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
28 help !! 12 default y
29 Say Y here to redirect kernel printk !! 13 help
30 used by the SH-IPL bootloader, start !! 14 This option enables special console drivers which allow the kernel
31 process and ending when the kernel's !! 15 to print messages very early in the bootup process.
32 This option is only useful while por !! 16
33 when the kernel may crash or hang be !! 17 This is useful for kernel debugging when your machine crashes very
34 initialised. If unsure, say N. !! 18 early before the console code is initialized. For normal operation,
35 !! 19 it is not recommended because it looks ugly on some machines and
36 config 4KSTACKS !! 20 doesn't cooperate with an X server. You should normally say N here,
37 bool "Use 4Kb for kernel stacks instea !! 21 unless you want to debug such a crash.
38 depends on DEBUG_KERNEL && (MMU || BRO !! 22
39 help !! 23 config EARLY_PRINTK_8250
40 If you say Y here the kernel will us !! 24 bool
41 kernel stack attached to each proces !! 25 depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
42 running more threads on a system and !! 26 default y
43 on the VM subsystem for higher order !! 27 help
44 will also use IRQ stacks to compensa !! 28 "8250/16550 and compatible serial early printk driver"
45 !! 29 If you say Y here, it will be possible to use a 8250/16550 serial
46 config IRQSTACKS !! 30 port as the boot console.
47 bool "Use separate kernel stacks when !! 31
48 depends on DEBUG_KERNEL && BROKEN !! 32 config USE_GENERIC_EARLY_PRINTK_8250
49 help !! 33 bool
50 If you say Y here the kernel will us !! 34
51 for handling hard and soft interrupt !! 35 config CMDLINE_BOOL
52 overflowing the process kernel stack !! 36 bool "Built-in kernel command line"
53 <<
54 config DUMP_CODE <<
55 bool "Show disassembly of nearby code <<
56 depends on DEBUG_KERNEL <<
57 default y if DEBUG_BUGVERBOSE <<
58 default n 37 default n
59 help 38 help
60 This prints out a code trace of the !! 39 For most systems, it is firmware or second stage bootloader that
61 the faulting instruction as a debugg !! 40 by default specifies the kernel command line options. However,
62 the kernel in size a bit, most users !! 41 it might be necessary or advantageous to either override the
63 !! 42 default kernel command line or add a few extra options to it.
64 Those looking for more verbose debug !! 43 For such cases, this option allows you to hardcode your own
65 !! 44 command line options directly into the kernel. For that, you
66 config DWARF_UNWINDER !! 45 should choose 'Y' here, and fill in the extra boot arguments
67 bool "Enable the DWARF unwinder for st !! 46 in CONFIG_CMDLINE.
68 depends on DEBUG_KERNEL !! 47
69 select FRAME_POINTER !! 48 The built-in options will be concatenated to the default command
>> 49 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
>> 50 command line will be ignored and replaced by the built-in string.
>> 51
>> 52 Most MIPS systems will normally expect 'N' here and rely upon
>> 53 the command line from the firmware or the second-stage bootloader.
>> 54
>> 55 config CMDLINE
>> 56 string "Default kernel command string"
>> 57 depends on CMDLINE_BOOL
>> 58 default ""
>> 59 help
>> 60 On some platforms, there is currently no way for the boot loader to
>> 61 pass arguments to the kernel. For these platforms, and for the cases
>> 62 when you want to add some extra options to the command line or ignore
>> 63 the default command line, you can supply some command-line options at
>> 64 build time by entering them here. In other cases you can specify
>> 65 kernel args so that you don't have to set them up in board prom
>> 66 initialization routines.
>> 67
>> 68 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
>> 69 options.
>> 70
>> 71 config CMDLINE_OVERRIDE
>> 72 bool "Built-in command line overrides firmware arguments"
70 default n 73 default n
>> 74 depends on CMDLINE_BOOL
>> 75 help
>> 76 By setting this option to 'Y' you will have your kernel ignore
>> 77 command line arguments from firmware or second stage bootloader.
>> 78 Instead, the built-in command line will be used exclusively.
>> 79
>> 80 Normally, you will choose 'N' here.
>> 81
>> 82 config SB1XXX_CORELIS
>> 83 bool "Corelis Debugger"
>> 84 depends on SIBYTE_SB1xxx_SOC
>> 85 select DEBUG_INFO if !COMPILE_TEST
71 help 86 help
72 Enabling this option will make stack !! 87 Select compile flags that produce code that can be processed by the
73 the cost of an increase in overall k !! 88 Corelis mksym utility and UDB Emulator.
74 89
75 config SH_NO_BSS_INIT !! 90 config DEBUG_ZBOOT
76 bool "Avoid zeroing BSS (to speed-up s !! 91 bool "Enable compressed kernel support debugging"
77 depends on DEBUG_KERNEL !! 92 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
>> 93 default n
>> 94 help
>> 95 If you want to add compressed kernel support to a new board, and the
>> 96 board supports uart16550 compatible serial port, please select
>> 97 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
>> 98 debug it.
>> 99
>> 100 If your board doesn't support uart16550 compatible serial port, you
>> 101 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
>> 102 debug it. for example, add a new serial port support just as
>> 103 arch/mips/boot/compressed/uart-16550.c does.
>> 104
>> 105 After the compressed kernel support works, please disable this option
>> 106 to reduce the kernel image size and speed up the booting procedure a
>> 107 little.
>> 108
>> 109 config SPINLOCK_TEST
>> 110 bool "Enable spinlock timing tests in debugfs"
>> 111 depends on DEBUG_FS
78 default n 112 default n
79 help 113 help
80 If running in painfully slow environ !! 114 Add several files to the debugfs to test spinlock speed.
81 simulation or from remote memory via !! 115
82 can already be guaranteed to ber zer !! 116 config SCACHE_DEBUGFS
83 !! 117 bool "L2 cache debugfs entries"
84 For all other cases, say N. If this !! 118 depends on DEBUG_FS
85 you aren't sure, say N. !! 119 help
86 !! 120 Enable this to allow parts of the L2 cache configuration, such as
87 config MCOUNT !! 121 whether or not prefetching is enabled, to be exposed to userland
88 def_bool y !! 122 via debugfs.
89 depends on STACK_DEBUG || FUNCTION_TRA !! 123
>> 124 If unsure, say N.
>> 125
>> 126 menuconfig MIPS_CPS_NS16550
>> 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
>> 134
>> 135 config MIPS_CPS_NS16550_BASE
>> 136 hex "UART Base Address"
>> 137 default 0x1b0003f8 if MIPS_MALTA
>> 138 help
>> 139 The base address of the ns16550 compatible UART on which to output
>> 140 debug information from the early stages of core startup.
>> 141
>> 142 config MIPS_CPS_NS16550_SHIFT
>> 143 int "UART Register Shift"
>> 144 default 0 if MIPS_MALTA
>> 145 help
>> 146 The number of bits to shift ns16550 register indices by in order to
>> 147 form their addresses. That is, log base 2 of the span between
>> 148 adjacent ns16550 registers in the system.
>> 149
>> 150 endif # MIPS_CPS_NS16550
>> 151
>> 152 endmenu
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