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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
Paul Mackerrasff642082005-10-10 22:15:52 +10005config DEBUG_STACKOVERFLOW
6 bool "Check for stack overflows"
Kumar Gala304df8f2007-01-30 00:45:56 -06007 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +10008 help
9 This option will cause messages to be printed if free stack space
10 drops below a certain limit.
11
Paul Mackerrasff642082005-10-10 22:15:52 +100012config DEBUG_STACK_USAGE
13 bool "Stack utilization instrumentation"
Kumar Gala304df8f2007-01-30 00:45:56 -060014 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100015 help
16 Enables the display of the minimum amount of free stack which each
17 task has ever had available in the sysrq-T and sysrq-P debug output.
18
19 This option will slow down process creation somewhat.
20
Benjamin Herrenschmidt88df6e92007-04-12 15:30:22 +100021config DEBUG_PAGEALLOC
22 bool "Debug page memory allocations"
Rafael J. Wysockib0cb1a12007-07-29 23:24:36 +020023 depends on DEBUG_KERNEL && !HIBERNATION
Benjamin Herrenschmidt88df6e92007-04-12 15:30:22 +100024 help
25 Unmap pages from the kernel linear mapping after free_pages().
26 This results in a large slowdown, but helps to find certain types
27 of memory corruptions.
28
29
Mike Kravetz57852a82006-09-06 16:23:12 -070030config HCALL_STATS
31 bool "Hypervisor call instrumentation"
32 depends on PPC_PSERIES && DEBUG_FS
33 help
34 Adds code to keep track of the number of hypervisor calls made and
David Sterba3dde6ad2007-05-09 07:12:20 +020035 the amount of time spent in hypervisor calls. Wall time spent in
Mike Kravetz57852a82006-09-06 16:23:12 -070036 each call is always calculated, and if available CPU cycles spent
37 are also calculated. A directory named hcall_inst is added at the
38 root of the debugfs filesystem. Within the hcall_inst directory
39 are files that contain CPU specific call statistics.
40
41 This option will add a small amount of overhead to all hypervisor
42 calls.
43
Paul Mackerrasff642082005-10-10 22:15:52 +100044config DEBUGGER
45 bool "Enable debugger hooks"
46 depends on DEBUG_KERNEL
47 help
48 Include in-kernel hooks for kernel debuggers. Unless you are
49 intending to debug the kernel, say N here.
50
Paul Mackerras14cf11a2005-09-26 16:04:21 +100051config KGDB
52 bool "Include kgdb kernel debugger"
Paul Mackerrasff642082005-10-10 22:15:52 +100053 depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx)
Paul Mackerras14cf11a2005-09-26 16:04:21 +100054 select DEBUG_INFO
55 help
56 Include in-kernel hooks for kgdb, the Linux kernel source level
57 debugger. See <http://kgdb.sourceforge.net/> for more information.
58 Unless you are intending to debug the kernel, say N here.
59
60choice
61 prompt "Serial Port"
62 depends on KGDB
63 default KGDB_TTYS1
64
65config KGDB_TTYS0
66 bool "ttyS0"
67
68config KGDB_TTYS1
69 bool "ttyS1"
70
71config KGDB_TTYS2
72 bool "ttyS2"
73
74config KGDB_TTYS3
75 bool "ttyS3"
76
77endchoice
78
79config KGDB_CONSOLE
80 bool "Enable serial console thru kgdb port"
81 depends on KGDB && 8xx || CPM2
82 help
83 If you enable this, all serial console messages will be sent
84 over the gdb stub.
85 If unsure, say N.
86
87config XMON
88 bool "Include xmon kernel debugger"
Stephen Rothwellbbb68172006-11-30 11:44:09 +110089 depends on DEBUGGER
Paul Mackerras14cf11a2005-09-26 16:04:21 +100090 help
91 Include in-kernel hooks for the xmon kernel monitor/debugger.
92 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +100093 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
94 nothing will appear on the screen (xmon writes directly to the
95 framebuffer memory).
