3 source "lib/Kconfig.debug"
5 config PRINT_STACK_DEPTH
6 int "Stack depth to print" if DEBUG_KERNEL
9 This option allows you to set the stack depth that the kernel
10 prints in stack traces. This can be useful if your display is
11 too small and stack traces cause important information to
12 scroll off the screen.
14 config DEBUG_STACKOVERFLOW
15 bool "Check for stack overflows"
16 depends on DEBUG_KERNEL
18 This option will cause messages to be printed if free stack space
19 drops below a certain limit.
21 config DEBUG_STACK_USAGE
22 bool "Stack utilization instrumentation"
23 depends on DEBUG_KERNEL
25 Enables the display of the minimum amount of free stack which each
26 task has ever had available in the sysrq-T and sysrq-P debug output.
28 This option will slow down process creation somewhat.
30 config DEBUG_PAGEALLOC
31 bool "Debug page memory allocations"
32 depends on DEBUG_KERNEL && !HIBERNATION
33 depends on ARCH_SUPPORTS_DEBUG_PAGEALLOC
35 Unmap pages from the kernel linear mapping after free_pages().
36 This results in a large slowdown, but helps to find certain types
37 of memory corruptions.
41 bool "Hypervisor call instrumentation"
42 depends on PPC_PSERIES && DEBUG_FS
44 Adds code to keep track of the number of hypervisor calls made and
45 the amount of time spent in hypervisor calls. Wall time spent in
46 each call is always calculated, and if available CPU cycles spent
47 are also calculated. A directory named hcall_inst is added at the
48 root of the debugfs filesystem. Within the hcall_inst directory
49 are files that contain CPU specific call statistics.
51 This option will add a small amount of overhead to all hypervisor
54 config CODE_PATCHING_SELFTEST
55 bool "Run self-tests of the code-patching code."
56 depends on DEBUG_KERNEL
59 config FTR_FIXUP_SELFTEST
60 bool "Run self-tests of the feature-fixup code."
61 depends on DEBUG_KERNEL
64 config MSI_BITMAP_SELFTEST
65 bool "Run self-tests of the MSI bitmap code."
66 depends on DEBUG_KERNEL
70 bool "Include xmon kernel debugger"
71 depends on DEBUG_KERNEL
73 Include in-kernel hooks for the xmon kernel monitor/debugger.
74 Unless you are intending to debug the kernel, say N here.
75 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
76 nothing will appear on the screen (xmon writes directly to the
78 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
79 very early during boot. 'xmon=on' will just enable the xmon
80 debugger hooks. 'xmon=off' will disable the debugger hooks
81 if CONFIG_XMON_DEFAULT is set.
82 xmon will print a backtrace on the very first invocation.
83 'xmon=nobt' will disable this autobacktrace.
86 bool "Enable xmon by default"
89 xmon is normally disabled unless booted with 'xmon=on'.
90 Use 'xmon=off' to disable xmon init during runtime.
92 config XMON_DISASSEMBLY
93 bool "Include disassembly support in xmon"
97 Include support for disassembling in xmon. You probably want
98 to say Y here, unless you're building for a memory-constrained
103 depends on KGDB || XMON
107 bool "Use separate kernel stacks when processing interrupts"
109 If you say Y here the kernel will use separate kernel stacks
110 for handling hard and soft interrupts. This can help avoid
111 overflowing the process kernel stacks.
114 bool "Expose hardware/virtual IRQ mapping via debugfs"
117 This option will show the mapping relationship between hardware irq
118 numbers and virtual irq numbers. The mapping is exposed via debugfs
119 in the file powerpc/virq_mapping.
121 If you don't know what this means you don't need it.
124 bool "Include BDI-2000 user context switcher"
125 depends on DEBUG_KERNEL && PPC32
127 Include in-kernel support for the Abatron BDI2000 debugger.
128 Unless you are intending to debug the kernel with one of these
129 machines, say N here.
132 bool "Support for early boot text console (BootX or OpenFirmware only)"
133 depends on PPC_OF && PPC_BOOK3S
135 Say Y here to see progress messages from the boot firmware in text
136 mode. Requires either BootX or Open Firmware.
