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  1 menu "Kernel hacking"
  4         bool
  5         default y
  7 source "lib/Kconfig.debug"
  9 config 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.
 23 config 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.
 31 config 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.
 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.
 48           Most MIPS systems will normally expect 'N' here and rely upon
 49           the command line from the firmware or the second-stage bootloader.
 51 config 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.
 64           For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
 65           options.
 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.
 76           Normally, you will choose 'N' here.
 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.
 87 config 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.
 95 config 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.
104 config 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.
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.
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.
123 config 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.
130 endmenu

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