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
85 bool "Enable serial console thru kgdb port"
86 depends on KGDB && 8xx || CPM2
88 If you enable this, all serial console messages will be sent
93 bool "Include xmon kernel debugger"
96 Include in-kernel hooks for the xmon kernel monitor/debugger.
97 Unless you are intending to debug the kernel, say N here.
98 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
99 nothing will appear on the screen (xmon writes directly to the
101 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
102 very early during boot. 'xmon=on' will just enable the xmon
103 debugger hooks. 'xmon=off' will disable the debugger hooks
104 if CONFIG_XMON_DEFAULT is set.
105 xmon will print a backtrace on the very first invocation.
106 'xmon=nobt' will disable this autobacktrace.
109 bool "Enable xmon by default"
112 xmon is normally disabled unless booted with 'xmon=on'.
113 Use 'xmon=off' to disable xmon init during runtime.
115 config XMON_DISASSEMBLY
116 bool "Include disassembly support in xmon"
120 Include support for disassembling in xmon. You probably want
121 to say Y here, unless you're building for a memory-constrained
125 bool "Use separate kernel stacks when processing interrupts"
127 If you say Y here the kernel will use separate kernel stacks
128 for handling hard and soft interrupts. This can help avoid
129 overflowing the process kernel stacks.
132 bool "Expose hardware/virtual IRQ mapping via debugfs"
133 depends on DEBUG_FS && PPC_MERGE
135 This option will show the mapping relationship between hardware irq
136 numbers and virtual irq numbers. The mapping is exposed via debugfs
137 in the file powerpc/virq_mapping.
139 If you don't know what this means you don't need it.
142 bool "Include BDI-2000 user context switcher"
143 depends on DEBUG_KERNEL && PPC32
145 Include in-kernel support for the Abatron BDI2000 debugger.
146 Unless you are intending to debug the kernel with one of these
147 machines, say N here.
150 bool "Support for early boot text console (BootX or OpenFirmware only)"
151 depends on PPC_OF && PPC_MULTIPLATFORM
153 Say Y here to see progress messages from the boot firmware in text
154 mode. Requires either BootX or Open Firmware.
156 config PPC_EARLY_DEBUG
157 bool "Early debugging (dangerous)"
158 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
159 # mark, which doesn't work with current 440 KVM.
162 Say Y to enable some early debugging facilities that may be available
163 for your processor/board combination. Those facilities are hacks
164 intended to debug problems early during boot, this should not be
165 enabled in a production kernel.
166 Note that enabling this will also cause the kernel default log level
167 to be pushed to max automatically very early during boot
170 prompt "Early debugging console"
171 depends on PPC_EARLY_DEBUG
173 Use the selected console for early debugging. Careful, if you
174 enable debugging for the wrong type of machine your kernel
177 config PPC_EARLY_DEBUG_LPAR
178 bool "LPAR HV Console"
179 depends on PPC_PSERIES
181 Select this to enable early debugging for a machine with a HVC
184 config PPC_EARLY_DEBUG_G5
186 depends on PPC_PMAC64
188 Select this to enable early debugging for Apple G5 machines.
190 config PPC_EARLY_DEBUG_RTAS_PANEL
194 Select this to enable early debugging via the RTAS panel.
196 config PPC_EARLY_DEBUG_RTAS_CONSOLE
199 select UDBG_RTAS_CONSOLE
201 Select this to enable early debugging via the RTAS console.
203 config PPC_EARLY_DEBUG_MAPLE
204 bool "Maple real mode"
207 Select this to enable early debugging for Maple.
209 config PPC_EARLY_DEBUG_ISERIES
210 bool "iSeries HV Console"
211 depends on PPC_ISERIES
213 Select this to enable early debugging for legacy iSeries. You need
214 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
216 config PPC_EARLY_DEBUG_PAS_REALMODE
217 bool "PA Semi real mode"
218 depends on PPC_PASEMI
220 Select this to enable early debugging for PA Semi.
221 Output will be on UART0.
223 config PPC_EARLY_DEBUG_BEAT
224 bool "Beat HV Console"
225 depends on PPC_CELLEB
228 Select this to enable early debugging for Celleb with Beat.
230 config PPC_EARLY_DEBUG_44x
231 bool "Early serial debugging for IBM/AMCC 44x CPUs"
234 Select this to enable early debugging for IBM 44x chips via the
235 inbuilt serial port. If you enable this, ensure you set
236 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
238 config PPC_EARLY_DEBUG_40x
239 bool "Early serial debugging for IBM/AMCC 40x CPUs"
242 Select this to enable early debugging for IBM 40x chips via the
243 inbuilt serial port. This works on chips with a 16550 compatible
244 UART. Xilinx chips with uartlite cannot use this option.
246 config PPC_EARLY_DEBUG_CPM
247 bool "Early serial debugging for Freescale CPM-based serial ports"
248 depends on SERIAL_CPM
249 select PIN_TLB if PPC_8xx
251 Select this to enable early debugging for Freescale chips
252 using a CPM-based serial port. This assumes that the bootwrapper
253 has run, and set up the CPM in a particular way.
257 config PPC_EARLY_DEBUG_44x_PHYSLOW
258 hex "Low 32 bits of early debug UART physical address"
259 depends on PPC_EARLY_DEBUG_44x
262 You probably want 0x40000200 for ebony boards and
263 0x40000300 for taishan
265 config PPC_EARLY_DEBUG_44x_PHYSHIGH
266 hex "EPRN of early debug UART physical address"
267 depends on PPC_EARLY_DEBUG_44x
270 config PPC_EARLY_DEBUG_40x_PHYSADDR
271 hex "Early debug UART physical address"
272 depends on PPC_EARLY_DEBUG_40x
275 config PPC_EARLY_DEBUG_CPM_ADDR
276 hex "CPM UART early debug transmit descriptor address"
277 depends on PPC_EARLY_DEBUG_CPM
278 default "0xfa202008" if PPC_EP88XC
279 default "0xf0001ff8" if CPM2
280 default "0xff002008" if CPM1
282 This specifies the address of the transmit descriptor
283 used for early debug output. Because it is needed before
284 platform probing is done, all platforms selected must
285 share the same address.