1 source "arch/riscv/kernel/tests/Kconfig.debug" !! 1 # SPDX-License-Identifier: GPL-2.0
>> 2
>> 3 config 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
>> 17 config 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
>> 26 config USE_GENERIC_EARLY_PRINTK_8250
>> 27 bool
>> 28
>> 29 config 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
>> 48 config 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
>> 63 config 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
>> 73 config 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
>> 82 config 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
>> 101 config 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
>> 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.
>> 115
>> 116 config 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
>> 126 menuconfig 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
>> 133 if MIPS_CPS_NS16550_BOOL
>> 134
>> 135 config MIPS_CPS_NS16550
>> 136 def_bool MIPS_CPS_NS16550_BASE != 0
>> 137
>> 138 config 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
>> 148 config 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
>> 156 config 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
>> 166 endif # MIPS_CPS_NS16550_BOOL
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