1 # SPDX-License-Identifier: GPL-2.0 !! 1 menu "Kernel hacking"
2 2
3 config SH_STANDARD_BIOS !! 3 config TRACE_IRQFLAGS_SUPPORT
4 bool "Use LinuxSH standard BIOS" !! 4 bool
5 help !! 5 default y
6 Say Y here if your target has the gd <<
7 package from www.m17n.org (or any co <<
8 in FLASH or EPROM. The kernel will <<
9 boot for various housekeeping tasks <<
10 write characters to a system console <<
11 on-board Ethernet interface, and shu <<
12 does not work with machines with an <<
13 mask ROM and no flash (WindowsCE mac <<
14 If unsure, say N. <<
15 6
16 config STACK_DEBUG !! 7 source "lib/Kconfig.debug"
17 bool "Check for stack overflows" <<
18 depends on DEBUG_KERNEL && PRINTK <<
19 help <<
20 This option will cause messages to b <<
21 drops below a certain limit. Saying <<
22 every function call and will therefo <<
23 performance hit. Most users should s <<
24 8
25 config EARLY_PRINTK 9 config EARLY_PRINTK
26 bool "Early printk" !! 10 bool "Early printk" if EXPERT
27 depends on SH_STANDARD_BIOS !! 11 depends on SYS_HAS_EARLY_PRINTK
>> 12 default y
>> 13 help
>> 14 This option enables special console drivers which allow the kernel
>> 15 to print messages very early in the bootup process.
>> 16
>> 17 This is useful for kernel debugging when your machine crashes very
>> 18 early before the console code is initialized. For normal operation,
>> 19 it is not recommended because it looks ugly on some machines and
>> 20 doesn't cooperate with an X server. You should normally say N here,
>> 21 unless you want to debug such a crash.
>> 22
>> 23 config CMDLINE_BOOL
>> 24 bool "Built-in kernel command line"
>> 25 default n
28 help 26 help
29 Say Y here to redirect kernel printk !! 27 For most systems, it is firmware or second stage bootloader that
30 used by the SH-IPL bootloader, start !! 28 by default specifies the kernel command line options. However,
31 process and ending when the kernel's !! 29 it might be necessary or advantageous to either override the
32 This option is only useful while por !! 30 default kernel command line or add a few extra options to it.
33 when the kernel may crash or hang be !! 31 For such cases, this option allows you to hardcode your own
34 initialised. If unsure, say N. !! 32 command line options directly into the kernel. For that, you
35 !! 33 should choose 'Y' here, and fill in the extra boot arguments
36 config 4KSTACKS !! 34 in CONFIG_CMDLINE.
37 bool "Use 4Kb for kernel stacks instea !! 35
38 depends on DEBUG_KERNEL && (MMU || BRO !! 36 The built-in options will be concatenated to the default command
39 help !! 37 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
40 If you say Y here the kernel will us !! 38 command line will be ignored and replaced by the built-in string.
41 kernel stack attached to each proces !! 39
42 running more threads on a system and !! 40 Most MIPS systems will normally expect 'N' here and rely upon
43 on the VM subsystem for higher order !! 41 the command line from the firmware or the second-stage bootloader.
44 will also use IRQ stacks to compensa !! 42
45 !! 43 config CMDLINE
46 config IRQSTACKS !! 44 string "Default kernel command string"
47 bool "Use separate kernel stacks when !! 45 depends on CMDLINE_BOOL
48 depends on DEBUG_KERNEL && BROKEN !! 46 default ""
49 help !! 47 help
50 If you say Y here the kernel will us !! 48 On some platforms, there is currently no way for the boot loader to
51 for handling hard and soft interrupt !! 49 pass arguments to the kernel. For these platforms, and for the cases
52 overflowing the process kernel stack !! 50 when you want to add some extra options to the command line or ignore
>> 51 the default command line, you can supply some command-line options at
>> 52 build time by entering them here. In other cases you can specify
>> 53 kernel args so that you don't have to set them up in board prom
>> 54 initialization routines.
53 55
54 config DUMP_CODE !! 56 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
55 bool "Show disassembly of nearby code !! 57 options.
