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Linus Torvalds1da177e2005-04-16 15:20:36 -07001menu "Kernel hacking"
2
Paul Mundtafbfb522006-12-04 18:17:28 +09003config TRACE_IRQFLAGS_SUPPORT
Harvey Harrisond7ef4fb2007-12-11 13:49:35 +09004 def_bool y
Paul Mundtafbfb522006-12-04 18:17:28 +09005
Linus Torvalds1da177e2005-04-16 15:20:36 -07006source "lib/Kconfig.debug"
7
8config SH_STANDARD_BIOS
9 bool "Use LinuxSH standard BIOS"
Paul Mundt1a013e22008-04-25 11:54:06 +090010 depends on SUPERH32
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 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"
Paul Mundt6fc21b82006-11-27 12:10:23 +090024 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
Paul Mundt8d797cd2007-08-07 18:52:29 +090031 hex
Paul Mundt6fc21b82006-11-27 12:10:23 +090032 depends on EARLY_SCIF_CONSOLE
Paul Mundt2ad69902008-03-13 12:52:44 +090033 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 || \
Yoshihiro Shimodaa4e1d082008-07-07 21:11:51 +090039 CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
40 CPU_SUBTYPE_SH7343
Paul Mundt2ad69902008-03-13 12:52:44 +090041 default "0xffe80000" if CPU_SH4
Magnus Damm5cbc3af2007-09-10 12:05:10 +090042 default "0xffea0000" if CPU_SUBTYPE_SH7785
Paul Mundt6d01f512007-11-26 18:17:21 +090043 default "0xfffe8000" if CPU_SUBTYPE_SH7203
Paul Mundta8f67f42007-11-26 19:54:02 +090044 default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
Paul Mundt8d797cd2007-08-07 18:52:29 +090045 default "0x00000000"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
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
Paul Mundt6fc21b82006-11-27 12:10:23 +090058 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
Paul Mundt91e656a2007-06-01 14:19:22 +090063config DEBUG_BOOTMEM
64 depends on DEBUG_KERNEL
65 bool "Debug BOOTMEM initialization"
66
Paul Mundtd153ea82006-09-27 18:20:16 +090067config DEBUG_STACKOVERFLOW
68 bool "Check for stack overflows"
Paul Mundt5db141a2007-11-21 17:47:15 +090069 depends on DEBUG_KERNEL && SUPERH32
Paul Mundtd153ea82006-09-27 18:20:16 +090070 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
Paul Mundta6a311392006-09-27 18:22:14 +090083config 4KSTACKS
84 bool "Use 4Kb for kernel stacks instead of 8Kb"
Paul Mundtb817f7e2008-09-20 20:16:35 +090085 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
Paul Mundta6a311392006-09-27 18:22:14 +090086 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
Paul Mundt110ed282007-11-02 12:16:51 +090093config IRQSTACKS
94 bool "Use separate kernel stacks when processing interrupts"
Paul Mundt5db141a2007-11-21 17:47:15 +090095 depends on DEBUG_KERNEL && SUPERH32
Paul Mundt110ed282007-11-02 12:16:51 +090096 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
Paul Mundt5d2685d2008-12-17 15:56:06 +0900101config 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
Paul Mundt740a3e62008-12-17 15:33:43 +0900113config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125config 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
Paul Mundt8214d522007-11-21 16:58:56 +0900136config SH64_SR_WATCH
137 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
Paul Mundtfe58cac2008-12-17 15:36:50 +0900138 depends on SUPERH64
Paul Mundt8214d522007-11-21 16:58:56 +0900139
140config POOR_MANS_STRACE
141 bool "Debug: enable rudimentary strace facility"
Paul Mundtfe58cac2008-12-17 15:36:50 +0900142 depends on SUPERH64
Paul Mundt8214d522007-11-21 16:58:56 +0900143 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148endmenu