xref: /openbmc/linux/arch/sh/Kconfig.debug (revision b99610fb) 
1menu "Kernel hacking"
2
3config TRACE_IRQFLAGS_SUPPORT
4	def_bool y
5
6source "lib/Kconfig.debug"
7
8config SH_STANDARD_BIOS
9	bool "Use LinuxSH standard BIOS"
10	depends on SUPERH32
11	help
12	  Say Y here if your target has the gdb-sh-stub
13	  package from www.m17n.org (or any conforming standard LinuxSH BIOS)
14	  in FLASH or EPROM.  The kernel will use standard BIOS calls during
15	  boot for various housekeeping tasks (including calls to read and
16	  write characters to a system console, get a MAC address from an
17	  on-board Ethernet interface, and shut down the hardware).  Note this
18	  does not work with machines with an existing operating system in
19	  mask ROM and no flash (WindowsCE machines fall in this category).
20	  If unsure, say N.
21
22config EARLY_SCIF_CONSOLE
23	bool "Use early SCIF console"
24	help
25	  This enables an early console using a fixed SCIF port. This can
26	  be used by platforms that are either not running the SH
27	  standard BIOS, or do not wish to use the BIOS callbacks for the
28	  serial I/O.
29
30config EARLY_SCIF_CONSOLE_PORT
31	hex
32	depends on EARLY_SCIF_CONSOLE
33	default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
34	default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
35	default "0xf8420000" if CPU_SUBTYPE_SH7619
36	default "0xff804000" if CPU_SUBTYPE_MXG
37	default "0xffc30000" if CPU_SUBTYPE_SHX3
38	default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
39				CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
40				CPU_SUBTYPE_SH7343
41	default "0xffea0000" if CPU_SUBTYPE_SH7785
42	default "0xffeb0000" if CPU_SUBTYPE_SH7786
43	default "0xfffe8000" if CPU_SUBTYPE_SH7203
44	default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
45	default "0xffe80000" if CPU_SH4
46	default "0x00000000"
47
48config EARLY_PRINTK
49	bool "Early printk support"
50	depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
51	help
52	  Say Y here to redirect kernel printk messages to the serial port
53	  used by the SH-IPL bootloader, starting very early in the boot
54	  process and ending when the kernel's serial console is initialised.
55	  This option is only useful porting the kernel to a new machine,
56	  when the kernel may crash or hang before the serial console is
57	  initialised. If unsure, say N.
58
59	  On devices that are running SH-IPL and want to keep the port
60	  initialization consistent while not using the BIOS callbacks,
61	  select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
62	  the kernel command line option to toggle back and forth.
63
64config DEBUG_STACKOVERFLOW
65	bool "Check for stack overflows"
66	depends on DEBUG_KERNEL && SUPERH32
67	help
68	  This option will cause messages to be printed if free stack space
69	  drops below a certain limit.
70
71config DEBUG_STACK_USAGE
72	bool "Stack utilization instrumentation"
73	depends on DEBUG_KERNEL
74	help
75	  Enables the display of the minimum amount of free stack which each
76	  task has ever had available in the sysrq-T and sysrq-P debug output.
77
78	  This option will slow down process creation somewhat.
79
80config 4KSTACKS
81	bool "Use 4Kb for kernel stacks instead of 8Kb"
82	depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
83	help
84	  If you say Y here the kernel will use a 4Kb stacksize for the
85	  kernel stack attached to each process/thread. This facilitates
86	  running more threads on a system and also reduces the pressure
87	  on the VM subsystem for higher order allocations. This option
88	  will also use IRQ stacks to compensate for the reduced stackspace.
89
90config IRQSTACKS
91	bool "Use separate kernel stacks when processing interrupts"
92	depends on DEBUG_KERNEL && SUPERH32 && BROKEN
93	help
94	  If you say Y here the kernel will use separate kernel stacks
95	  for handling hard and soft interrupts.  This can help avoid
96	  overflowing the process kernel stacks.
97
98config DUMP_CODE
99	bool "Show disassembly of nearby code in register dumps"
100	depends on DEBUG_KERNEL && SUPERH32
101	default y if DEBUG_BUGVERBOSE
102	default n
103	help
104	  This prints out a code trace of the instructions leading up to
105	  the faulting instruction as a debugging aid. As this does grow
106	  the kernel in size a bit, most users will want to say N here.
107
108	  Those looking for more verbose debugging output should say Y.
109
110config SH_NO_BSS_INIT
111	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
112	depends on DEBUG_KERNEL
113	default n
114	help
115	  If running in painfully slow environments, such as an RTL
116	  simulation or from remote memory via SHdebug, where the memory
117	  can already be gauranteed to ber zeroed on boot, say Y.
118
119	  For all other cases, say N. If this option seems perplexing, or
120	  you aren't sure, say N.
121
122config SH64_SR_WATCH
123	bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
124	depends on SUPERH64
125
126config STACK_DEBUG
127	bool "Enable diagnostic checks of the kernel stack"
128	depends on FUNCTION_TRACER
129	select DEBUG_STACKOVERFLOW
130	default n
131	help
132	  This option allows checks to be performed on the kernel stack
133	  at runtime. Saying Y here will add overhead to every function
134	  call and will therefore incur a major performance hit. Most
135	  users should say N.
136
137endmenu
138