3 source "lib/Kconfig.debug"
5 config DEBUG_STACKOVERFLOW
6 bool "Check for stack overflows"
7 depends on DEBUG_KERNEL
9 This option will cause messages to be printed if free stack space
10 drops below a certain limit.
12 config DEBUG_STACK_USAGE
13 bool "Stack utilization instrumentation"
14 depends on DEBUG_KERNEL
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.
19 This option will slow down process creation somewhat.
21 config DEBUG_PAGEALLOC
22 bool "Debug page memory allocations"
23 depends on DEBUG_KERNEL && !HIBERNATION
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.
31 bool "Hypervisor call instrumentation"
32 depends on PPC_PSERIES && DEBUG_FS
34 Adds code to keep track of the number of hypervisor calls made and
35 the amount of time spent in hypervisor calls. Wall time spent in
36 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.
41 This option will add a small amount of overhead to all hypervisor
45 bool "Enable debugger hooks"
46 depends on DEBUG_KERNEL
48 Include in-kernel hooks for kernel debuggers. Unless you are
49 intending to debug the kernel, say N here.
52 bool "Include kgdb kernel debugger"
53 depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx)
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.
60 config CODE_PATCHING_SELFTEST
61 bool "Run self-tests of the code-patching code."
62 depends on DEBUG_KERNEL
65 config FTR_FIXUP_SELFTEST
66 bool "Run self-tests of the feature-fixup code."
67 depends on DEBUG_KERNEL
90 bool "Enable serial console thru kgdb port"
91 depends on KGDB && 8xx || CPM2
93 If you enable this, all serial console messages will be sent
98 bool "Include xmon kernel debugger"
101 Include in-kernel hooks for the xmon kernel monitor/debugger.
102 Unless you are intending to debug the kernel, say N here.
103 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
104 nothing will appear on the screen (xmon writes directly to the
106 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
107 very early during boot. 'xmon=on' will just enable the xmon
108 debugger hooks. 'xmon=off' will disable the debugger hooks
109 if CONFIG_XMON_DEFAULT is set.
110 xmon will print a backtrace on the very first invocation.
111 'xmon=nobt' will disable this autobacktrace.
114 bool "Enable xmon by default"
117 xmon is normally disabled unless booted with 'xmon=on'.
118 Use 'xmon=off' to disable xmon init during runtime.
120 config XMON_DISASSEMBLY
121 bool "Include disassembly support in xmon"
125 Include support for disassembling in xmon. You probably want
126 to say Y here, unless you're building for a memory-constrained
130 bool "Use separate kernel stacks when processing interrupts"
132 If you say Y here the kernel will use separate kernel stacks
133 for handling hard and soft interrupts. This can help avoid
134 overflowing the process kernel stacks.
137 bool "Expose hardware/virtual IRQ mapping via debugfs"
138 depends on DEBUG_FS && PPC_MERGE
140 This option will show the mapping relationship between hardware irq
141 numbers and virtual irq numbers. The mapping is exposed via debugfs
142 in the file powerpc/virq_mapping.
144 If you don't know what this means you don't need it.
147 bool "Include BDI-2000 user context switcher"
148 depends on DEBUG_KERNEL && PPC32
150 Include in-kernel support for the Abatron BDI2000 debugger.
151 Unless you are intending to debug the kernel with one of these
152 machines, say N here.
155 bool "Support for early boot text console (BootX or OpenFirmware only)"
156 depends on PPC_OF && PPC_MULTIPLATFORM
158 Say Y here to see progress messages from the boot firmware in text
159 mode. Requires either BootX or Open Firmware.
161 config PPC_EARLY_DEBUG
162 bool "Early debugging (dangerous)"
163 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
164 # mark, which doesn't work with current 440 KVM.
167 Say Y to enable some early debugging facilities that may be available
168 for your processor/board combination. Those facilities are hacks
169 intended to debug problems early during boot, this should not be
170 enabled in a production kernel.
171 Note that enabling this will also cause the kernel default log level
172 to be pushed to max automatically very early during boot
175 prompt "Early debugging console"
176 depends on PPC_EARLY_DEBUG
178 Use the selected console for early debugging. Careful, if you
179 enable debugging for the wrong type of machine your kernel
182 config PPC_EARLY_DEBUG_LPAR
183 bool "LPAR HV Console"
184 depends on PPC_PSERIES
186 Select this to enable early debugging for a machine with a HVC
189 config PPC_EARLY_DEBUG_G5
191 depends on PPC_PMAC64
193 Select this to enable early debugging for Apple G5 machines.
195 config PPC_EARLY_DEBUG_RTAS_PANEL
199 Select this to enable early debugging via the RTAS panel.
201 config PPC_EARLY_DEBUG_RTAS_CONSOLE
204 select UDBG_RTAS_CONSOLE
206 Select this to enable early debugging via the RTAS console.
208 config PPC_EARLY_DEBUG_MAPLE
209 bool "Maple real mode"
212 Select this to enable early debugging for Maple.
214 config PPC_EARLY_DEBUG_ISERIES
215 bool "iSeries HV Console"
216 depends on PPC_ISERIES
218 Select this to enable early debugging for legacy iSeries. You need
219 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
221 config PPC_EARLY_DEBUG_PAS_REALMODE
222 bool "PA Semi real mode"
223 depends on PPC_PASEMI
225 Select this to enable early debugging for PA Semi.
226 Output will be on UART0.
228 config PPC_EARLY_DEBUG_BEAT
229 bool "Beat HV Console"
230 depends on PPC_CELLEB
233 Select this to enable early debugging for Celleb with Beat.
235 config PPC_EARLY_DEBUG_44x
236 bool "Early serial debugging for IBM/AMCC 44x CPUs"
239 Select this to enable early debugging for IBM 44x chips via the
240 inbuilt serial port. If you enable this, ensure you set
241 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
243 config PPC_EARLY_DEBUG_40x
244 bool "Early serial debugging for IBM/AMCC 40x CPUs"
247 Select this to enable early debugging for IBM 40x chips via the
248 inbuilt serial port. This works on chips with a 16550 compatible
249 UART. Xilinx chips with uartlite cannot use this option.
251 config PPC_EARLY_DEBUG_CPM
252 bool "Early serial debugging for Freescale CPM-based serial ports"
253 depends on SERIAL_CPM
254 select PIN_TLB if PPC_8xx
256 Select this to enable early debugging for Freescale chips
257 using a CPM-based serial port. This assumes that the bootwrapper
258 has run, and set up the CPM in a particular way.
262 config PPC_EARLY_DEBUG_44x_PHYSLOW
263 hex "Low 32 bits of early debug UART physical address"
264 depends on PPC_EARLY_DEBUG_44x
267 You probably want 0x40000200 for ebony boards and
268 0x40000300 for taishan
270 config PPC_EARLY_DEBUG_44x_PHYSHIGH
271 hex "EPRN of early debug UART physical address"
272 depends on PPC_EARLY_DEBUG_44x
275 config PPC_EARLY_DEBUG_40x_PHYSADDR
276 hex "Early debug UART physical address"
277 depends on PPC_EARLY_DEBUG_40x
280 config PPC_EARLY_DEBUG_CPM_ADDR
281 hex "CPM UART early debug transmit descriptor address"
282 depends on PPC_EARLY_DEBUG_CPM
283 default "0xfa202008" if PPC_EP88XC
284 default "0xf0001ff8" if CPM2
285 default "0xff002008" if CPM1
287 This specifies the address of the transmit descriptor
288 used for early debug output. Because it is needed before
289 platform probing is done, all platforms selected must
290 share the same address.