1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
>> 2 menu "Kernel hacking"
2 3
3 config DEBUG_TLB_SANITY !! 4 config TRACE_IRQFLAGS_SUPPORT
4 bool "Debug TLB sanity" !! 5 bool
5 depends on DEBUG_KERNEL && MMU !! 6 default y
6 help <<
7 Enable this to turn on TLB sanity ch <<
8 This check can spot missing TLB inva <<
9 premature page freeing. <<
10 7
11 If unsure, say N. !! 8 source "lib/Kconfig.debug"
12 9
13 config LD_NO_RELAX !! 10 config EARLY_PRINTK
14 bool "Disable linker relaxation" !! 11 bool "Early printk" if EXPERT
>> 12 depends on SYS_HAS_EARLY_PRINTK
15 default y 13 default y
16 help 14 help
17 Enable this function to disable link !! 15 This option enables special console drivers which allow the kernel
18 The default linker behavior is to co !! 16 to print messages very early in the bootup process.
19 values to reduce code size and remov <<
20 assembler-generated 'longcall' seque <<
21 Enabling this option improves the li <<
22 code size, and possibly execution ti <<
23 17
24 config S32C1I_SELFTEST !! 18 This is useful for kernel debugging when your machine crashes very
25 bool "Perform S32C1I instruction self- !! 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
26 default y 27 default y
27 help 28 help
28 Enable this option to test S32C1I in !! 29 "8250/16550 and compatible serial early printk driver"
29 Correct operation of this instructio !! 30 If you say Y here, it will be possible to use a 8250/16550 serial
30 external to the processor (such as b !! 31 port as the boot console.
31 It is easy to make wrong hardware co !! 32
32 !! 33 config USE_GENERIC_EARLY_PRINTK_8250
33 Say 'N' on stable hardware. !! 34 bool
34 !! 35
35 config PRINT_STACK_DEPTH !! 36 config CMDLINE_BOOL
36 int "Stack depth to print" if DEBUG_KE !! 37 bool "Built-in kernel command line"
37 default 64 !! 38 default n
38 help !! 39 help
39 This option allows you to set the st !! 40 For most systems, it is firmware or second stage bootloader that
40 prints in stack traces. !! 41 by default specifies the kernel command line options. However,
41 !! 42 it might be necessary or advantageous to either override the
42 config PRINT_USER_CODE_ON_UNHANDLED_EXCEPTION !! 43 default kernel command line or add a few extra options to it.
43 bool "Dump user code around unhandled !! 44 For such cases, this option allows you to hardcode your own
44 help !! 45 command line options directly into the kernel. For that, you
45 Enable this option to display user c !! 46 should choose 'Y' here, and fill in the extra boot arguments
46 exception (starting at address align !! 47 in CONFIG_CMDLINE.
47 This may simplify finding faulting c !! 48
48 debug facilities. !! 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.
>> 100
>> 101 If your board doesn't support uart16550 compatible serial port, you
>> 102 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
>> 103 debug it. for example, add a new serial port support just as
>> 104 arch/mips/boot/compressed/uart-16550.c does.
>> 105
>> 106 After the compressed kernel support works, please disable this option
>> 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.
>> 124
>> 125 If unsure, say N.
>> 126
>> 127 menuconfig MIPS_CPS_NS16550
>> 128 bool "CPS SMP NS16550 UART output"
>> 129 depends on MIPS_CPS
>> 130 help
>> 131 Output debug information via an ns16550 compatible UART if exceptions
>> 132 occur early in the boot process of a secondary core.
>> 133
>> 134 if MIPS_CPS_NS16550
>> 135
>> 136 config MIPS_CPS_NS16550_BASE
>> 137 hex "UART Base Address"
>> 138 default 0x1b0003f8 if MIPS_MALTA
>> 139 help
>> 140 The base address of the ns16550 compatible UART on which to output
>> 141 debug information from the early stages of core startup.
>> 142
>> 143 config MIPS_CPS_NS16550_SHIFT
>> 144 int "UART Register Shift"
>> 145 default 0 if MIPS_MALTA
>> 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 endif # MIPS_CPS_NS16550
>> 152
>> 153 endmenu
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