138 config PPC_EARLY_DEBUG
139 bool "Early debugging (dangerous)"
140 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
141 # mark, which doesn't work with current 440 KVM.
144 Say Y to enable some early debugging facilities that may be available
145 for your processor/board combination. Those facilities are hacks
146 intended to debug problems early during boot, this should not be
147 enabled in a production kernel.
148 Note that enabling this will also cause the kernel default log level
149 to be pushed to max automatically very early during boot
152 prompt "Early debugging console"
153 depends on PPC_EARLY_DEBUG
155 Use the selected console for early debugging. Careful, if you
156 enable debugging for the wrong type of machine your kernel
159 config PPC_EARLY_DEBUG_LPAR
160 bool "LPAR HV Console"
161 depends on PPC_PSERIES
163 Select this to enable early debugging for a machine with a HVC
166 config PPC_EARLY_DEBUG_G5
168 depends on PPC_PMAC64
170 Select this to enable early debugging for Apple G5 machines.
172 config PPC_EARLY_DEBUG_RTAS_PANEL
176 Select this to enable early debugging via the RTAS panel.
178 config PPC_EARLY_DEBUG_RTAS_CONSOLE
181 select UDBG_RTAS_CONSOLE
183 Select this to enable early debugging via the RTAS console.
185 config PPC_EARLY_DEBUG_MAPLE
186 bool "Maple real mode"
189 Select this to enable early debugging for Maple.
191 config PPC_EARLY_DEBUG_ISERIES
192 bool "iSeries HV Console"
193 depends on PPC_ISERIES
195 Select this to enable early debugging for legacy iSeries. You need
196 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
198 config PPC_EARLY_DEBUG_PAS_REALMODE
199 bool "PA Semi real mode"
200 depends on PPC_PASEMI
202 Select this to enable early debugging for PA Semi.
203 Output will be on UART0.
205 config PPC_EARLY_DEBUG_BEAT
206 bool "Beat HV Console"
207 depends on PPC_CELLEB
210 Select this to enable early debugging for Celleb with Beat.
212 config PPC_EARLY_DEBUG_44x
213 bool "Early serial debugging for IBM/AMCC 44x CPUs"
216 Select this to enable early debugging for IBM 44x chips via the
217 inbuilt serial port. If you enable this, ensure you set
218 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
220 config PPC_EARLY_DEBUG_40x
221 bool "Early serial debugging for IBM/AMCC 40x CPUs"
224 Select this to enable early debugging for IBM 40x chips via the
225 inbuilt serial port. This works on chips with a 16550 compatible
226 UART. Xilinx chips with uartlite cannot use this option.
228 config PPC_EARLY_DEBUG_CPM
229 bool "Early serial debugging for Freescale CPM-based serial ports"
230 depends on SERIAL_CPM
231 select PIN_TLB if PPC_8xx
233 Select this to enable early debugging for Freescale chips
234 using a CPM-based serial port. This assumes that the bootwrapper
235 has run, and set up the CPM in a particular way.
239 config PPC_EARLY_DEBUG_44x_PHYSLOW
240 hex "Low 32 bits of early debug UART physical address"
241 depends on PPC_EARLY_DEBUG_44x
244 You probably want 0x40000200 for ebony boards and
245 0x40000300 for taishan
247 config PPC_EARLY_DEBUG_44x_PHYSHIGH
248 hex "EPRN of early debug UART physical address"
249 depends on PPC_EARLY_DEBUG_44x
252 config PPC_EARLY_DEBUG_40x_PHYSADDR
253 hex "Early debug UART physical address"
254 depends on PPC_EARLY_DEBUG_40x
257 config PPC_EARLY_DEBUG_CPM_ADDR
258 hex "CPM UART early debug transmit descriptor address"
259 depends on PPC_EARLY_DEBUG_CPM
260 default "0xfa202008" if PPC_EP88XC
261 default "0xf0001ff8" if CPM2
262 default "0xff002008" if CPM1
264 This specifies the address of the transmit descriptor
265 used for early debug output. Because it is needed before
266 platform probing is done, all platforms selected must
267 share the same address.