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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
Michael Ellermanba55bd72009-06-09 20:48:51 +00005config PPC_DISABLE_WERROR
6 bool "Don't build arch/powerpc code with -Werror"
7 default n
8 help
9 This option tells the compiler NOT to build the code under
10 arch/powerpc with the -Werror flag (which means warnings
11 are treated as errors).
12
13 Only enable this if you are hitting a build failure in the
14 arch/powerpc code caused by a warning, and you don't feel
15 inclined to fix it.
16
17config PPC_WERROR
18 bool
19 depends on !PPC_DISABLE_WERROR
20 default y
21
Johannes Bergc4d04be2008-11-20 03:24:07 +000022config PRINT_STACK_DEPTH
23 int "Stack depth to print" if DEBUG_KERNEL
24 default 64
25 help
26 This option allows you to set the stack depth that the kernel
27 prints in stack traces. This can be useful if your display is
28 too small and stack traces cause important information to
29 scroll off the screen.
30
Paul Mackerrasff642082005-10-10 22:15:52 +100031config DEBUG_STACKOVERFLOW
32 bool "Check for stack overflows"
Kumar Gala304df8f2007-01-30 00:45:56 -060033 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100034 help
35 This option will cause messages to be printed if free stack space
36 drops below a certain limit.
37
Paul Mackerrasff642082005-10-10 22:15:52 +100038config DEBUG_STACK_USAGE
39 bool "Stack utilization instrumentation"
Kumar Gala304df8f2007-01-30 00:45:56 -060040 depends on DEBUG_KERNEL
Paul Mackerrasff642082005-10-10 22:15:52 +100041 help
42 Enables the display of the minimum amount of free stack which each
43 task has ever had available in the sysrq-T and sysrq-P debug output.
44
45 This option will slow down process creation somewhat.
46
Mike Kravetz57852a82006-09-06 16:23:12 -070047config HCALL_STATS
48 bool "Hypervisor call instrumentation"
Anton Blanchardc8cd0932009-10-26 18:50:29 +000049 depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
Mike Kravetz57852a82006-09-06 16:23:12 -070050 help
51 Adds code to keep track of the number of hypervisor calls made and
David Sterba3dde6ad2007-05-09 07:12:20 +020052 the amount of time spent in hypervisor calls. Wall time spent in
Mike Kravetz57852a82006-09-06 16:23:12 -070053 each call is always calculated, and if available CPU cycles spent
54 are also calculated. A directory named hcall_inst is added at the
55 root of the debugfs filesystem. Within the hcall_inst directory
56 are files that contain CPU specific call statistics.
57
58 This option will add a small amount of overhead to all hypervisor
59 calls.
60
Geert Uytterhoeven80947e72009-05-18 02:10:05 +000061config PPC_EMULATED_STATS
62 bool "Emulated instructions tracking"
63 depends on DEBUG_FS
64 help
65 Adds code to keep track of the number of instructions that are
66 emulated by the in-kernel emulator. Counters for the various classes
67 of emulated instructions are available under
68 powerpc/emulated_instructions/ in the root of the debugfs file
69 system. Optionally (controlled by
70 powerpc/emulated_instructions/do_warn in debugfs), rate-limited
71 warnings can be printed to the console when instructions are
72 emulated.
73
Michael Ellermanae0dc732008-06-24 11:32:32 +100074config CODE_PATCHING_SELFTEST
75 bool "Run self-tests of the code-patching code."
76 depends on DEBUG_KERNEL
77 default n
78
Michael Ellerman362e7702008-06-24 11:33:03 +100079config FTR_FIXUP_SELFTEST
80 bool "Run self-tests of the feature-fixup code."
81 depends on DEBUG_KERNEL
82 default n
83
Michael Ellerman7e302862008-08-06 09:10:01 +100084config MSI_BITMAP_SELFTEST
85 bool "Run self-tests of the MSI bitmap code."
86 depends on DEBUG_KERNEL
87 default n
88
Paul Mackerras14cf11a2005-09-26 16:04:21 +100089config XMON
90 bool "Include xmon kernel debugger"
Jason Wessel17ce4522008-07-23 11:30:15 -050091 depends on DEBUG_KERNEL
Paul Mackerras14cf11a2005-09-26 16:04:21 +100092 help
93 Include in-kernel hooks for the xmon kernel monitor/debugger.
94 Unless you are intending to debug the kernel, say N here.
Paul Mackerrasff642082005-10-10 22:15:52 +100095 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
96 nothing will appear on the screen (xmon writes directly to the
97 framebuffer memory).
98 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
99 very early during boot. 'xmon=on' will just enable the xmon
100 debugger hooks. 'xmon=off' will disable the debugger hooks
101 if CONFIG_XMON_DEFAULT is set.
Olaf Hering26c8af52006-09-08 16:29:21 +0200102 xmon will print a backtrace on the very first invocation.
