[deliverable/linux.git] / arch / arm / Kconfig.debug

menu "Kernel hacking"

source "lib/Kconfig.debug"

# RMK wants arm kernels compiled with frame pointers or stack unwinding.
# 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
	depends on !THUMB2_KERNEL
	default y if !ARM_UNWIND
	help
	  If you say N here, the resulting kernel will be slightly smaller and
	  faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
	  when a problem occurs with the kernel, the information that is
	  reported is severely limited.

config ARM_UNWIND
	bool "Enable stack unwinding support"
	depends on AEABI && EXPERIMENTAL
	default y
	help
	  This option enables stack unwinding support in the kernel
	  using the information automatically generated by the
	  compiler. The resulting kernel image is slightly bigger but
	  the performance is not affected. Currently, this feature
	  only works with EABI compilers. If unsure say Y.

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 and on the XScale with the PEEDI.

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

config OC_ETM
	bool "On-chip ETM and ETB"
	select ARM_AMBA
	help
	  Enables the on-chip embedded trace macrocell and embedded trace
	  buffer driver that will allow you to collect traces of the
	  kernel code.

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_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
adf8b37b	5	# RMK wants arm kernels compiled with frame pointers or stack unwinding.
1da177e4 LT	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
16c79651	11	depends on !THUMB2_KERNEL
adf8b37b	12	default y if !ARM_UNWIND
1da177e4 LT	13	help
1da177e4 LT	14	If you say N here, the resulting kernel will be slightly smaller and
adf8b37b CM	15	faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
	16	when a problem occurs with the kernel, the information that is
	17	reported is severely limited.
	18
	19	config ARM_UNWIND
	20	bool "Enable stack unwinding support"
	21	depends on AEABI && EXPERIMENTAL
	22	default y
	23	help
	24	This option enables stack unwinding support in the kernel
	25	using the information automatically generated by the
	26	compiler. The resulting kernel image is slightly bigger but
	27	the performance is not affected. Currently, this feature
	28	only works with EABI compilers. If unsure say Y.
1da177e4 LT	29
	30	config DEBUG_USER
	31	bool "Verbose user fault messages"
	32	help
	33	When a user program crashes due to an exception, the kernel can
	34	print a brief message explaining what the problem was. This is
	35	sometimes helpful for debugging but serves no purpose on a
	36	production system. Most people should say N here.
	37
	38	In addition, you need to pass user_debug=N on the kernel command
	39	line to enable this feature. N consists of the sum of:
	40
	41	1 - undefined instruction events
	42	2 - system calls
	43	4 - invalid data aborts
	44	8 - SIGSEGV faults
	45	16 - SIGBUS faults
	46
1da177e4 LT	47	config DEBUG_ERRORS
	48	bool "Verbose kernel error messages"
	49	depends on DEBUG_KERNEL
	50	help
	51	This option controls verbose debugging information which can be
	52	printed when the kernel detects an internal error. This debugging
	53	information is useful to kernel hackers when tracking down problems,
	54	but mostly meaningless to other people. It's safe to say Y unless
	55	you are concerned with the code size or don't want to see these
	56	messages.
	57
ddf4e42c SH	58	config DEBUG_STACK_USAGE
	59	bool "Enable stack utilization instrumentation"
	60	depends on DEBUG_KERNEL
	61	help
	62	Enables the display of the minimum amount of free stack which each
	63	task has ever had available in the sysrq-T output.
1da177e4 LT	64
	65	# These options are only for real kernel hackers who want to get their hands dirty.
	66	config DEBUG_LL
	67	bool "Kernel low-level debugging functions"
	68	depends on DEBUG_KERNEL
	69	help
35efb606	70	Say Y here to include definitions of printascii, printch, printhex
1da177e4 LT	71	in the kernel. This is helpful if you are debugging code that
	72	executes before the console is initialized.
	73
	74	config DEBUG_ICEDCC
	75	bool "Kernel low-level debugging via EmbeddedICE DCC channel"
	76	depends on DEBUG_LL
	77	help
	78	Say Y here if you want the debug print routines to direct their
	79	output to the EmbeddedICE macrocell's DCC channel using
	80	co-processor 14. This is known to work on the ARM9 style ICE
c633c3cf	81	channel and on the XScale with the PEEDI.
1da177e4 LT	82
	83	It does include a timeout to ensure that the system does not
	84	totally freeze when there is nothing connected to read.
	85
c5d6c770 AS	86	config OC_ETM
	87	bool "On-chip ETM and ETB"
	88	select ARM_AMBA
	89	help
	90	Enables the on-chip embedded trace macrocell and embedded trace
	91	buffer driver that will allow you to collect traces of the
	92	kernel code.
	93
1da177e4 LT	94	config DEBUG_DC21285_PORT
	95	bool "Kernel low-level debugging messages via footbridge serial port"
	96	depends on DEBUG_LL && FOOTBRIDGE
	97	help
	98	Say Y here if you want the debug print routines to direct their
	99	output to the serial port in the DC21285 (Footbridge). Saying N
	100	will cause the debug messages to appear on the first 16550
	101	serial port.
	102
	103	config DEBUG_CLPS711X_UART2
	104	bool "Kernel low-level debugging messages via UART2"
	105	depends on DEBUG_LL && ARCH_CLPS711X
	106	help
	107	Say Y here if you want the debug print routines to direct their
	108	output to the second serial port on these devices. Saying N will
	109	cause the debug messages to appear on the first serial port.
	110
3ec20520 BD	111	config DEBUG_S3C_UART
	112	depends on PLAT_S3C
	113	int "S3C UART to use for low-level debug"
1da177e4 LT	114	default "0"
1da177e4 LT	115	help
3ec20520	116	Choice for UART for kernel low-level using S3C UARTS,
1da177e4	117	should be between zero and two. The port must have been
c41045a4	118	initialised by the boot-loader before use.
1da177e4 LT	119
1da177e4 LT	120	The uncompressor code port configuration is now handled
c7657846	121	by CONFIG_S3C_LOWLEVEL_UART_PORT.
1da177e4 LT	122
1da177e4 LT	123	endmenu