[mirror_ubuntu-artful-kernel.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 EXPERT
	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 EARLY_PRINTK_8250
	bool
	depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
	default y
	help
	  "8250/16550 and compatible serial early printk driver"
	  If you say Y here, it will be possible to use a 8250/16550 serial
	  port as the boot console.

config USE_GENERIC_EARLY_PRINTK_8250
	bool

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 firmware 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 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 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.

if CPU_MIPSR6

choice
	prompt "Compact branch policy"
	default MIPS_COMPACT_BRANCHES_OPTIMAL

config MIPS_COMPACT_BRANCHES_NEVER
	bool "Never (force delay slot branches)"
	help
	  Pass the -mcompact-branches=never flag to the compiler in order to
	  force it to always emit branches with delay slots, and make no use
	  of the compact branch instructions introduced by MIPSr6. This is
	  useful if you suspect there may be an issue with compact branches in
	  either the compiler or the CPU.

config MIPS_COMPACT_BRANCHES_OPTIMAL
	bool "Optimal (use where beneficial)"
	help
	  Pass the -mcompact-branches=optimal flag to the compiler in order for
	  it to make use of compact branch instructions where it deems them
	  beneficial, and use branches with delay slots elsewhere. This is the
	  default compiler behaviour, and should be used unless you have a
	  reason to choose otherwise.

config MIPS_COMPACT_BRANCHES_ALWAYS
	bool "Always (force compact branches)"
	help
	  Pass the -mcompact-branches=always flag to the compiler in order to
	  force it to always emit compact branches, making no use of branch
	  instructions with delay slots. This can result in more compact code
	  which may be beneficial in some scenarios.

endchoice

endif # CPU_MIPSR6

config SCACHE_DEBUGFS
	bool "L2 cache debugfs entries"
	depends on DEBUG_FS
	help
	  Enable this to allow parts of the L2 cache configuration, such as
	  whether or not prefetching is enabled, to be exposed to userland
	  via debugfs.

	  If unsure, say N.

menuconfig MIPS_CPS_NS16550
	bool "CPS SMP NS16550 UART output"
	depends on MIPS_CPS
	help
	  Output debug information via an ns16550 compatible UART if exceptions
	  occur early in the boot process of a secondary core.

if MIPS_CPS_NS16550

config MIPS_CPS_NS16550_BASE
	hex "UART Base Address"
	default 0x1b0003f8 if MIPS_MALTA
	help
	  The base address of the ns16550 compatible UART on which to output
	  debug information from the early stages of core startup.

config MIPS_CPS_NS16550_SHIFT
	int "UART Register Shift"
	default 0 if MIPS_MALTA
	help
	  The number of bits to shift ns16550 register indices by in order to
	  form their addresses. That is, log base 2 of the span between
	  adjacent ns16550 registers in the system.

