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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
 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.
 33         bool
 35 config 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.
 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.
 52           Most MIPS systems will normally expect 'N' here and rely upon
 53           the command line from the firmware or the second-stage bootloader.
 55 config 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.
 68           For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
 69           options.
 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.
 80           Normally, you will choose 'N' here.
 82 config SB1XXX_CORELIS
 83         bool "Corelis Debugger"
 84         depends on SIBYTE_SB1xxx_SOC
 85         select DEBUG_INFO
 86         help
 87           Select compile flags that produce code that can be processed by the
 88           Corelis mksym utility and UDB Emulator.
 90 config DEBUG_ZBOOT
 91         bool "Enable compressed kernel support debugging"
 92         depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
 93         default n
 94         help
 95           If you want to add compressed kernel support to a new board, and the
 96           board supports uart16550 compatible serial port, please select
 97           SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
 98           debug it.
100           If your board doesn't support uart16550 compatible serial port, you
101           can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
102           debug it. for example, add a new serial port support just as
103           arch/mips/boot/compressed/uart-16550.c does.
105           After the compressed kernel support works, please disable this option
106           to reduce the kernel image size and speed up the booting procedure a
107           little.
109 config SPINLOCK_TEST
110         bool "Enable spinlock timing tests in debugfs"
111         depends on DEBUG_FS
112         default n
113         help
114           Add several files to the debugfs to test spinlock speed.
117         bool "L2 cache debugfs entries"
118         depends on DEBUG_FS
119         help
120           Enable this to allow parts of the L2 cache configuration, such as
121           whether or not prefetching is enabled, to be exposed to userland
122           via debugfs.
124           If unsure, say N.
126 menuconfig MIPS_CPS_NS16550
127         bool "CPS SMP NS16550 UART output"
128         depends on MIPS_CPS
129         help
130           Output debug information via an ns16550 compatible UART if exceptions
131           occur early in the boot process of a secondary core.
133 if MIPS_CPS_NS16550
135 config MIPS_CPS_NS16550_BASE
136         hex "UART Base Address"
137         default 0x1b0003f8 if MIPS_MALTA
138         help
139           The base address of the ns16550 compatible UART on which to output
140           debug information from the early stages of core startup.
142 config MIPS_CPS_NS16550_SHIFT
143         int "UART Register Shift"
144         default 0 if MIPS_MALTA
145         help
146           The number of bits to shift ns16550 register indices by in order to
147           form their addresses. That is, log base 2 of the span between
148           adjacent ns16550 registers in the system.
150 endif # MIPS_CPS_NS16550
152 endmenu

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