linux/arch/mips/Kconfig.debug
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   1# SPDX-License-Identifier: GPL-2.0
   2
   3config EARLY_PRINTK
   4        bool "Early printk" if EXPERT
   5        depends on SYS_HAS_EARLY_PRINTK
   6        default y
   7        help
   8          This option enables special console drivers which allow the kernel
   9          to print messages very early in the bootup process.
  10
  11          This is useful for kernel debugging when your machine crashes very
  12          early before the console code is initialized. For normal operation,
  13          it is not recommended because it looks ugly on some machines and
  14          doesn't cooperate with an X server. You should normally say N here,
  15          unless you want to debug such a crash.
  16
  17config EARLY_PRINTK_8250
  18        bool
  19        depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
  20        default y
  21        help
  22          "8250/16550 and compatible serial early printk driver"
  23          If you say Y here, it will be possible to use a 8250/16550 serial
  24          port as the boot console.
  25
  26config USE_GENERIC_EARLY_PRINTK_8250
  27        bool
  28
  29config CMDLINE_BOOL
  30        bool "Built-in kernel command line"
  31        help
  32          For most systems, it is firmware or second stage bootloader that
  33          by default specifies the kernel command line options.  However,
  34          it might be necessary or advantageous to either override the
  35          default kernel command line or add a few extra options to it.
  36          For such cases, this option allows you to hardcode your own
  37          command line options directly into the kernel.  For that, you
  38          should choose 'Y' here, and fill in the extra boot arguments
  39          in CONFIG_CMDLINE.
  40
  41          The built-in options will be concatenated to the default command
  42          line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
  43          command line will be ignored and replaced by the built-in string.
  44
  45          Most MIPS systems will normally expect 'N' here and rely upon
  46          the command line from the firmware or the second-stage bootloader.
  47
  48config CMDLINE
  49        string "Default kernel command string"
  50        depends on CMDLINE_BOOL
  51        help
  52          On some platforms, there is currently no way for the boot loader to
  53          pass arguments to the kernel.  For these platforms, and for the cases
  54          when you want to add some extra options to the command line or ignore
  55          the default command line, you can supply some command-line options at
  56          build time by entering them here.  In other cases you can specify
  57          kernel args so that you don't have to set them up in board prom
  58          initialization routines.
  59
  60          For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
  61          options.
  62
  63config CMDLINE_OVERRIDE
  64        bool "Built-in command line overrides firmware arguments"
  65        depends on CMDLINE_BOOL
  66        help
  67          By setting this option to 'Y' you will have your kernel ignore
  68          command line arguments from firmware or second stage bootloader.
  69          Instead, the built-in command line will be used exclusively.
  70
  71          Normally, you will choose 'N' here.
  72
  73config SB1XXX_CORELIS
  74        bool "Corelis Debugger"
  75        depends on SIBYTE_SB1xxx_SOC
  76        select DEBUG_KERNEL if !COMPILE_TEST
  77        select DEBUG_INFO if !COMPILE_TEST
  78        help
  79          Select compile flags that produce code that can be processed by the
  80          Corelis mksym utility and UDB Emulator.
  81
  82config DEBUG_ZBOOT
  83        bool "Enable compressed kernel support debugging"
  84        depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
  85        default n
  86        help
  87          If you want to add compressed kernel support to a new board, and the
  88          board supports uart16550 compatible serial port, please select
  89          SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
  90          debug it.
  91
  92          If your board doesn't support uart16550 compatible serial port, you
  93          can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
  94          debug it. for example, add a new serial port support just as
  95          arch/mips/boot/compressed/uart-16550.c does.
  96
  97          After the compressed kernel support works, please disable this option
  98          to reduce the kernel image size and speed up the booting procedure a
  99          little.
 100
 101config ZBOOT_INGENIC_UART
 102        int "UART to use for compressed kernel debugging"
 103        depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
 104        default 0
 105        range 0 4
 106        help
 107          Specify the UART that should be used for compressed kernel debugging.
 108
 109config 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.
 115
 116config SCACHE_DEBUGFS
 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.
 123
 124          If unsure, say N.
 125
 126menuconfig MIPS_CPS_NS16550_BOOL
 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.
 132
 133if MIPS_CPS_NS16550_BOOL
 134
 135config MIPS_CPS_NS16550
 136        def_bool MIPS_CPS_NS16550_BASE != 0
 137
 138config MIPS_CPS_NS16550_BASE
 139        hex "UART Base Address"
 140        default 0x1b0003f8 if MIPS_MALTA
 141        default 0
 142        help
 143          The base address of the ns16550 compatible UART on which to output
 144          debug information from the early stages of core startup.
 145
 146          This is only used if non-zero.
 147
 148config MIPS_CPS_NS16550_SHIFT
 149        int "UART Register Shift"
 150        default 0
 151        help
 152          The number of bits to shift ns16550 register indices by in order to
 153          form their addresses. That is, log base 2 of the span between
 154          adjacent ns16550 registers in the system.
 155
 156config MIPS_CPS_NS16550_WIDTH
 157        int "UART Register Width"
 158        default 1
 159        help
 160          ns16550 registers width. UART registers IO access methods will be
 161          selected in accordance with this parameter. By setting it to 1, 2 or
 162          4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
 163          instructions respectively. Any value not from that set activates
 164          lb/sb instructions.
 165
 166endif # MIPS_CPS_NS16550_BOOL
 167