1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
3 config 16KSTACKS !! 3 config TRACE_IRQFLAGS_SUPPORT
4 bool "Use 16Kb for kernel stacks inste !! 4 bool
>> 5 default y
>> 6
>> 7 config EARLY_PRINTK
>> 8 bool "Early printk" if EXPERT
>> 9 depends on SYS_HAS_EARLY_PRINTK
>> 10 default y
5 help 11 help
6 If you say Y here the kernel will us !! 12 This option enables special console drivers which allow the kernel
7 kernel stack attached to each proces !! 13 to print messages very early in the bootup process.
8 This increases the resident kernel f !! 14
9 threads to run on the system and als !! 15 This is useful for kernel debugging when your machine crashes very
10 on the VM subsystem for higher order !! 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.
>> 20
>> 21 config 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.
>> 29
>> 30 config USE_GENERIC_EARLY_PRINTK_8250
>> 31 bool
>> 32
>> 33 config 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.
>> 44
>> 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.
>> 48
>> 49 Most MIPS systems will normally expect 'N' here and rely upon
>> 50 the command line from the firmware or the second-stage bootloader.
>> 51
>> 52 config 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.
>> 63
>> 64 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
>> 65 options.
>> 66
>> 67 config CMDLINE_OVERRIDE
>> 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.
>> 74
>> 75 Normally, you will choose 'N' here.
>> 76
>> 77 config SB1XXX_CORELIS
>> 78 bool "Corelis Debugger"
>> 79 depends on SIBYTE_SB1xxx_SOC
>> 80 select DEBUG_INFO if !COMPILE_TEST
>> 81 help
>> 82 Select compile flags that produce code that can be processed by the
>> 83 Corelis mksym utility and UDB Emulator.
>> 84
>> 85 config DEBUG_ZBOOT
>> 86 bool "Enable compressed kernel support debugging"
>> 87 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
>> 88 default n
>> 89 help
>> 90 If you want to add compressed kernel support to a new board, and the
>> 91 board supports uart16550 compatible serial port, please select
>> 92 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
>> 93 debug it.
>> 94
>> 95 If your board doesn't support uart16550 compatible serial port, you
>> 96 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
>> 97 debug it. for example, add a new serial port support just as
>> 98 arch/mips/boot/compressed/uart-16550.c does.
>> 99
>> 100 After the compressed kernel support works, please disable this option
>> 101 to reduce the kernel image size and speed up the booting procedure a
>> 102 little.
>> 103
>> 104 config SPINLOCK_TEST
>> 105 bool "Enable spinlock timing tests in debugfs"
>> 106 depends on DEBUG_FS
>> 107 default n
>> 108 help
>> 109 Add several files to the debugfs to test spinlock speed.
>> 110
>> 111 config SCACHE_DEBUGFS
>> 112 bool "L2 cache debugfs entries"
>> 113 depends on DEBUG_FS
>> 114 help
>> 115 Enable this to allow parts of the L2 cache configuration, such as
>> 116 whether or not prefetching is enabled, to be exposed to userland
>> 117 via debugfs.
>> 118
>> 119 If unsure, say N.
>> 120
>> 121 menuconfig MIPS_CPS_NS16550_BOOL
>> 122 bool "CPS SMP NS16550 UART output"
>> 123 depends on MIPS_CPS
>> 124 help
>> 125 Output debug information via an ns16550 compatible UART if exceptions
>> 126 occur early in the boot process of a secondary core.
>> 127
>> 128 if MIPS_CPS_NS16550_BOOL
>> 129
>> 130 config MIPS_CPS_NS16550
>> 131 def_bool MIPS_CPS_NS16550_BASE != 0
>> 132
>> 133 config MIPS_CPS_NS16550_BASE
>> 134 hex "UART Base Address"
>> 135 default 0x1b0003f8 if MIPS_MALTA
>> 136 default 0
>> 137 help
>> 138 The base address of the ns16550 compatible UART on which to output
>> 139 debug information from the early stages of core startup.
>> 140
>> 141 This is only used if non-zero.
>> 142
>> 143 config MIPS_CPS_NS16550_SHIFT
>> 144 int "UART Register Shift"
>> 145 default 0
>> 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 config MIPS_CPS_NS16550_WIDTH
>> 152 int "UART Register Width"
>> 153 default 1
>> 154 help
>> 155 ns16550 registers width. UART registers IO access methods will be
>> 156 selected in accordance with this parameter. By setting it to 1, 2 or
>> 157 4 UART registers will be accessed by means of lb/sb, lh/sh or lw/sw
>> 158 instructions respectively. Any value not from that set activates
>> 159 lb/sb instructions.
>> 160
>> 161 endif # MIPS_CPS_NS16550_BOOL
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.