1menu "Kernel hacking" 2 3config TRACE_IRQFLAGS_SUPPORT 4 bool 5 default y 6 7source "lib/Kconfig.debug" 8 9config EARLY_PRINTK 10 bool "Early printk" if EMBEDDED 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 23config 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 43config 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 59config CMDLINE_OVERRIDE 60 bool "Built-in command line overrides firware 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 70config 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 79config DEBUG_STACK_USAGE 80 bool "Enable stack utilization instrumentation" 81 depends on DEBUG_KERNEL 82 help 83 Enables the display of the minimum amount of free stack which each 84 task has ever had available in the sysrq-T and sysrq-P debug output. 85 86 This option will slow down process creation somewhat. 87 88config SMTC_IDLE_HOOK_DEBUG 89 bool "Enable additional debug checks before going into CPU idle loop" 90 depends on DEBUG_KERNEL && MIPS_MT_SMTC 91 help 92 This option enables Enable additional debug checks before going into 93 CPU idle loop. For details on these checks, see 94 arch/mips/kernel/smtc.c. This debugging option result in significant 95 overhead so should be disabled in production kernels. 96 97config SB1XXX_CORELIS 98 bool "Corelis Debugger" 99 depends on SIBYTE_SB1xxx_SOC 100 select DEBUG_INFO 101 help 102 Select compile flags that produce code that can be processed by the 103 Corelis mksym utility and UDB Emulator. 104 105config RUNTIME_DEBUG 106 bool "Enable run-time debugging" 107 depends on DEBUG_KERNEL 108 help 109 If you say Y here, some debugging macros will do run-time checking. 110 If you say N here, those macros will mostly turn to no-ops. See 111 arch/mips/include/asm/debug.h for debugging macros. 112 If unsure, say N. 113 114config DEBUG_ZBOOT 115 bool "Enable compressed kernel support debugging" 116 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT 117 default n 118 help 119 If you want to add compressed kernel support to a new board, and the 120 board supports uart16550 compatible serial port, please select 121 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to 122 debug it. 123 124 If your board doesn't support uart16550 compatible serial port, you 125 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to 126 debug it. for example, add a new serial port support just as 127 arch/mips/boot/compressed/uart-16550.c does. 128 129 After the compressed kernel support works, please disable this option 130 to reduce the kernel image size and speed up the booting procedure a 131 little. 132 133config SPINLOCK_TEST 134 bool "Enable spinlock timing tests in debugfs" 135 depends on DEBUG_FS 136 default n 137 help 138 Add several files to the debugfs to test spinlock speed. 139 140endmenu 141