103 'xmon=nobt' will disable this autobacktrace.
Paul Mackerrasff642082005-10-10 22:15:52 +1000104
105config XMON_DEFAULT
106 bool "Enable xmon by default"
107 depends on XMON
108 help
109 xmon is normally disabled unless booted with 'xmon=on'.
110 Use 'xmon=off' to disable xmon init during runtime.
111
Michael Ellermane0426042006-11-23 00:46:45 +0100112config XMON_DISASSEMBLY
113 bool "Include disassembly support in xmon"
114 depends on XMON
115 default y
116 help
117 Include support for disassembling in xmon. You probably want
118 to say Y here, unless you're building for a memory-constrained
119 system.
120
Jason Wessel17ce4522008-07-23 11:30:15 -0500121config DEBUGGER
122 bool
123 depends on KGDB || XMON
124 default y
125
Paul Mackerrasff642082005-10-10 22:15:52 +1000126config IRQSTACKS
127 bool "Use separate kernel stacks when processing interrupts"
Paul Mackerrasff642082005-10-10 22:15:52 +1000128 help
129 If you say Y here the kernel will use separate kernel stacks
130 for handling hard and soft interrupts. This can help avoid
131 overflowing the process kernel stacks.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000132
Michael Ellerman60b332e2007-08-28 18:47:57 +1000133config VIRQ_DEBUG
134 bool "Expose hardware/virtual IRQ mapping via debugfs"
Kumar Gala9c4cb822008-08-02 02:44:11 +1000135 depends on DEBUG_FS
Michael Ellerman60b332e2007-08-28 18:47:57 +1000136 help
137 This option will show the mapping relationship between hardware irq
138 numbers and virtual irq numbers. The mapping is exposed via debugfs
139 in the file powerpc/virq_mapping.
140
141 If you don't know what this means you don't need it.
142
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000143config BDI_SWITCH
144 bool "Include BDI-2000 user context switcher"
Paul Mackerrasff642082005-10-10 22:15:52 +1000145 depends on DEBUG_KERNEL && PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000146 help
147 Include in-kernel support for the Abatron BDI2000 debugger.
148 Unless you are intending to debug the kernel with one of these
149 machines, say N here.
150
151config BOOTX_TEXT
152 bool "Support for early boot text console (BootX or OpenFirmware only)"
Benjamin Herrenschmidt28794d32009-03-10 17:53:27 +0000153 depends on PPC_OF && PPC_BOOK3S
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000154 help
155 Say Y here to see progress messages from the boot firmware in text
156 mode. Requires either BootX or Open Firmware.
157
Michael Ellerman485a2d52006-05-09 16:03:51 +1000158config PPC_EARLY_DEBUG
159 bool "Early debugging (dangerous)"
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500160 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
161 # mark, which doesn't work with current 440 KVM.
162 depends on !KVM
Benjamin Herrenschmidt7ee17462007-12-11 14:48:24 +1100163 help
164 Say Y to enable some early debugging facilities that may be available
165 for your processor/board combination. Those facilities are hacks
166 intended to debug problems early during boot, this should not be
167 enabled in a production kernel.
168 Note that enabling this will also cause the kernel default log level
169 to be pushed to max automatically very early during boot
Michael Ellerman485a2d52006-05-09 16:03:51 +1000170
Michael Ellerman296167a2006-01-11 11:54:09 +1100171choice
Michael Ellerman485a2d52006-05-09 16:03:51 +1000172 prompt "Early debugging console"
173 depends on PPC_EARLY_DEBUG
Michael Ellerman296167a2006-01-11 11:54:09 +1100174 help
Michael Ellerman485a2d52006-05-09 16:03:51 +1000175 Use the selected console for early debugging. Careful, if you
176 enable debugging for the wrong type of machine your kernel
177 _will not boot_.
Michael Ellerman296167a2006-01-11 11:54:09 +1100178
179config PPC_EARLY_DEBUG_LPAR
180 bool "LPAR HV Console"
181 depends on PPC_PSERIES
182 help
183 Select this to enable early debugging for a machine with a HVC
184 console on vterm 0.
185
186config PPC_EARLY_DEBUG_G5
187 bool "Apple G5"
188 depends on PPC_PMAC64
189 help
190 Select this to enable early debugging for Apple G5 machines.
191
Michael Ellermancc46bb92006-06-23 18:20:16 +1000192config PPC_EARLY_DEBUG_RTAS_PANEL
Michael Ellerman296167a2006-01-11 11:54:09 +1100193 bool "RTAS Panel"
194 depends on PPC_RTAS
195 help
196 Select this to enable early debugging via the RTAS panel.
197
Michael Ellermancc46bb92006-06-23 18:20:16 +1000198config PPC_EARLY_DEBUG_RTAS_CONSOLE
199 bool "RTAS Console"
