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

menu "Kernel hacking"

source "lib/Kconfig.debug"

# RMK wants arm kernels compiled with frame pointers so hardwire this to y.
# If you know what you are doing and are willing to live without stack
# traces, you can get a slightly smaller kernel by setting this option to
# n, but then RMK will have to kill you ;).
config FRAME_POINTER
	bool
	default y
	help
	  If you say N here, the resulting kernel will be slightly smaller and
	  faster. However, when a problem occurs with the kernel, the
	  information that is reported is severely limited. Most people
	  should say Y here.

config DEBUG_USER
	bool "Verbose user fault messages"
	help
	  When a user program crashes due to an exception, the kernel can
	  print a brief message explaining what the problem was. This is
	  sometimes helpful for debugging but serves no purpose on a
	  production system. Most people should say N here.

	  In addition, you need to pass user_debug=N on the kernel command
	  line to enable this feature.  N consists of the sum of:

	      1 - undefined instruction events
	      2 - system calls
	      4 - invalid data aborts
	      8 - SIGSEGV faults
	     16 - SIGBUS faults

config DEBUG_ERRORS
	bool "Verbose kernel error messages"
	depends on DEBUG_KERNEL
	help
	  This option controls verbose debugging information which can be
	  printed when the kernel detects an internal error. This debugging
	  information is useful to kernel hackers when tracking down problems,
	  but mostly meaningless to other people. It's safe to say Y unless
	  you are concerned with the code size or don't want to see these
	  messages.

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 output.

# These options are only for real kernel hackers who want to get their hands dirty.
config DEBUG_LL
	bool "Kernel low-level debugging functions"
	depends on DEBUG_KERNEL
	help
	  Say Y here to include definitions of printascii, printch, printhex
	  in the kernel.  This is helpful if you are debugging code that
	  executes before the console is initialized.

config DEBUG_ICEDCC
	bool "Kernel low-level debugging via EmbeddedICE DCC channel"
	depends on DEBUG_LL
	help
	  Say Y here if you want the debug print routines to direct their
	  output to the EmbeddedICE macrocell's DCC channel using
	  co-processor 14. This is known to work on the ARM9 style ICE
	  channel.

	  It does include a timeout to ensure that the system does not
	  totally freeze when there is nothing connected to read.

config DEBUG_DC21285_PORT
	bool "Kernel low-level debugging messages via footbridge serial port"
	depends on DEBUG_LL && FOOTBRIDGE
	help
	  Say Y here if you want the debug print routines to direct their
	  output to the serial port in the DC21285 (Footbridge). Saying N
	  will cause the debug messages to appear on the first 16550
	  serial port.

config DEBUG_CLPS711X_UART2
	bool "Kernel low-level debugging messages via UART2"
	depends on DEBUG_LL && ARCH_CLPS711X
	help
	  Say Y here if you want the debug print routines to direct their
	  output to the second serial port on these devices.  Saying N will
	  cause the debug messages to appear on the first serial port.

config DEBUG_S3C_PORT
	depends on DEBUG_LL && PLAT_S3C
	bool "Kernel low-level debugging messages via S3C UART"
	help
	  Say Y here if you want debug print routines to go to one of the
	  S3C internal UARTs. The chosen UART must have been configured
	  before it is used.

config DEBUG_S3C_UART
	depends on PLAT_S3C
	int "S3C UART to use for low-level debug"
	default "0"
	help
	  Choice for UART for kernel low-level using S3C UARTS,
	  should be between zero and two. The port must have been
	  initialised by the boot-loader before use.

	  The uncompressor code port configuration is now handled
	  by CONFIG_S3C_LOWLEVEL_UART_PORT.

