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
44 config CODE_PATCHING_SELFTEST
45 bool "Run self-tests of the code-patching code."
46 depends on DEBUG_KERNEL
49 config FTR_FIXUP_SELFTEST
50 bool "Run self-tests of the feature-fixup code."
51 depends on DEBUG_KERNEL
55 bool "Include xmon kernel debugger"
56 depends on DEBUG_KERNEL
58 Include in-kernel hooks for the xmon kernel monitor/debugger.
59 Unless you are intending to debug the kernel, say N here.
60 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
61 nothing will appear on the screen (xmon writes directly to the
63 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
64 very early during boot. 'xmon=on' will just enable the xmon
65 debugger hooks. 'xmon=off' will disable the debugger hooks
66 if CONFIG_XMON_DEFAULT is set.
67 xmon will print a backtrace on the very first invocation.
68 'xmon=nobt' will disable this autobacktrace.
71 bool "Enable xmon by default"
74 xmon is normally disabled unless booted with 'xmon=on'.
75 Use 'xmon=off' to disable xmon init during runtime.
77 config XMON_DISASSEMBLY
78 bool "Include disassembly support in xmon"
82 Include support for disassembling in xmon. You probably want
83 to say Y here, unless you're building for a memory-constrained
88 depends on KGDB || XMON
92 bool "Use separate kernel stacks when processing interrupts"
94 If you say Y here the kernel will use separate kernel stacks
95 for handling hard and soft interrupts. This can help avoid
96 overflowing the process kernel stacks.
99 bool "Expose hardware/virtual IRQ mapping via debugfs"
102 This option will show the mapping relationship between hardware irq
103 numbers and virtual irq numbers. The mapping is exposed via debugfs
104 in the file powerpc/virq_mapping.
106 If you don't know what this means you don't need it.
109 bool "Include BDI-2000 user context switcher"
110 depends on DEBUG_KERNEL && PPC32
112 Include in-kernel support for the Abatron BDI2000 debugger.
113 Unless you are intending to debug the kernel with one of these
114 machines, say N here.
117 bool "Support for early boot text console (BootX or OpenFirmware only)"
118 depends on PPC_OF && PPC_MULTIPLATFORM
120 Say Y here to see progress messages from the boot firmware in text
121 mode. Requires either BootX or Open Firmware.
123 config PPC_EARLY_DEBUG
124 bool "Early debugging (dangerous)"
125 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
126 # mark, which doesn't work with current 440 KVM.
129 Say Y to enable some early debugging facilities that may be available
130 for your processor/board combination. Those facilities are hacks
131 intended to debug problems early during boot, this should not be
132 enabled in a production kernel.
133 Note that enabling this will also cause the kernel default log level
134 to be pushed to max automatically very early during boot
137 prompt "Early debugging console"
138 depends on PPC_EARLY_DEBUG
140 Use the selected console for early debugging. Careful, if you
141 enable debugging for the wrong type of machine your kernel
144 config PPC_EARLY_DEBUG_LPAR
145 bool "LPAR HV Console"
146 depends on PPC_PSERIES
148 Select this to enable early debugging for a machine with a HVC
151 config PPC_EARLY_DEBUG_G5
153 depends on PPC_PMAC64
155 Select this to enable early debugging for Apple G5 machines.
157 config PPC_EARLY_DEBUG_RTAS_PANEL
161 Select this to enable early debugging via the RTAS panel.
163 config PPC_EARLY_DEBUG_RTAS_CONSOLE
166 select UDBG_RTAS_CONSOLE
168 Select this to enable early debugging via the RTAS console.
170 config PPC_EARLY_DEBUG_MAPLE
171 bool "Maple real mode"
174 Select this to enable early debugging for Maple.
176 config PPC_EARLY_DEBUG_ISERIES
177 bool "iSeries HV Console"
178 depends on PPC_ISERIES
180 Select this to enable early debugging for legacy iSeries. You need
181 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
183 config PPC_EARLY_DEBUG_PAS_REALMODE
184 bool "PA Semi real mode"
185 depends on PPC_PASEMI
187 Select this to enable early debugging for PA Semi.
188 Output will be on UART0.
190 config PPC_EARLY_DEBUG_BEAT
191 bool "Beat HV Console"
192 depends on PPC_CELLEB
195 Select this to enable early debugging for Celleb with Beat.
197 config PPC_EARLY_DEBUG_44x
198 bool "Early serial debugging for IBM/AMCC 44x CPUs"
201 Select this to enable early debugging for IBM 44x chips via the
202 inbuilt serial port. If you enable this, ensure you set
203 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
205 config PPC_EARLY_DEBUG_40x
206 bool "Early serial debugging for IBM/AMCC 40x CPUs"
209 Select this to enable early debugging for IBM 40x chips via the
210 inbuilt serial port. This works on chips with a 16550 compatible
211 UART. Xilinx chips with uartlite cannot use this option.
213 config PPC_EARLY_DEBUG_CPM
214 bool "Early serial debugging for Freescale CPM-based serial ports"
215 depends on SERIAL_CPM
216 select PIN_TLB if PPC_8xx
218 Select this to enable early debugging for Freescale chips
219 using a CPM-based serial port. This assumes that the bootwrapper
220 has run, and set up the CPM in a particular way.
224 config PPC_EARLY_DEBUG_44x_PHYSLOW
225 hex "Low 32 bits of early debug UART physical address"
226 depends on PPC_EARLY_DEBUG_44x
229 You probably want 0x40000200 for ebony boards and
230 0x40000300 for taishan
232 config PPC_EARLY_DEBUG_44x_PHYSHIGH
233 hex "EPRN of early debug UART physical address"
234 depends on PPC_EARLY_DEBUG_44x
237 config PPC_EARLY_DEBUG_40x_PHYSADDR
238 hex "Early debug UART physical address"
239 depends on PPC_EARLY_DEBUG_40x
242 config PPC_EARLY_DEBUG_CPM_ADDR
243 hex "CPM UART early debug transmit descriptor address"
244 depends on PPC_EARLY_DEBUG_CPM
245 default "0xfa202008" if PPC_EP88XC
246 default "0xf0001ff8" if CPM2
247 default "0xff002008" if CPM1
249 This specifies the address of the transmit descriptor
250 used for early debug output. Because it is needed before
251 platform probing is done, all platforms selected must
252 share the same address.