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 25 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250 26 default y 27 help 28 "8250/16550 and compatible serial early printk driver" 29 If you say Y here, it will be possible to use a 8250/16550 serial 30 port as the boot console. 31 32config USE_GENERIC_EARLY_PRINTK_8250 33 bool 34 35config CMDLINE_BOOL 36 bool "Built-in kernel command line" 37 default n 38 help 39 For most systems, it is firmware or second stage bootloader that 40 by default specifies the kernel command line options. However, 41 it might be necessary or advantageous to either override the 42 default kernel command line or add a few extra options to it. 43 For such cases, this option allows you to hardcode your own 44 command line options directly into the kernel. For that, you 45 should choose 'Y' here, and fill in the extra boot arguments 46 in CONFIG_CMDLINE. 47 48 The built-in options will be concatenated to the default command 49 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default 50 command line will be ignored and replaced by the built-in string. 51 52 Most MIPS systems will normally expect 'N' here and rely upon 53 the command line from the firmware or the second-stage bootloader. 54 55config CMDLINE 56 string "Default kernel command string" 57 depends on CMDLINE_BOOL 58 default "" 59 help 60 On some platforms, there is currently no way for the boot loader to 61 pass arguments to the kernel. For these platforms, and for the cases 62 when you want to add some extra options to the command line or ignore 63 the default command line, you can supply some command-line options at 64 build time by entering them here. In other cases you can specify 65 kernel args so that you don't have to set them up in board prom 66 initialization routines. 67 68 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE 69 options. 70 71config CMDLINE_OVERRIDE 72 bool "Built-in command line overrides firmware arguments" 73 default n 74 depends on CMDLINE_BOOL 75 help 76 By setting this option to 'Y' you will have your kernel ignore 77 command line arguments from firmware or second stage bootloader. 78 Instead, the built-in command line will be used exclusively. 79 80 Normally, you will choose 'N' here. 81 82config SMTC_IDLE_HOOK_DEBUG 83 bool "Enable additional debug checks before going into CPU idle loop" 84 depends on DEBUG_KERNEL && MIPS_MT_SMTC 85 help 86 This option enables Enable additional debug checks before going into 87 CPU idle loop. For details on these checks, see 88 arch/mips/kernel/smtc.c. This debugging option result in significant 89 overhead so should be disabled in production kernels. 90 91config SB1XXX_CORELIS 92 bool "Corelis Debugger" 93 depends on SIBYTE_SB1xxx_SOC 94 select DEBUG_INFO 95 help 96 Select compile flags that produce code that can be processed by the 97 Corelis mksym utility and UDB Emulator. 98 99config RUNTIME_DEBUG 100 bool "Enable run-time debugging" 101 depends on DEBUG_KERNEL 102 help 103 If you say Y here, some debugging macros will do run-time checking. 104 If you say N here, those macros will mostly turn to no-ops. See 105 arch/mips/include/asm/debug.h for debugging macros. 106 If unsure, say N. 107 108config DEBUG_ZBOOT 109 bool "Enable compressed kernel support debugging" 110 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT 111 default n 112 help 113 If you want to add compressed kernel support to a new board, and the 114 board supports uart16550 compatible serial port, please select 115 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to 116 debug it. 117 118 If your board doesn't support uart16550 compatible serial port, you 119 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to 120 debug it. for example, add a new serial port support just as 121 arch/mips/boot/compressed/uart-16550.c does. 122 123 After the compressed kernel support works, please disable this option 124 to reduce the kernel image size and speed up the booting procedure a 125 little. 126 127config SPINLOCK_TEST 128 bool "Enable spinlock timing tests in debugfs" 129 depends on DEBUG_FS 130 default n 131 help 132 Add several files to the debugfs to test spinlock speed. 133 134endmenu 135