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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
Yoichi Yuasa7cd93b82010-02-08 20:59:39 +090023config EARLY_PRINTK_8250
24 bool "8250/16550 and compatible serial early printk driver"
25 depends on EARLY_PRINTK
26 default n
27 help
28 If you say Y here, it will be possible to use a 8250/16550 serial
29 port as the boot console.
30
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020031config CMDLINE_BOOL
32 bool "Built-in kernel command line"
33 default n
34 help
35 For most systems, it is firmware or second stage bootloader that
36 by default specifies the kernel command line options. However,
37 it might be necessary or advantageous to either override the
38 default kernel command line or add a few extra options to it.
39 For such cases, this option allows you to hardcode your own
40 command line options directly into the kernel. For that, you
41 should choose 'Y' here, and fill in the extra boot arguments
42 in CONFIG_CMDLINE.
43
44 The built-in options will be concatenated to the default command
45 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
46 command line will be ignored and replaced by the built-in string.
47
48 Most MIPS systems will normally expect 'N' here and rely upon
49 the command line from the firmware or the second-stage bootloader.
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051config CMDLINE
52 string "Default kernel command string"
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020053 depends on CMDLINE_BOOL
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 default ""
55 help
Jan Altenberg3e7f9b822007-01-25 20:46:14 +010056 On some platforms, there is currently no way for the boot loader to
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020057 pass arguments to the kernel. For these platforms, and for the cases
58 when you want to add some extra options to the command line or ignore
59 the default command line, you can supply some command-line options at
60 build time by entering them here. In other cases you can specify
61 kernel args so that you don't have to set them up in board prom
62 initialization routines.
63
64 For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
65 options.
66
67config CMDLINE_OVERRIDE
Masanari Iida6b2aac42012-04-14 00:14:11 +090068 bool "Built-in command line overrides firmware arguments"
Dmitri Vorobiev6acc7d42009-11-21 22:34:41 +020069 default n
70 depends on CMDLINE_BOOL
71 help
72 By setting this option to 'Y' you will have your kernel ignore
73 command line arguments from firmware or second stage bootloader.
74 Instead, the built-in command line will be used exclusively.
75
76 Normally, you will choose 'N' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Ralf Baechle93490752007-07-05 17:39:48 +010078config SMTC_IDLE_HOOK_DEBUG
Ralf Baechlec68644d2007-02-26 20:46:34 +000079 bool "Enable additional debug checks before going into CPU idle loop"
80 depends on DEBUG_KERNEL && MIPS_MT_SMTC
81 help
82 This option enables Enable additional debug checks before going into
83 CPU idle loop. For details on these checks, see
84 arch/mips/kernel/smtc.c. This debugging option result in significant
85 overhead so should be disabled in production kernels.
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087config SB1XXX_CORELIS
88 bool "Corelis Debugger"
89 depends on SIBYTE_SB1xxx_SOC
90 select DEBUG_INFO
91 help
92 Select compile flags that produce code that can be processed by the
93 Corelis mksym utility and UDB Emulator.
94
95config RUNTIME_DEBUG
96 bool "Enable run-time debugging"
97 depends on DEBUG_KERNEL
98 help
99 If you say Y here, some debugging macros will do run-time checking.
100 If you say N here, those macros will mostly turn to no-ops. See
Dmitri Vorobiev00ace202008-12-10 22:38:36 +0200101 arch/mips/include/asm/debug.h for debugging macros.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 If unsure, say N.
103
Wu Zhangjinf86a69b2010-01-31 20:39:40 +0800104config DEBUG_ZBOOT
105 bool "Enable compressed kernel support debugging"
106 depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
107 default n
108 help
109 If you want to add compressed kernel support to a new board, and the
110 board supports uart16550 compatible serial port, please select
111 SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
112 debug it.
113
114 If your board doesn't support uart16550 compatible serial port, you
115 can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
116 debug it. for example, add a new serial port support just as
117 arch/mips/boot/compressed/uart-16550.c does.
118
119 After the compressed kernel support works, please disable this option
120 to reduce the kernel image size and speed up the booting procedure a
121 little.
122
David Daneybba90762010-02-16 15:26:35 -0800123config SPINLOCK_TEST
124 bool "Enable spinlock timing tests in debugfs"
125 depends on DEBUG_FS
126 default n
127 help
128 Add several files to the debugfs to test spinlock speed.
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130endmenu