arch/mips/Kconfig.debug

   1 # SPDX-License-Identifier: GPL-2.0
   2 menu "Kernel hacking"
   3
   4 config TRACE_IRQFLAGS_SUPPORT
   5         bool
   6         default y
   7
   8 source "lib/Kconfig.debug"
   9
  10 config EARLY_PRINTK
  11         bool "Early printk" if EXPERT
  12         depends on SYS_HAS_EARLY_PRINTK
  13         default y
  14         help
  15           This option enables special console drivers which allow the kernel
  16           to print messages very early in the bootup process.
  17
  18           This is useful for kernel debugging when your machine crashes very
  19           early before the console code is initialized. For normal operation,
  20           it is not recommended because it looks ugly on some machines and
  21           doesn't cooperate with an X server. You should normally say N here,
  22           unless you want to debug such a crash.
  23
  24 config EARLY_PRINTK_8250
  25         bool
  26         depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
  27         default y
  28         help
  29           "8250/16550 and compatible serial early printk driver"
  30           If you say Y here, it will be possible to use a 8250/16550 serial
  31           port as the boot console.
  32
  33 config USE_GENERIC_EARLY_PRINTK_8250
  34         bool
  35
  36 config CMDLINE_BOOL
  37         bool "Built-in kernel command line"
  38         default n
  39         help
  40           For most systems, it is firmware or second stage bootloader that
  41           by default specifies the kernel command line options.  However,
  42           it might be necessary or advantageous to either override the
  43           default kernel command line or add a few extra options to it.
  44           For such cases, this option allows you to hardcode your own
  45           command line options directly into the kernel.  For that, you
  46           should choose 'Y' here, and fill in the extra boot arguments
  47           in CONFIG_CMDLINE.
  48
  49           The built-in options will be concatenated to the default command
  50           line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
  51           command line will be ignored and replaced by the built-in string.
  52
  53           Most MIPS systems will normally expect 'N' here and rely upon
  54           the command line from the firmware or the second-stage bootloader.
  55
  56 config CMDLINE
  57         string "Default kernel command string"
  58         depends on CMDLINE_BOOL
  59         default ""
  60         help
  61           On some platforms, there is currently no way for the boot loader to
  62           pass arguments to the kernel.  For these platforms, and for the cases
  63           when you want to add some extra options to the command line or ignore
  64           the default command line, you can supply some command-line options at
  65           build time by entering them here.  In other cases you can specify
  66           kernel args so that you don't have to set them up in board prom
  67           initialization routines.
  68
  69           For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
  70           options.
  71
  72 config CMDLINE_OVERRIDE
  73         bool "Built-in command line overrides firmware arguments"
  74         default n
  75         depends on CMDLINE_BOOL
  76         help
  77           By setting this option to 'Y' you will have your kernel ignore
  78           command line arguments from firmware or second stage bootloader.
  79           Instead, the built-in command line will be used exclusively.
  80
  81           Normally, you will choose 'N' here.
  82
  83 config SB1XXX_CORELIS
  84         bool "Corelis Debugger"
  85         depends on SIBYTE_SB1xxx_SOC
  86         select DEBUG_INFO if !COMPILE_TEST
  87         help
  88           Select compile flags that produce code that can be processed by the
  89           Corelis mksym utility and UDB Emulator.
  90
  91 config DEBUG_ZBOOT
  92         bool "Enable compressed kernel support debugging"
  93         depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
  94         default n
  95         help
  96           If you want to add compressed kernel support to a new board, and the
  97           board supports uart16550 compatible serial port, please select
  98           SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
  99           debug it.
 100
 101           If your board doesn't support uart16550 compatible serial port, you
 102           can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
 103           debug it. for example, add a new serial port support just as
 104           arch/mips/boot/compressed/uart-16550.c does.
 105
 106           After the compressed kernel support works, please disable this option
 107           to reduce the kernel image size and speed up the booting procedure a
 108           little.
 109
 110 config SPINLOCK_TEST
 111         bool "Enable spinlock timing tests in debugfs"
 112         depends on DEBUG_FS
 113         default n
 114         help
 115           Add several files to the debugfs to test spinlock speed.
 116
 117 config SCACHE_DEBUGFS
 118         bool "L2 cache debugfs entries"
 119         depends on DEBUG_FS
 120         help
 121           Enable this to allow parts of the L2 cache configuration, such as
 122           whether or not prefetching is enabled, to be exposed to userland
 123           via debugfs.
 124
 125           If unsure, say N.
 126
 127 menuconfig MIPS_CPS_NS16550
 128         bool "CPS SMP NS16550 UART output"
 129         depends on MIPS_CPS
 130         help
 131           Output debug information via an ns16550 compatible UART if exceptions
 132           occur early in the boot process of a secondary core.
 133
 134 if MIPS_CPS_NS16550
 135
 136 config MIPS_CPS_NS16550_BASE
 137         hex "UART Base Address"
 138         default 0x1b0003f8 if MIPS_MALTA
 139         help
 140           The base address of the ns16550 compatible UART on which to output
 141           debug information from the early stages of core startup.
 142
 143 config MIPS_CPS_NS16550_SHIFT
 144         int "UART Register Shift"
 145         default 0 if MIPS_MALTA
 146         help
 147           The number of bits to shift ns16550 register indices by in order to
 148           form their addresses. That is, log base 2 of the span between
 149           adjacent ns16550 registers in the system.
 150
 151 endif # MIPS_CPS_NS16550
 152
 153 endmenu