56 depends on DEBUG_KERNEL !! 58
57 default y if DEBUG_BUGVERBOSE !! 59 config CMDLINE_OVERRIDE
>> 60 bool "Built-in command line overrides firmware arguments"
58 default n 61 default n
>> 62 depends on CMDLINE_BOOL
59 help 63 help
60 This prints out a code trace of the !! 64 By setting this option to 'Y' you will have your kernel ignore
61 the faulting instruction as a debugg !! 65 command line arguments from firmware or second stage bootloader.
62 the kernel in size a bit, most users !! 66 Instead, the built-in command line will be used exclusively.
63 67
64 Those looking for more verbose debug !! 68 Normally, you will choose 'N' here.
65 69
66 config DWARF_UNWINDER !! 70 config DEBUG_STACKOVERFLOW
67 bool "Enable the DWARF unwinder for st !! 71 bool "Check for stack overflows"
68 depends on DEBUG_KERNEL 72 depends on DEBUG_KERNEL
69 select FRAME_POINTER <<
70 default n <<
71 help 73 help
72 Enabling this option will make stack !! 74 This option will cause messages to be printed if free stack space
73 the cost of an increase in overall k !! 75 drops below a certain limit(2GB on MIPS). The debugging option
>> 76 provides another way to check stack overflow happened on kernel mode
>> 77 stack usually caused by nested interruption.
>> 78
>> 79 config SMTC_IDLE_HOOK_DEBUG
>> 80 bool "Enable additional debug checks before going into CPU idle loop"
>> 81 depends on DEBUG_KERNEL && MIPS_MT_SMTC
>> 82 help
>> 83 This option enables Enable additional debug checks before going into
>> 84 CPU idle loop. For details on these checks, see
>> 85 arch/mips/kernel/smtc.c. This debugging option result in significant
>> 86 overhead so should be disabled in production kernels.
>> 87
>> 88 config SB1XXX_CORELIS
>> 89 bool "Corelis Debugger"
>> 90 depends on SIBYTE_SB1xxx_SOC
>> 91 select DEBUG_INFO
>> 92 help
>> 93 Select compile flags that produce code that can be processed by the
>> 94 Corelis mksym utility and UDB Emulator.
74 95
75 config SH_NO_BSS_INIT !! 96 config RUNTIME_DEBUG
76 bool "Avoid zeroing BSS (to speed-up s !! 97 bool "Enable run-time debugging"
77 depends on DEBUG_KERNEL 98 depends on DEBUG_KERNEL
>> 99 help
>> 100 If you say Y here, some debugging macros will do run-time checking.
>> 101 If you say N here, those macros will mostly turn to no-ops. See
>> 102 arch/mips/include/asm/debug.h for debugging macros.
>> 103 If unsure, say N.
>> 104
>> 105 config DEBUG_ZBOOT
>> 106 bool "Enable compressed kernel support debugging"
>> 107 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
>> 108 default n
>> 109 help
>> 110 If you want to add compressed kernel support to a new board, and the
>> 111 board supports uart16550 compatible serial port, please select
>> 112 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
>> 113 debug it.
>> 114
>> 115 If your board doesn't support uart16550 compatible serial port, you
>> 116 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
>> 117 debug it. for example, add a new serial port support just as
>> 118 arch/mips/boot/compressed/uart-16550.c does.
>> 119
>> 120 After the compressed kernel support works, please disable this option
>> 121 to reduce the kernel image size and speed up the booting procedure a
>> 122 little.
>> 123
>> 124 config SPINLOCK_TEST
>> 125 bool "Enable spinlock timing tests in debugfs"
>> 126 depends on DEBUG_FS
78 default n 127 default n
79 help 128 help
80 If running in painfully slow environ !! 129 Add several files to the debugfs to test spinlock speed.
81 simulation or from remote memory via !! 130
82 can already be guaranteed to ber zer !! 131 endmenu
83 <<
84 For all other cases, say N. If this <<
85 you aren't sure, say N. <<
86 <<
87 config MCOUNT <<
88 def_bool y <<
89 depends on STACK_DEBUG || FUNCTION_TRA <<
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