96 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
97 very early during boot. 'xmon=on' will just enable the xmon
98 debugger hooks. 'xmon=off' will disable the debugger hooks
99 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +0200100 xmon will print a backtrace on the very first invocation.
101 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +1000102
103config XMON_DEFAULT
104 bool "Enable xmon by default"
105 depends on XMON
106 help
107 xmon is normally disabled unless booted with 'xmon=on'.
108 Use 'xmon=off' to disable xmon init during runtime.
109
Michael Ellermane0426042006-11-23 00:46:45 +0100110config XMON_DISASSEMBLY
111 bool "Include disassembly support in xmon"
112 depends on XMON
113 default y
114 help
115 Include support for disassembling in xmon. You probably want
116 to say Y here, unless you're building for a memory-constrained
117 system.
118
Paul Mackerrasff642082005-10-10 22:15:52 +1000119config IRQSTACKS
120 bool "Use separate kernel stacks when processing interrupts"
121 depends on PPC64
122 help
123 If you say Y here the kernel will use separate kernel stacks
124 for handling hard and soft interrupts. This can help avoid
125 overflowing the process kernel stacks.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000126
Michael Ellerman60b332e2007-08-28 18:47:57 +1000127config VIRQ_DEBUG
128 bool "Expose hardware/virtual IRQ mapping via debugfs"
129 depends on DEBUG_FS && PPC_MERGE
130 help
131 This option will show the mapping relationship between hardware irq
132 numbers and virtual irq numbers. The mapping is exposed via debugfs
133 in the file powerpc/virq_mapping.
134
135 If you don't know what this means you don't need it.
136
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000137config BDI_SWITCH
138 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000139 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000140 help
141 Include in-kernel support for the Abatron BDI2000 debugger.
142 Unless you are intending to debug the kernel with one of these
143 machines, say N here.
144
145config BOOTX_TEXT
146 bool "Support for early boot text console (BootX or OpenFirmware only)"
Adrian Bunk247537b2007-09-26 20:02:52 +0200147 depends on PPC_OF && PPC_MULTIPLATFORM
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000148 help
149 Say Y here to see progress messages from the boot firmware in text
150 mode. Requires either BootX or Open Firmware.
151
Michael Ellerman485a2d52006-05-09 16:03:51 +1000152config PPC_EARLY_DEBUG
153 bool "Early debugging (dangerous)"
Benjamin Herrenschmidt7ee17462007-12-11 14:48:24 +1100154 help
155 Say Y to enable some early debugging facilities that may be available
156 for your processor/board combination. Those facilities are hacks
157 intended to debug problems early during boot, this should not be
158 enabled in a production kernel.
159 Note that enabling this will also cause the kernel default log level
160 to be pushed to max automatically very early during boot
Michael Ellerman485a2d52006-05-09 16:03:51 +1000161
Michael Ellerman296167a2006-01-11 11:54:09 +1100162choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000163 prompt "Early debugging console"
164 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100165 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000166 Use the selected console for early debugging. Careful, if you
167 enable debugging for the wrong type of machine your kernel
168 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100169
170config PPC_EARLY_DEBUG_LPAR
171 bool "LPAR HV Console"
172 depends on PPC_PSERIES
173 help
174 Select this to enable early debugging for a machine with a HVC
175 console on vterm 0.
176
177config PPC_EARLY_DEBUG_G5
178 bool "Apple G5"
179 depends on PPC_PMAC64
180 help
181 Select this to enable early debugging for Apple G5 machines.
182
Michael Ellermancc46bb92006-06-23 18:20:16 +1000183config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100184 bool "RTAS Panel"
185 depends on PPC_RTAS
186 help
187 Select this to enable early debugging via the RTAS panel.
188
Michael Ellermancc46bb92006-06-23 18:20:16 +1000189config PPC_EARLY_DEBUG_RTAS_CONSOLE
190 bool "RTAS Console"