endif # MIPS_CPS_NS16550

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	9	config EARLY_PRINTK
6a108a14	10	bool "Early printk" if EXPERT
4dd92e15 RB	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
7cd93b89	23	config EARLY_PRINTK_8250
e6086557 RB	24	bool
	25	depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
	26	default y
7cd93b89	27	help
e6086557	28	"8250/16550 and compatible serial early printk driver"
7cd93b89 YY	29	If you say Y here, it will be possible to use a 8250/16550 serial
	30	port as the boot console.
	31
e6086557 RB	32	config USE_GENERIC_EARLY_PRINTK_8250
	33	bool
	34
6acc7d48 DV	35	config CMDLINE_BOOL
	36	bool "Built-in kernel command line"
	37	default n
	38	help
	39	For most systems, it is firmware or second stage bootloader that
	40	by default specifies the kernel command line options. However,
	41	it might be necessary or advantageous to either override the
	42	default kernel command line or add a few extra options to it.
	43	For such cases, this option allows you to hardcode your own
	44	command line options directly into the kernel. For that, you
	45	should choose 'Y' here, and fill in the extra boot arguments
	46	in CONFIG_CMDLINE.
	47
	48	The built-in options will be concatenated to the default command
	49	line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
	50	command line will be ignored and replaced by the built-in string.
	51
	52	Most MIPS systems will normally expect 'N' here and rely upon
	53	the command line from the firmware or the second-stage bootloader.
	54
1da177e4 LT	55	config CMDLINE
1da177e4 LT	56	string "Default kernel command string"
6acc7d48	57	depends on CMDLINE_BOOL
1da177e4 LT	58	default ""
1da177e4 LT	59	help
3e7f9b82	60	On some platforms, there is currently no way for the boot loader to
6acc7d48 DV	61	pass arguments to the kernel. For these platforms, and for the cases
	62	when you want to add some extra options to the command line or ignore
	63	the default command line, you can supply some command-line options at
	64	build time by entering them here. In other cases you can specify
	65	kernel args so that you don't have to set them up in board prom
	66	initialization routines.
	67
	68	For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
	69	options.
	70
	71	config CMDLINE_OVERRIDE
6b2aac42	72	bool "Built-in command line overrides firmware arguments"
6acc7d48 DV	73	default n
	74	depends on CMDLINE_BOOL
	75	help
	76	By setting this option to 'Y' you will have your kernel ignore
	77	command line arguments from firmware or second stage bootloader.
	78	Instead, the built-in command line will be used exclusively.
	79
	80	Normally, you will choose 'N' here.
1da177e4	81
1da177e4 LT	82	config SB1XXX_CORELIS
	83	bool "Corelis Debugger"
	84	depends on SIBYTE_SB1xxx_SOC
	85	select DEBUG_INFO
	86	help
	87	Select compile flags that produce code that can be processed by the
	88	Corelis mksym utility and UDB Emulator.
	89
f86a69b1 WZ	90	config DEBUG_ZBOOT
	91	bool "Enable compressed kernel support debugging"
	92	depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
	93	default n
	94	help
	95	If you want to add compressed kernel support to a new board, and the
	96	board supports uart16550 compatible serial port, please select
	97	SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
	98	debug it.
	99
	100	If your board doesn't support uart16550 compatible serial port, you
	101	can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
	102	debug it. for example, add a new serial port support just as
	103	arch/mips/boot/compressed/uart-16550.c does.
	104
	105	After the compressed kernel support works, please disable this option
	106	to reduce the kernel image size and speed up the booting procedure a
	107	little.
	108
bba90760 DD	109	config SPINLOCK_TEST
	110	bool "Enable spinlock timing tests in debugfs"
	111	depends on DEBUG_FS
	112	default n
	113	help
	114	Add several files to the debugfs to test spinlock speed.
	115
c1a0e9bc PB	116	if CPU_MIPSR6
	117
	118	choice
	119	prompt "Compact branch policy"
	120	default MIPS_COMPACT_BRANCHES_OPTIMAL
	121
	122	config MIPS_COMPACT_BRANCHES_NEVER
	123	bool "Never (force delay slot branches)"
	124	help
	125	Pass the -mcompact-branches=never flag to the compiler in order to
	126	force it to always emit branches with delay slots, and make no use
	127	of the compact branch instructions introduced by MIPSr6. This is
	128	useful if you suspect there may be an issue with compact branches in
	129	either the compiler or the CPU.
	130
	131	config MIPS_COMPACT_BRANCHES_OPTIMAL
	132	bool "Optimal (use where beneficial)"
	133	help
	134	Pass the -mcompact-branches=optimal flag to the compiler in order for
	135	it to make use of compact branch instructions where it deems them
	136	beneficial, and use branches with delay slots elsewhere. This is the
	137	default compiler behaviour, and should be used unless you have a
	138	reason to choose otherwise.
	139
	140	config MIPS_COMPACT_BRANCHES_ALWAYS
	141	bool "Always (force compact branches)"
	142	help
	143	Pass the -mcompact-branches=always flag to the compiler in order to
	144	force it to always emit compact branches, making no use of branch
	145	instructions with delay slots. This can result in more compact code
	146	which may be beneficial in some scenarios.
	147
	148	endchoice
	149
	150	endif # CPU_MIPSR6
	151
d478b088 PB	152	config SCACHE_DEBUGFS
	153	bool "L2 cache debugfs entries"
	154	depends on DEBUG_FS
	155	help
	156	Enable this to allow parts of the L2 cache configuration, such as
	157	whether or not prefetching is enabled, to be exposed to userland
	158	via debugfs.
	159
	160	If unsure, say N.
	161
609cf6f2 PB	162	menuconfig MIPS_CPS_NS16550
	163	bool "CPS SMP NS16550 UART output"
	164	depends on MIPS_CPS
	165	help
	166	Output debug information via an ns16550 compatible UART if exceptions
	167	occur early in the boot process of a secondary core.
	168
	169	if MIPS_CPS_NS16550
	170
	171	config MIPS_CPS_NS16550_BASE
	172	hex "UART Base Address"
	173	default 0x1b0003f8 if MIPS_MALTA
	174	help
	175	The base address of the ns16550 compatible UART on which to output
	176	debug information from the early stages of core startup.
	177
	178	config MIPS_CPS_NS16550_SHIFT
	179	int "UART Register Shift"
	180	default 0 if MIPS_MALTA
	181	help
	182	The number of bits to shift ns16550 register indices by in order to
	183	form their addresses. That is, log base 2 of the span between
	184	adjacent ns16550 registers in the system.
	185
	186	endif # MIPS_CPS_NS16550
	187
1da177e4	188	endmenu