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
34 Unmap pages from the kernel linear mapping after free_pages().
35 This results in a large slowdown, but helps to find certain types
36 of memory corruptions.
40 bool "Hypervisor call instrumentation"
41 depends on PPC_PSERIES && DEBUG_FS
43 Adds code to keep track of the number of hypervisor calls made and
44 the amount of time spent in hypervisor calls. Wall time spent in
45 each call is always calculated, and if available CPU cycles spent
46 are also calculated. A directory named hcall_inst is added at the
47 root of the debugfs filesystem. Within the hcall_inst directory
48 are files that contain CPU specific call statistics.
50 This option will add a small amount of overhead to all hypervisor
53 config CODE_PATCHING_SELFTEST
54 bool "Run self-tests of the code-patching code."
55 depends on DEBUG_KERNEL
58 config FTR_FIXUP_SELFTEST
59 bool "Run self-tests of the feature-fixup code."
60 depends on DEBUG_KERNEL
63 config MSI_BITMAP_SELFTEST
64 bool "Run self-tests of the MSI bitmap code."
65 depends on DEBUG_KERNEL
69 bool "Include xmon kernel debugger"
70 depends on DEBUG_KERNEL
72 Include in-kernel hooks for the xmon kernel monitor/debugger.
73 Unless you are intending to debug the kernel, say N here.
74 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
75 nothing will appear on the screen (xmon writes directly to the
77 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
78 very early during boot. 'xmon=on' will just enable the xmon
79 debugger hooks. 'xmon=off' will disable the debugger hooks
80 if CONFIG_XMON_DEFAULT is set.
81 xmon will print a backtrace on the very first invocation.
82 'xmon=nobt' will disable this autobacktrace.
85 bool "Enable xmon by default"
88 xmon is normally disabled unless booted with 'xmon=on'.
89 Use 'xmon=off' to disable xmon init during runtime.
91 config XMON_DISASSEMBLY
92 bool "Include disassembly support in xmon"
96 Include support for disassembling in xmon. You probably want
97 to say Y here, unless you're building for a memory-constrained
102 depends on KGDB || XMON
106 bool "Use separate kernel stacks when processing interrupts"
108 If you say Y here the kernel will use separate kernel stacks
109 for handling hard and soft interrupts. This can help avoid
110 overflowing the process kernel stacks.
113 bool "Expose hardware/virtual IRQ mapping via debugfs"
116 This option will show the mapping relationship between hardware irq
117 numbers and virtual irq numbers. The mapping is exposed via debugfs
118 in the file powerpc/virq_mapping.
120 If you don't know what this means you don't need it.
123 bool "Include BDI-2000 user context switcher"
124 depends on DEBUG_KERNEL && PPC32
126 Include in-kernel support for the Abatron BDI2000 debugger.
127 Unless you are intending to debug the kernel with one of these
128 machines, say N here.
131 bool "Support for early boot text console (BootX or OpenFirmware only)"
132 depends on PPC_OF && PPC_BOOK3S
134 Say Y here to see progress messages from the boot firmware in text
135 mode. Requires either BootX or Open Firmware.
137 config PPC_EARLY_DEBUG
138 bool "Early debugging (dangerous)"
139 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
140 # mark, which doesn't work with current 440 KVM.
143 Say Y to enable some early debugging facilities that may be available
144 for your processor/board combination. Those facilities are hacks
145 intended to debug problems early during boot, this should not be
146 enabled in a production kernel.
147 Note that enabling this will also cause the kernel default log level
148 to be pushed to max automatically very early during boot
151 prompt "Early debugging console"
152 depends on PPC_EARLY_DEBUG
154 Use the selected console for early debugging. Careful, if you
155 enable debugging for the wrong type of machine your kernel
158 config PPC_EARLY_DEBUG_LPAR
159 bool "LPAR HV Console"
160 depends on PPC_PSERIES
162 Select this to enable early debugging for a machine with a HVC
165 config PPC_EARLY_DEBUG_G5
167 depends on PPC_PMAC64
169 Select this to enable early debugging for Apple G5 machines.
171 config PPC_EARLY_DEBUG_RTAS_PANEL
175 Select this to enable early debugging via the RTAS panel.
177 config PPC_EARLY_DEBUG_RTAS_CONSOLE
180 select UDBG_RTAS_CONSOLE
182 Select this to enable early debugging via the RTAS console.
184 config PPC_EARLY_DEBUG_MAPLE
185 bool "Maple real mode"
188 Select this to enable early debugging for Maple.
190 config PPC_EARLY_DEBUG_ISERIES
191 bool "iSeries HV Console"
192 depends on PPC_ISERIES
194 Select this to enable early debugging for legacy iSeries. You need
195 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
197 config PPC_EARLY_DEBUG_PAS_REALMODE
198 bool "PA Semi real mode"
199 depends on PPC_PASEMI
201 Select this to enable early debugging for PA Semi.
202 Output will be on UART0.
204 config PPC_EARLY_DEBUG_BEAT
205 bool "Beat HV Console"
206 depends on PPC_CELLEB
209 Select this to enable early debugging for Celleb with Beat.
211 config PPC_EARLY_DEBUG_44x
212 bool "Early serial debugging for IBM/AMCC 44x CPUs"
215 Select this to enable early debugging for IBM 44x chips via the
216 inbuilt serial port. If you enable this, ensure you set
217 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
219 config PPC_EARLY_DEBUG_40x
220 bool "Early serial debugging for IBM/AMCC 40x CPUs"
223 Select this to enable early debugging for IBM 40x chips via the
224 inbuilt serial port. This works on chips with a 16550 compatible
225 UART. Xilinx chips with uartlite cannot use this option.
227 config PPC_EARLY_DEBUG_CPM
228 bool "Early serial debugging for Freescale CPM-based serial ports"
229 depends on SERIAL_CPM
230 select PIN_TLB if PPC_8xx
232 Select this to enable early debugging for Freescale chips
233 using a CPM-based serial port. This assumes that the bootwrapper
234 has run, and set up the CPM in a particular way.
238 config PPC_EARLY_DEBUG_44x_PHYSLOW
239 hex "Low 32 bits of early debug UART physical address"
240 depends on PPC_EARLY_DEBUG_44x
243 You probably want 0x40000200 for ebony boards and
244 0x40000300 for taishan
246 config PPC_EARLY_DEBUG_44x_PHYSHIGH
247 hex "EPRN of early debug UART physical address"
248 depends on PPC_EARLY_DEBUG_44x
251 config PPC_EARLY_DEBUG_40x_PHYSADDR
252 hex "Early debug UART physical address"
253 depends on PPC_EARLY_DEBUG_40x
256 config PPC_EARLY_DEBUG_CPM_ADDR
257 hex "CPM UART early debug transmit descriptor address"
258 depends on PPC_EARLY_DEBUG_CPM
259 default "0xfa202008" if PPC_EP88XC
260 default "0xf0001ff8" if CPM2
261 default "0xff002008" if CPM1
263 This specifies the address of the transmit descriptor
264 used for early debug output. Because it is needed before
265 platform probing is done, all platforms selected must
266 share the same address.