1 # SPDX-License-Identifier: GPL-2.0 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"
2 9
3 config EARLY_PRINTK 10 config EARLY_PRINTK
4 def_bool y !! 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.
5 100
6 config DEBUG_ENTRY !! 101 If your board doesn't support uart16550 compatible serial port, you
7 bool "Debug low-level entry code" !! 102 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
8 depends on DEBUG_KERNEL !! 103 debug it. for example, add a new serial port support just as
9 help !! 104 arch/mips/boot/compressed/uart-16550.c does.
10 This option enables sanity checks in !! 105
11 Some of these sanity checks may slow !! 106 After the compressed kernel support works, please disable this option
12 exits or otherwise impact performanc !! 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.
13 124
14 If unsure, say N. 125 If unsure, say N.
15 126
16 config CIO_INJECT !! 127 menuconfig MIPS_CPS_NS16550_BOOL
17 bool "CIO Inject interfaces" !! 128 bool "CPS SMP NS16550 UART output"
18 depends on DEBUG_KERNEL && DEBUG_FS !! 129 depends on MIPS_CPS
19 help !! 130 help
20 This option provides a debugging fac !! 131 Output debug information via an ns16550 compatible UART if exceptions
21 and instruction responses to the CIO !! 132 occur early in the boot process of a secondary core.
22 debugfs user-interfaces will be at / !! 133
>> 134 if MIPS_CPS_NS16550_BOOL
>> 135
>> 136 config MIPS_CPS_NS16550
>> 137 def_bool MIPS_CPS_NS16550_BASE != 0
>> 138
>> 139 config MIPS_CPS_NS16550_BASE
>> 140 hex "UART Base Address"
>> 141 default 0x1b0003f8 if MIPS_MALTA
>> 142 default 0
>> 143 help
>> 144 The base address of the ns16550 compatible UART on which to output
>> 145 debug information from the early stages of core startup.
>> 146
>> 147 This is only used if non-zero.
>> 148
>> 149 config MIPS_CPS_NS16550_SHIFT
>> 150 int "UART Register Shift"
>> 151 default 0
>> 152 help
>> 153 The number of bits to shift ns16550 register indices by in order to
>> 154 form their addresses. That is, log base 2 of the span between
>> 155 adjacent ns16550 registers in the system.
>> 156
>> 157 endif # MIPS_CPS_NS16550_BOOL
>> 158
>> 159 endmenu
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