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Linus Torvalds1da177e2005-04-16 15:20:36 -07001menu "Kernel hacking"
2
Ralf Baechle192ef362006-07-07 14:07:18 +01003config TRACE_IRQFLAGS_SUPPORT
4 bool
5 default y
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007source "lib/Kconfig.debug"
8
Ralf Baechle4dd92e12009-12-17 01:57:30 +00009config EARLY_PRINTK
David Rientjes6a108a12011-01-20 14:44:16 -080010 bool "Early printk" if EXPERT
Ralf Baechle4dd92e12009-12-17 01:57:30 +000011 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
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020023config CMDLINE_BOOL
24 bool "Built-in kernel command line"
25 default n
26 help
27 For most systems, it is firmware or second stage bootloader that
28 by default specifies the kernel command line options. However,
29 it might be necessary or advantageous to either override the
30 default kernel command line or add a few extra options to it.
31 For such cases, this option allows you to hardcode your own
32 command line options directly into the kernel. For that, you
33 should choose 'Y' here, and fill in the extra boot arguments
34 in CONFIG_CMDLINE.
35
36 The built-in options will be concatenated to the default command
37 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
38 command line will be ignored and replaced by the built-in string.
39
40 Most MIPS systems will normally expect 'N' here and rely upon
41 the command line from the firmware or the second-stage bootloader.
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043config CMDLINE
44 string "Default kernel command string"
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020045 depends on CMDLINE_BOOL
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 default ""
47 help
Jan Altenberg3e7f9b822007-01-25 20:46:14 +010048 On some platforms, there is currently no way for the boot loader to
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020049 pass arguments to the kernel. For these platforms, and for the cases
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.
55
56 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
57 options.
58
59config CMDLINE_OVERRIDE
Masanari Iida6b2aac42012-04-14 00:14:11 +090060 bool "Built-in command line overrides firmware arguments"
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020061 default n
62 depends on CMDLINE_BOOL
63 help
64 By setting this option to 'Y' you will have your kernel ignore
65 command line arguments from firmware or second stage bootloader.
66 Instead, the built-in command line will be used exclusively.
67
68 Normally, you will choose 'N' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Ralf Baechle93490752007-07-05 17:39:48 +010070config SMTC_IDLE_HOOK_DEBUG
Ralf Baechlec68644d2007-02-26 20:46:34 +000071 bool "Enable additional debug checks before going into CPU idle loop"
72 depends on DEBUG_KERNEL && MIPS_MT_SMTC
73 help
74 This option enables Enable additional debug checks before going into
75 CPU idle loop. For details on these checks, see
76 arch/mips/kernel/smtc.c. This debugging option result in significant
77 overhead so should be disabled in production kernels.
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079config SB1XXX_CORELIS
80 bool "Corelis Debugger"
81 depends on SIBYTE_SB1xxx_SOC
82 select DEBUG_INFO
83 help
84 Select compile flags that produce code that can be processed by the
85 Corelis mksym utility and UDB Emulator.
86
87config RUNTIME_DEBUG
88 bool "Enable run-time debugging"
89 depends on DEBUG_KERNEL
90 help
91 If you say Y here, some debugging macros will do run-time checking.
92 If you say N here, those macros will mostly turn to no-ops. See
Dmitri Vorobiev00ace202008-12-10 22:38:36 +020093 arch/mips/include/asm/debug.h for debugging macros.
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 If unsure, say N.
95
Wu Zhangjinf86a69b2010-01-31 20:39:40 +080096config DEBUG_ZBOOT
97 bool "Enable compressed kernel support debugging"
98 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
99 default n
100 help
101 If you want to add compressed kernel support to a new board, and the
102 board supports uart16550 compatible serial port, please select
103 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
104 debug it.
105
106 If your board doesn't support uart16550 compatible serial port, you
107 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
108 debug it. for example, add a new serial port support just as
109 arch/mips/boot/compressed/uart-16550.c does.
110
111 After the compressed kernel support works, please disable this option
112 to reduce the kernel image size and speed up the booting procedure a
113 little.
114
David Daneybba90762010-02-16 15:26:35 -0800115config SPINLOCK_TEST
116 bool "Enable spinlock timing tests in debugfs"
117 depends on DEBUG_FS
118 default n
119 help
120 Add several files to the debugfs to test spinlock speed.
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122endmenu