200 depends on PPC_RTAS
201 select UDBG_RTAS_CONSOLE
202 help
203 Select this to enable early debugging via the RTAS console.
204
Michael Ellerman296167a2006-01-11 11:54:09 +1100205config PPC_EARLY_DEBUG_MAPLE
206 bool "Maple real mode"
207 depends on PPC_MAPLE
208 help
209 Select this to enable early debugging for Maple.
210
211config PPC_EARLY_DEBUG_ISERIES
212 bool "iSeries HV Console"
213 depends on PPC_ISERIES
214 help
215 Select this to enable early debugging for legacy iSeries. You need
216 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
217
Olof Johansson39c870d2007-02-04 16:36:49 -0600218config PPC_EARLY_DEBUG_PAS_REALMODE
219 bool "PA Semi real mode"
220 depends on PPC_PASEMI
221 help
222 Select this to enable early debugging for PA Semi.
223 Output will be on UART0.
224
Ishizaki Kouc347b792007-02-02 16:47:17 +0900225config PPC_EARLY_DEBUG_BEAT
226 bool "Beat HV Console"
227 depends on PPC_CELLEB
228 select PPC_UDBG_BEAT
229 help
230 Select this to enable early debugging for Celleb with Beat.
231
David Gibsond9b55a02007-05-08 12:59:31 +1000232config PPC_EARLY_DEBUG_44x
233 bool "Early serial debugging for IBM/AMCC 44x CPUs"
234 depends on 44x
David Gibsond9b55a02007-05-08 12:59:31 +1000235 help
236 Select this to enable early debugging for IBM 44x chips via the
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100237 inbuilt serial port. If you enable this, ensure you set
238 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
David Gibsond9b55a02007-05-08 12:59:31 +1000239
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100240config PPC_EARLY_DEBUG_40x
241 bool "Early serial debugging for IBM/AMCC 40x CPUs"
242 depends on 40x
243 help
244 Select this to enable early debugging for IBM 40x chips via the
245 inbuilt serial port. This works on chips with a 16550 compatible
246 UART. Xilinx chips with uartlite cannot use this option.
247
Scott Woodc374e002007-07-16 11:43:43 -0500248config PPC_EARLY_DEBUG_CPM
249 bool "Early serial debugging for Freescale CPM-based serial ports"
250 depends on SERIAL_CPM
251 select PIN_TLB if PPC_8xx
252 help
253 Select this to enable early debugging for Freescale chips
254 using a CPM-based serial port. This assumes that the bootwrapper
255 has run, and set up the CPM in a particular way.
256
Albert Herranzd1d56f82009-12-12 06:31:51 +0000257config PPC_EARLY_DEBUG_USBGECKO
258 bool "Early debugging through the USB Gecko adapter"
259 depends on GAMECUBE_COMMON
260 select USBGECKO_UDBG
261 help
262 Select this to enable early debugging for Nintendo GameCube/Wii
263 consoles via an external USB Gecko adapter.
264
Michael Ellerman296167a2006-01-11 11:54:09 +1100265endchoice
266
David Gibsond9b55a02007-05-08 12:59:31 +1000267config PPC_EARLY_DEBUG_44x_PHYSLOW
268 hex "Low 32 bits of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200269 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000270 default "0x40000200"
Hugh Blemings6bbc5472007-12-21 15:39:28 +1100271 help
272 You probably want 0x40000200 for ebony boards and
273 0x40000300 for taishan
David Gibsond9b55a02007-05-08 12:59:31 +1000274
275config PPC_EARLY_DEBUG_44x_PHYSHIGH
276 hex "EPRN of early debug UART physical address"
Adrian Bunk247537b2007-09-26 20:02:52 +0200277 depends on PPC_EARLY_DEBUG_44x
David Gibsond9b55a02007-05-08 12:59:31 +1000278 default "0x1"
279
Benjamin Herrenschmidt9dae8af2007-12-21 15:39:26 +1100280config PPC_EARLY_DEBUG_40x_PHYSADDR
281 hex "Early debug UART physical address"
282 depends on PPC_EARLY_DEBUG_40x
283 default "0xef600300"
284
Scott Woodc374e002007-07-16 11:43:43 -0500285config PPC_EARLY_DEBUG_CPM_ADDR
286 hex "CPM UART early debug transmit descriptor address"
287 depends on PPC_EARLY_DEBUG_CPM
Scott Wood15f8c602007-09-28 14:06:16 -0500288 default "0xfa202008" if PPC_EP88XC
Laurent Pinchartc2dd3522008-04-10 17:01:59 +0200289 default "0xf0001ff8" if CPM2
Scott Wood15f8c602007-09-28 14:06:16 -0500290 default "0xff002008" if CPM1
Scott Woodc374e002007-07-16 11:43:43 -0500291 help
292 This specifies the address of the transmit descriptor
293 used for early debug output. Because it is needed before
294 platform probing is done, all platforms selected must
295 share the same address.
296
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000297endmenu