97 bool "Enable run-time debugging"
>> 98 depends on DEBUG_KERNEL
5 help 99 help
6 If you say Y here the kernel will us !! 100 If you say Y here, some debugging macros will do run-time checking.
7 kernel stack attached to each proces !! 101 If you say N here, those macros will mostly turn to no-ops. See
8 This increases the resident kernel f !! 102 arch/mips/include/asm/debug.h for debugging macros.
9 threads to run on the system and als !! 103 If unsure, say N.
10 on the VM subsystem for higher order !! 104
>> 105 config DEBUG_ZBOOT
>> 106 bool "Enable compressed kernel support debugging"
>> 107 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
>> 108 default n
>> 109 help
>> 110 If you want to add compressed kernel support to a new board, and the
>> 111 board supports uart16550 compatible serial port, please select
>> 112 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
>> 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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