1# SPDX-License-Identifier: GPL-2.0
   4        bool
   5        default y
   7config EARLY_PRINTK
   8        bool "Early printk" if EXPERT
   9        depends on SYS_HAS_EARLY_PRINTK
  10        default y
  11        help
  12          This option enables special console drivers which allow the kernel
  13          to print messages very early in the bootup process.
  15          This is useful for kernel debugging when your machine crashes very
  16          early before the console code is initialized. For normal operation,
  17          it is not recommended because it looks ugly on some machines and
  18          doesn't cooperate with an X server. You should normally say N here,
  19          unless you want to debug such a crash.
  21config EARLY_PRINTK_8250
  22        bool
  23        depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
  24        default y
  25        help
  26          "8250/16550 and compatible serial early printk driver"
  27          If you say Y here, it will be possible to use a 8250/16550 serial
  28          port as the boot console.
  31        bool
  33config CMDLINE_BOOL
  34        bool "Built-in kernel command line"
  35        help
  36          For most systems, it is firmware or second stage bootloader that
  37          by default specifies the kernel command line options.  However,
  38          it might be necessary or advantageous to either override the
  39          default kernel command line or add a few extra options to it.
  40          For such cases, this option allows you to hardcode your own
  41          command line options directly into the kernel.  For that, you
  42          should choose 'Y' here, and fill in the extra boot arguments
  43          in CONFIG_CMDLINE.
  45          The built-in options will be concatenated to the default command
  46          line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
  47          command line will be ignored and replaced by the built-in string.
  49          Most MIPS systems will normally expect 'N' here and rely upon
  50          the command line from the firmware or the second-stage bootloader.
  52config CMDLINE
  53        string "Default kernel command string"
  54        depends on CMDLINE_BOOL
  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        depends on CMDLINE_BOOL
  70        help
  71          By setting this option to 'Y' you will have your kernel ignore
  72          command line arguments from firmware or second stage bootloader.
  73          Instead, the built-in command line will be used exclusively.
  75          Normally, you will choose 'N' here.
  77config SB1XXX_CORELIS
  78        bool "Corelis Debugger"
  79        depends on SIBYTE_SB1xxx_SOC
  80        select DEBUG_KERNEL if !COMPILE_TEST
  81        select DEBUG_INFO if !COMPILE_TEST
  82        help
  83          Select compile flags that produce code that can be processed by the
  84          Corelis mksym utility and UDB Emulator.
  86config DEBUG_ZBOOT
  87        bool "Enable compressed kernel support debugging"
  88        depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
  89        default n
  90        help
  91          If you want to add compressed kernel support to a new board, and the
  92          board supports uart16550 compatible serial port, please select
  93          SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
  94          debug it.
  96          If your board doesn't support uart16550 compatible serial port, you
  97          can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
  98          debug it. for example, add a new serial port support just as
  99          arch/mips/boot/compressed/uart-16550.c does.
 101          After the compressed kernel support works, please disable this option
 102          to reduce the kernel image size and speed up the booting procedure a
 103          little.
 106        int "UART to use for compressed kernel debugging"
 107        depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
 108        default 0
 109        range 0 4
 110        help
 111          Specify the UART that should be used for compressed kernel debugging.
 113config SPINLOCK_TEST
 114        bool "Enable spinlock timing tests in debugfs"
 115        depends on DEBUG_FS
 116        default n
 117        help
 118          Add several files to the debugfs to test spinlock speed.
 121        bool "L2 cache debugfs entries"
 122        depends on DEBUG_FS
 123        help
 124          Enable this to allow parts of the L2 cache configuration, such as
 125          whether or not prefetching is enabled, to be exposed to userland
 126          via debugfs.
 128          If unsure, say N.
 130menuconfig MIPS_CPS_NS16550_BOOL
 131        bool "CPS SMP NS16550 UART output"
 132        depends on MIPS_CPS
 133        help
 134          Output debug information via an ns16550 compatible UART if exceptions
 135          occur early in the boot process of a secondary core.
 137if MIPS_CPS_NS16550_BOOL
 139config MIPS_CPS_NS16550
 140        def_bool MIPS_CPS_NS16550_BASE != 0
 142config MIPS_CPS_NS16550_BASE
 143        hex "UART Base Address"
 144        default 0x1b0003f8 if MIPS_MALTA
 145        default 0
 146        help
 147          The base address of the ns16550 compatible UART on which to output
 148          debug information from the early stages of core startup.
 150          This is only used if non-zero.
 152config MIPS_CPS_NS16550_SHIFT
 153        int "UART Register Shift"
 154        default 0
 155        help
 156          The number of bits to shift ns16550 register indices by in order to
 157          form their addresses. That is, log base 2 of the span between
 158          adjacent ns16550 registers in the system.
 160config MIPS_CPS_NS16550_WIDTH
 161        int "UART Register Width"
 162        default 1
 163        help
 164          ns16550 registers width. UART registers IO access methods will be
 165          selected in accordance with this parameter. By setting it to 1, 2 or
 166          4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
 167          instructions respectively. Any value not from that set activates
 168          lb/sb instructions.
 170endif # MIPS_CPS_NS16550_BOOL