191 depends on PPC_RTAS
192 select UDBG_RTAS_CONSOLE
193 help
194 Select this to enable early debugging via the RTAS console.
195
Michael Ellerman296167a2006-01-11 11:54:09 +1100196config PPC_EARLY_DEBUG_MAPLE
197 bool "Maple real mode"
198 depends on PPC_MAPLE
199 help
200 Select this to enable early debugging for Maple.
201
202config PPC_EARLY_DEBUG_ISERIES
203 bool "iSeries HV Console"
204 depends on PPC_ISERIES
205 help
206 Select this to enable early debugging for legacy iSeries. You need
207 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
208
Olof Johansson39c870d2007-02-04 16:36:49 -0600209config PPC_EARLY_DEBUG_PAS_REALMODE
210 bool "PA Semi real mode"
211 depends on PPC_PASEMI
212 help
213 Select this to enable early debugging for PA Semi.
214 Output will be on UART0.
215
Ishizaki Kouc347b792007-02-02 16:47:17 +0900216config PPC_EARLY_DEBUG_BEAT
217 bool "Beat HV Console"
218 depends on PPC_CELLEB
219 select PPC_UDBG_BEAT
220 help
221 Select this to enable early debugging for Celleb with Beat.
222
David Gibsond9b55a02007-05-08 12:59:31 +1000223config PPC_EARLY_DEBUG_44x
224 bool "Early serial debugging for IBM/AMCC 44x CPUs"
225 depends on 44x
David Gibsond9b55a02007-05-08 12:59:31 +1000226 help
227 Select this to enable early debugging for IBM 44x chips via the
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100228 inbuilt serial port. If you enable this, ensure you set
229 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
David Gibsond9b55a02007-05-08 12:59:31 +1000230
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100231config PPC_EARLY_DEBUG_40x
232 bool "Early serial debugging for IBM/AMCC 40x CPUs"
233 depends on 40x
234 help
235 Select this to enable early debugging for IBM 40x chips via the
236 inbuilt serial port. This works on chips with a 16550 compatible
237 UART. Xilinx chips with uartlite cannot use this option.
238
Scott Woodc374e002007-07-16 11:43:43 -0500239config PPC_EARLY_DEBUG_CPM
240 bool "Early serial debugging for Freescale CPM-based serial ports"
241 depends on SERIAL_CPM
242 select PIN_TLB if PPC_8xx
243 help
244 Select this to enable early debugging for Freescale chips
245 using a CPM-based serial port. This assumes that the bootwrapper
246 has run, and set up the CPM in a particular way.
247
Michael Ellerman296167a2006-01-11 11:54:09 +1100248endchoice
249
David Gibsond9b55a02007-05-08 12:59:31 +1000250config PPC_EARLY_DEBUG_44x_PHYSLOW
251 hex "Low 32 bits of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200252 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000253 default "0x40000200"
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100254 help
255 You probably want 0x40000200 for ebony boards and
256 0x40000300 for taishan
David Gibsond9b55a02007-05-08 12:59:31 +1000257
258config PPC_EARLY_DEBUG_44x_PHYSHIGH
259 hex "EPRN of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200260 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000261 default "0x1"
262
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100263config PPC_EARLY_DEBUG_40x_PHYSADDR
264 hex "Early debug UART physical address"
265 depends on PPC_EARLY_DEBUG_40x
266 default "0xef600300"
267
Scott Woodc374e002007-07-16 11:43:43 -0500268config PPC_EARLY_DEBUG_CPM_ADDR
269 hex "CPM UART early debug transmit descriptor address"
270 depends on PPC_EARLY_DEBUG_CPM
Scott Wood15f8c602007-09-28 14:06:16 -0500271 default "0xfa202008" if PPC_EP88XC
272 default "0xf0000008" if CPM2
273 default "0xff002008" if CPM1
Scott Woodc374e002007-07-16 11:43:43 -0500274 help
275 This specifies the address of the transmit descriptor
276 used for early debug output. Because it is needed before
277 platform probing is done, all platforms selected must
278 share the same address.
279
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000280endmenu