[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / mips / Kconfig.debug

menu "Kernel hacking"

config TRACE_IRQFLAGS_SUPPORT
	bool
	default y

source "lib/Kconfig.debug"

config EARLY_PRINTK
	bool "Early printk" if EMBEDDED
	depends on SYS_HAS_EARLY_PRINTK
	default y
	help
	  This option enables special console drivers which allow the kernel
	  to print messages very early in the bootup process.

	  This is useful for kernel debugging when your machine crashes very
	  early before the console code is initialized. For normal operation,
	  it is not recommended because it looks ugly on some machines and
	  doesn't cooperate with an X server. You should normally say N here,
	  unless you want to debug such a crash.

config CMDLINE_BOOL
	bool "Built-in kernel command line"
	default n
	help
	  For most systems, it is firmware or second stage bootloader that
	  by default specifies the kernel command line options.  However,
	  it might be necessary or advantageous to either override the
	  default kernel command line or add a few extra options to it.
	  For such cases, this option allows you to hardcode your own
	  command line options directly into the kernel.  For that, you
	  should choose 'Y' here, and fill in the extra boot arguments
	  in CONFIG_CMDLINE.

	  The built-in options will be concatenated to the default command
	  line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
	  command line will be ignored and replaced by the built-in string.

	  Most MIPS systems will normally expect 'N' here and rely upon
	  the command line from the firmware or the second-stage bootloader.

config CMDLINE
	string "Default kernel command string"
	depends on CMDLINE_BOOL
	default ""
	help
	  On some platforms, there is currently no way for the boot loader to
	  pass arguments to the kernel.  For these platforms, and for the cases
	  when you want to add some extra options to the command line or ignore
	  the default command line, you can supply some command-line options at
	  build time by entering them here.  In other cases you can specify
	  kernel args so that you don't have to set them up in board prom
	  initialization routines.

	  For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
	  options.

config CMDLINE_OVERRIDE
	bool "Built-in command line overrides firware arguments"
	default n
	depends on CMDLINE_BOOL
	help
	  By setting this option to 'Y' you will have your kernel ignore
	  command line arguments from firmware or second stage bootloader.
	  Instead, the built-in command line will be used exclusively.

	  Normally, you will choose 'N' here.

config DEBUG_STACKOVERFLOW
	bool "Check for stack overflows"
	depends on DEBUG_KERNEL
	help
	  This option will cause messages to be printed if free stack space
	  drops below a certain limit(2GB on MIPS). The debugging option
	  provides another way to check stack overflow happened on kernel mode
	  stack usually caused by nested interruption.

config DEBUG_STACK_USAGE
	bool "Enable stack utilization instrumentation"
	depends on DEBUG_KERNEL
	help
	  Enables the display of the minimum amount of free stack which each
	  task has ever had available in the sysrq-T and sysrq-P debug output.

	  This option will slow down process creation somewhat.

config SMTC_IDLE_HOOK_DEBUG
	bool "Enable additional debug checks before going into CPU idle loop"
	depends on DEBUG_KERNEL && MIPS_MT_SMTC
	help
	  This option enables Enable additional debug checks before going into
	  CPU idle loop.  For details on these checks, see
	  arch/mips/kernel/smtc.c.  This debugging option result in significant
	  overhead so should be disabled in production kernels.

config SB1XXX_CORELIS
	bool "Corelis Debugger"
	depends on SIBYTE_SB1xxx_SOC
	select DEBUG_INFO
	help
	  Select compile flags that produce code that can be processed by the
	  Corelis mksym utility and UDB Emulator.

config RUNTIME_DEBUG
	bool "Enable run-time debugging"
	depends on DEBUG_KERNEL
	help
	  If you say Y here, some debugging macros will do run-time checking.
	  If you say N here, those macros will mostly turn to no-ops.  See
	  arch/mips/include/asm/debug.h for debugging macros.
	  If unsure, say N.

config DEBUG_ZBOOT
	bool "Enable compressed kernel support debugging"
	depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
	default n
	help
	  If you want to add compressed kernel support to a new board, and the
	  board supports uart16550 compatible serial port, please select
	  SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
	  debug it.