endmenu
Commit	Line	Data
1da177e4 LT	1	menu "Kernel hacking"
	2
	3	source "lib/Kconfig.debug"
	4
	5	# RMK wants arm kernels compiled with frame pointers so hardwire this to y.
	6	# If you know what you are doing and are willing to live without stack
	7	# traces, you can get a slightly smaller kernel by setting this option to
	8	# n, but then RMK will have to kill you ;).
	9	config FRAME_POINTER
	10	bool
	11	default y
	12	help
	13	If you say N here, the resulting kernel will be slightly smaller and
	14	faster. However, when a problem occurs with the kernel, the
	15	information that is reported is severely limited. Most people
	16	should say Y here.
	17
	18	config DEBUG_USER
	19	bool "Verbose user fault messages"
	20	help
	21	When a user program crashes due to an exception, the kernel can
	22	print a brief message explaining what the problem was. This is
	23	sometimes helpful for debugging but serves no purpose on a
	24	production system. Most people should say N here.
	25
	26	In addition, you need to pass user_debug=N on the kernel command
	27	line to enable this feature. N consists of the sum of:
	28
	29	1 - undefined instruction events
	30	2 - system calls
	31	4 - invalid data aborts
	32	8 - SIGSEGV faults
	33	16 - SIGBUS faults
	34
1da177e4 LT	35	config DEBUG_ERRORS
	36	bool "Verbose kernel error messages"
	37	depends on DEBUG_KERNEL
	38	help
	39	This option controls verbose debugging information which can be
	40	printed when the kernel detects an internal error. This debugging
	41	information is useful to kernel hackers when tracking down problems,
	42	but mostly meaningless to other people. It's safe to say Y unless
	43	you are concerned with the code size or don't want to see these
	44	messages.
	45
ddf4e42c SH	46	config DEBUG_STACK_USAGE
	47	bool "Enable stack utilization instrumentation"
	48	depends on DEBUG_KERNEL
	49	help
	50	Enables the display of the minimum amount of free stack which each
	51	task has ever had available in the sysrq-T output.
1da177e4 LT	52
	53	# These options are only for real kernel hackers who want to get their hands dirty.
	54	config DEBUG_LL
	55	bool "Kernel low-level debugging functions"
	56	depends on DEBUG_KERNEL
	57	help
35efb606	58	Say Y here to include definitions of printascii, printch, printhex
1da177e4 LT	59	in the kernel. This is helpful if you are debugging code that
	60	executes before the console is initialized.
	61
	62	config DEBUG_ICEDCC
	63	bool "Kernel low-level debugging via EmbeddedICE DCC channel"
	64	depends on DEBUG_LL
	65	help
	66	Say Y here if you want the debug print routines to direct their
	67	output to the EmbeddedICE macrocell's DCC channel using
	68	co-processor 14. This is known to work on the ARM9 style ICE
	69	channel.
	70
	71	It does include a timeout to ensure that the system does not
	72	totally freeze when there is nothing connected to read.
	73
	74	config DEBUG_DC21285_PORT
	75	bool "Kernel low-level debugging messages via footbridge serial port"
	76	depends on DEBUG_LL && FOOTBRIDGE
	77	help
	78	Say Y here if you want the debug print routines to direct their
	79	output to the serial port in the DC21285 (Footbridge). Saying N
	80	will cause the debug messages to appear on the first 16550
	81	serial port.
	82
	83	config DEBUG_CLPS711X_UART2
	84	bool "Kernel low-level debugging messages via UART2"
	85	depends on DEBUG_LL && ARCH_CLPS711X
	86	help
	87	Say Y here if you want the debug print routines to direct their
	88	output to the second serial port on these devices. Saying N will
	89	cause the debug messages to appear on the first serial port.
	90
3ec20520 BD	91	config DEBUG_S3C_PORT
	92	depends on DEBUG_LL && PLAT_S3C
	93	bool "Kernel low-level debugging messages via S3C UART"
1da177e4 LT	94	help
1da177e4 LT	95	Say Y here if you want debug print routines to go to one of the
3ec20520	96	S3C internal UARTs. The chosen UART must have been configured
1da177e4 LT	97	before it is used.
1da177e4 LT	98
3ec20520 BD	99	config DEBUG_S3C_UART
	100	depends on PLAT_S3C
	101	int "S3C UART to use for low-level debug"
1da177e4 LT	102	default "0"
1da177e4 LT	103	help
3ec20520	104	Choice for UART for kernel low-level using S3C UARTS,
1da177e4	105	should be between zero and two. The port must have been
c41045a4	106	initialised by the boot-loader before use.
1da177e4 LT	107
1da177e4 LT	108	The uncompressor code port configuration is now handled
c7657846	109	by CONFIG_S3C_LOWLEVEL_UART_PORT.
1da177e4 LT	110
1da177e4 LT	111	endmenu