1 # SPDX-License-Identifier: GPL-2.0 !! 1 menu "Kernel hacking"
2 2
3 config DEBUG_DCFLUSH !! 3 config TRACE_IRQFLAGS_SUPPORT
4 bool "D-cache flush debugging" <<
5 depends on SPARC64 && DEBUG_KERNEL <<
6 <<
7 config MCOUNT <<
8 bool 4 bool
9 depends on SPARC64 <<
10 depends on FUNCTION_TRACER <<
11 select ARCH_WANT_FRAME_POINTERS <<
12 select FRAME_POINTER <<
13 default y 5 default y
14 6
15 config HAVE_HARDLOCKUP_DETECTOR_SPARC64 !! 7 source "lib/Kconfig.debug"
16 bool !! 8
17 depends on HAVE_NMI !! 9 config EARLY_PRINTK
18 select HARDLOCKUP_DETECTOR_SPARC64 !! 10 bool "Early printk" if EXPERT
>> 11 depends on SYS_HAS_EARLY_PRINTK
>> 12 default y
19 help 13 help
20 Sparc64 hardlockup detector is the l !! 14 This option enables special console drivers which allow the kernel
21 the common infrastructure for handli !! 15 to print messages very early in the bootup process.
22 always built. It does _not_ use the <<
23 and sysctl interface, except for /pr <<
24 16
25 config HARDLOCKUP_DETECTOR_SPARC64 !! 17 This is useful for kernel debugging when your machine crashes very
26 bool !! 18 early before the console code is initialized. For normal operation,
27 depends on HAVE_HARDLOCKUP_DETECTOR_SP !! 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
>> 99 help
>> 100 If you say Y here, some debugging macros will do run-time checking.
>> 101 If you say N here, those macros will mostly turn to no-ops. See
>> 102 arch/mips/include/asm/debug.h for debugging macros.
>> 103 If unsure, say N.
>> 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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