xref: /openbmc/linux/arch/sh/Kconfig.debug (revision 5dafc91f) 
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 "0xfffe8000" if CPU_SUBTYPE_SH7203
43	default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
44	default "0xffe80000" if CPU_SH4
45	default "0x00000000"
46
47config EARLY_PRINTK
48	bool "Early printk support"
49	depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
50	help
51	  Say Y here to redirect kernel printk messages to the serial port
52	  used by the SH-IPL bootloader, starting very early in the boot
53	  process and ending when the kernel's serial console is initialised.
54	  This option is only useful porting the kernel to a new machine,
55	  when the kernel may crash or hang before the serial console is
56	  initialised. If unsure, say N.
57
58	  On devices that are running SH-IPL and want to keep the port
59	  initialization consistent while not using the BIOS callbacks,
60	  select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
61	  the kernel command line option to toggle back and forth.
62
63config DEBUG_BOOTMEM
64	depends on DEBUG_KERNEL
65	bool "Debug BOOTMEM initialization"
66
67config DEBUG_STACKOVERFLOW
68	bool "Check for stack overflows"
69	depends on DEBUG_KERNEL && SUPERH32
70	help
71	  This option will cause messages to be printed if free stack space
72	  drops below a certain limit.
73
74config DEBUG_STACK_USAGE
75	bool "Stack utilization instrumentation"
76	depends on DEBUG_KERNEL
77	help
78	  Enables the display of the minimum amount of free stack which each
79	  task has ever had available in the sysrq-T and sysrq-P debug output.
80
81	  This option will slow down process creation somewhat.
82
83config 4KSTACKS
84	bool "Use 4Kb for kernel stacks instead of 8Kb"
85	depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
86	help
87	  If you say Y here the kernel will use a 4Kb stacksize for the
88	  kernel stack attached to each process/thread. This facilitates
89	  running more threads on a system and also reduces the pressure
90	  on the VM subsystem for higher order allocations. This option
91	  will also use IRQ stacks to compensate for the reduced stackspace.
92
93config IRQSTACKS
94	bool "Use separate kernel stacks when processing interrupts"
95	depends on DEBUG_KERNEL && SUPERH32 && BROKEN
96	help
97	  If you say Y here the kernel will use separate kernel stacks
98	  for handling hard and soft interrupts.  This can help avoid
99	  overflowing the process kernel stacks.
100
101config DUMP_CODE
102	bool "Show disassembly of nearby code in register dumps"
103	depends on DEBUG_KERNEL && SUPERH32
104	default y if DEBUG_BUGVERBOSE
105	default n
106	help
107	  This prints out a code trace of the instructions leading up to
108	  the faulting instruction as a debugging aid. As this does grow
109	  the kernel in size a bit, most users will want to say N here.
110
111	  Those looking for more verbose debugging output should say Y.
112
113config SH_NO_BSS_INIT
114	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
115	depends on DEBUG_KERNEL
116	default n
117	help
118	  If running in painfully slow environments, such as an RTL
119	  simulation or from remote memory via SHdebug, where the memory
120	  can already be gauranteed to ber zeroed on boot, say Y.
121
122	  For all other cases, say N. If this option seems perplexing, or
123	  you aren't sure, say N.
124
125config MORE_COMPILE_OPTIONS
126	bool "Add any additional compile options"
127	help
128	  If you want to add additional CFLAGS to the kernel build, enable this
129	  option and then enter what you would like to add in the next question.
130	  Note however that -g is already appended with the selection of KGDB.
131
132config COMPILE_OPTIONS
133	string "Additional compile arguments"
134	depends on MORE_COMPILE_OPTIONS
135
136config SH64_SR_WATCH
137	bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
138	depends on SUPERH64
139
140config POOR_MANS_STRACE
141	bool "Debug: enable rudimentary strace facility"
142	depends on SUPERH64
143	help
144	  This option allows system calls to be traced to the console.  It also
145	  aids in detecting kernel stack underflow.  It is useful for debugging
146	  early-userland problems (e.g. init incurring fatal exceptions.)
147
148endmenu
149