	  If your board doesn't support uart16550 compatible serial port, you
	  can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
	  debug it. for example, add a new serial port support just as
	  arch/mips/boot/compressed/uart-16550.c does.

	  After the compressed kernel support works, please disable this option
	  to reduce the kernel image size and speed up the booting procedure a
	  little.

config SPINLOCK_TEST
	bool "Enable spinlock timing tests in debugfs"
	depends on DEBUG_FS
	default n
	help
	  Add several files to the debugfs to test spinlock speed.

endmenu
Commit	Line	Data
1da177e4 LT	1	menu "Kernel hacking"
1da177e4 LT	2
192ef366 RB	3	config TRACE_IRQFLAGS_SUPPORT
	4	bool
	5	default y
	6
1da177e4 LT	7	source "lib/Kconfig.debug"
1da177e4 LT	8
4dd92e15 RB	9	config EARLY_PRINTK
	10	bool "Early printk" if EMBEDDED
	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
6acc7d48 DV	23	config 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
1da177e4 LT	43	config CMDLINE
1da177e4 LT	44	string "Default kernel command string"
6acc7d48	45	depends on CMDLINE_BOOL
1da177e4 LT	46	default ""
1da177e4 LT	47	help
3e7f9b82	48	On some platforms, there is currently no way for the boot loader to
6acc7d48 DV	49	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
	59	config CMDLINE_OVERRIDE
	60	bool "Built-in command line overrides firware arguments"
	61	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.
1da177e4	69
334c86c4 F	70	config DEBUG_STACKOVERFLOW
	71	bool "Check for stack overflows"
	72	depends on DEBUG_KERNEL
	73	help
	74	This option will cause messages to be printed if free stack space
	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
1da177e4 LT	79	config DEBUG_STACK_USAGE
	80	bool "Enable stack utilization instrumentation"
	81	depends on DEBUG_KERNEL
	82	help
	83	Enables the display of the minimum amount of free stack which each
	84	task has ever had available in the sysrq-T and sysrq-P debug output.
	85
	86	This option will slow down process creation somewhat.
	87
9349075a	88	config SMTC_IDLE_HOOK_DEBUG
c68644d3 RB	89	bool "Enable additional debug checks before going into CPU idle loop"
	90	depends on DEBUG_KERNEL && MIPS_MT_SMTC
	91	help
	92	This option enables Enable additional debug checks before going into
	93	CPU idle loop. For details on these checks, see
	94	arch/mips/kernel/smtc.c. This debugging option result in significant
	95	overhead so should be disabled in production kernels.
	96
1da177e4 LT	97	config SB1XXX_CORELIS
	98	bool "Corelis Debugger"
	99	depends on SIBYTE_SB1xxx_SOC
	100	select DEBUG_INFO
	101	help
	102	Select compile flags that produce code that can be processed by the
	103	Corelis mksym utility and UDB Emulator.
	104
	105	config RUNTIME_DEBUG
	106	bool "Enable run-time debugging"
	107	depends on DEBUG_KERNEL
	108	help
	109	If you say Y here, some debugging macros will do run-time checking.
	110	If you say N here, those macros will mostly turn to no-ops. See
00ace207	111	arch/mips/include/asm/debug.h for debugging macros.
1da177e4 LT	112	If unsure, say N.
1da177e4 LT	113
f86a69b1 WZ	114	config DEBUG_ZBOOT
	115	bool "Enable compressed kernel support debugging"
	116	depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
	117	default n
	118	help
	119	If you want to add compressed kernel support to a new board, and the
	120	board supports uart16550 compatible serial port, please select
	121	SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
	122	debug it.
	123
	124	If your board doesn't support uart16550 compatible serial port, you
	125	can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
	126	debug it. for example, add a new serial port support just as
	127	arch/mips/boot/compressed/uart-16550.c does.
	128
	129	After the compressed kernel support works, please disable this option
	130	to reduce the kernel image size and speed up the booting procedure a
	131	little.
	132
bba90760 DD	133	config SPINLOCK_TEST
	134	bool "Enable spinlock timing tests in debugfs"
	135	depends on DEBUG_FS
	136	default n
	137	help
	138	Add several files to the debugfs to test spinlock speed.
	139
1da177e4	140	endmenu