1menu "Kernel hacking"
   4        bool
   5        default y
   7source "lib/Kconfig.debug"
   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.
  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.
  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.
  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.
  40          Most MIPS systems will normally expect 'N' here and rely upon
  41          the command line from the firmware or the second-stage bootloader.
  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.
  56          For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
  57          options.
  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.
  68          Normally, you will choose 'N' here.
  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.
  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.
  86          This option will slow down process creation somewhat.
  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.
  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.
 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.
 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.
 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.
 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.
 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.