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 EARLY_PRINTK_8250 24 bool "8250/16550 and compatible serial early printk driver" 25 depends on EARLY_PRINTK 26 default n 27 help 28 If you say Y here, it will be possible to use a 8250/16550 serial 29 port as the boot console. 30 31config CMDLINE_BOOL 32 bool "Built-in kernel command line" 33 default n 34 help 35 For most systems, it is firmware or second stage bootloader that 36 by default specifies the kernel command line options. However, 37 it might be necessary or advantageous to either override the 38 default kernel command line or add a few extra options to it. 39 For such cases, this option allows you to hardcode your own 40 command line options directly into the kernel. For that, you 41 should choose 'Y' here, and fill in the extra boot arguments 42 in CONFIG_CMDLINE. 43 44 The built-in options will be concatenated to the default command 45 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default 46 command line will be ignored and replaced by the built-in string. 47 48 Most MIPS systems will normally expect 'N' here and rely upon 49 the command line from the firmware or the second-stage bootloader. 50 51config CMDLINE 52 string "Default kernel command string" 53 depends on CMDLINE_BOOL 54 default "" 55 help 56 On some platforms, there is currently no way for the boot loader to 57 pass arguments to the kernel. For these platforms, and for the cases 58 when you want to add some extra options to the command line or ignore 59 the default command line, you can supply some command-line options at 60 build time by entering them here. In other cases you can specify 61 kernel args so that you don't have to set them up in board prom 62 initialization routines. 63 64 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE 65 options. 66 67config CMDLINE_OVERRIDE 68 bool "Built-in command line overrides firmware arguments" 69 default n 70 depends on CMDLINE_BOOL 71 help 72 By setting this option to 'Y' you will have your kernel ignore 73 command line arguments from firmware or second stage bootloader. 74 Instead, the built-in command line will be used exclusively. 75 76 Normally, you will choose 'N' here. 77 78config SMTC_IDLE_HOOK_DEBUG 79 bool "Enable additional debug checks before going into CPU idle loop" 80 depends on DEBUG_KERNEL && MIPS_MT_SMTC 81 help 82 This option enables Enable additional debug checks before going into 83 CPU idle loop. For details on these checks, see 84 arch/mips/kernel/smtc.c. This debugging option result in significant 85 overhead so should be disabled in production kernels. 86 87config SB1XXX_CORELIS 88 bool "Corelis Debugger" 89 depends on SIBYTE_SB1xxx_SOC 90 select DEBUG_INFO 91 help 92 Select compile flags that produce code that can be processed by the 93 Corelis mksym utility and UDB Emulator. 94 95config RUNTIME_DEBUG 96 bool "Enable run-time debugging" 97 depends on DEBUG_KERNEL 98 help 99 If you say Y here, some debugging macros will do run-time checking. 100 If you say N here, those macros will mostly turn to no-ops. See 101 arch/mips/include/asm/debug.h for debugging macros. 102 If unsure, say N. 103 104config DEBUG_ZBOOT 105 bool "Enable compressed kernel support debugging" 106 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT 107 default n 108 help 109 If you want to add compressed kernel support to a new board, and the 110 board supports uart16550 compatible serial port, please select 111 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to 112 debug it. 113 114 If your board doesn't support uart16550 compatible serial port, you 115 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to 116 debug it. for example, add a new serial port support just as 117 arch/mips/boot/compressed/uart-16550.c does. 118 119 After the compressed kernel support works, please disable this option 120 to reduce the kernel image size and speed up the booting procedure a 121 little. 122 123config SPINLOCK_TEST 124 bool "Enable spinlock timing tests in debugfs" 125 depends on DEBUG_FS 126 default n 127 help 128 Add several files to the debugfs to test spinlock speed. 129 130endmenu 131