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 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 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 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 70config SMTC_IDLE_HOOK_DEBUG 71 bool "Enable additional debug checks before going into CPU idle loop" 72 depends on DEBUG_KERNEL && MIPS_MT_SMTC 73 help 74 This option enables Enable additional debug checks before going into 75 CPU idle loop. For details on these checks, see 76 arch/mips/kernel/smtc.c. This debugging option result in significant 77 overhead so should be disabled in production kernels. 78 79config SB1XXX_CORELIS 80 bool "Corelis Debugger" 81 depends on SIBYTE_SB1xxx_SOC 82 select DEBUG_INFO 83 help 84 Select compile flags that produce code that can be processed by the 85 Corelis mksym utility and UDB Emulator. 86 87config RUNTIME_DEBUG 88 bool "Enable run-time debugging" 89 depends on DEBUG_KERNEL 90 help 91 If you say Y here, some debugging macros will do run-time checking. 92 If you say N here, those macros will mostly turn to no-ops. See 93 arch/mips/include/asm/debug.h for debugging macros. 94 If unsure, say N. 95 96config DEBUG_ZBOOT 97 bool "Enable compressed kernel support debugging" 98 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT 99 default n 100 help 101 If you want to add compressed kernel support to a new board, and the 102 board supports uart16550 compatible serial port, please select 103 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to 104 debug it. 105 106 If your board doesn't support uart16550 compatible serial port, you 107 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to 108 debug it. for example, add a new serial port support just as 109 arch/mips/boot/compressed/uart-16550.c does. 110 111 After the compressed kernel support works, please disable this option 112 to reduce the kernel image size and speed up the booting procedure a 113 little. 114 115config SPINLOCK_TEST 116 bool "Enable spinlock timing tests in debugfs" 117 depends on DEBUG_FS 118 default n 119 help 120 Add several files to the debugfs to test spinlock speed. 121 122endmenu 123