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
54 config MSI_BITMAP_SELFTEST
55 bool "Run self-tests of the MSI bitmap code."
56 depends on DEBUG_KERNEL
60 bool "Include xmon kernel debugger"
61 depends on DEBUG_KERNEL
63 Include in-kernel hooks for the xmon kernel monitor/debugger.
64 Unless you are intending to debug the kernel, say N here.
65 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
66 nothing will appear on the screen (xmon writes directly to the
68 The cmdline option 'xmon' or 'xmon=early' will drop into xmon
69 very early during boot. 'xmon=on' will just enable the xmon
70 debugger hooks. 'xmon=off' will disable the debugger hooks
71 if CONFIG_XMON_DEFAULT is set.
72 xmon will print a backtrace on the very first invocation.
73 'xmon=nobt' will disable this autobacktrace.
76 bool "Enable xmon by default"
79 xmon is normally disabled unless booted with 'xmon=on'.
80 Use 'xmon=off' to disable xmon init during runtime.
82 config XMON_DISASSEMBLY
83 bool "Include disassembly support in xmon"
87 Include support for disassembling in xmon. You probably want
88 to say Y here, unless you're building for a memory-constrained
93 depends on KGDB || XMON
97 bool "Use separate kernel stacks when processing interrupts"
99 If you say Y here the kernel will use separate kernel stacks
100 for handling hard and soft interrupts. This can help avoid
101 overflowing the process kernel stacks.
104 bool "Expose hardware/virtual IRQ mapping via debugfs"
107 This option will show the mapping relationship between hardware irq
108 numbers and virtual irq numbers. The mapping is exposed via debugfs
109 in the file powerpc/virq_mapping.
111 If you don't know what this means you don't need it.
114 bool "Include BDI-2000 user context switcher"
115 depends on DEBUG_KERNEL && PPC32
117 Include in-kernel support for the Abatron BDI2000 debugger.
118 Unless you are intending to debug the kernel with one of these
119 machines, say N here.
122 bool "Support for early boot text console (BootX or OpenFirmware only)"
123 depends on PPC_OF && PPC_MULTIPLATFORM
125 Say Y here to see progress messages from the boot firmware in text
126 mode. Requires either BootX or Open Firmware.
128 config PPC_EARLY_DEBUG
129 bool "Early debugging (dangerous)"
130 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
131 # mark, which doesn't work with current 440 KVM.
134 Say Y to enable some early debugging facilities that may be available
135 for your processor/board combination. Those facilities are hacks
136 intended to debug problems early during boot, this should not be
137 enabled in a production kernel.
138 Note that enabling this will also cause the kernel default log level
139 to be pushed to max automatically very early during boot
142 prompt "Early debugging console"
143 depends on PPC_EARLY_DEBUG
145 Use the selected console for early debugging. Careful, if you
146 enable debugging for the wrong type of machine your kernel
149 config PPC_EARLY_DEBUG_LPAR
150 bool "LPAR HV Console"
151 depends on PPC_PSERIES
153 Select this to enable early debugging for a machine with a HVC
156 config PPC_EARLY_DEBUG_G5
158 depends on PPC_PMAC64
160 Select this to enable early debugging for Apple G5 machines.
162 config PPC_EARLY_DEBUG_RTAS_PANEL
166 Select this to enable early debugging via the RTAS panel.
168 config PPC_EARLY_DEBUG_RTAS_CONSOLE
171 select UDBG_RTAS_CONSOLE
173 Select this to enable early debugging via the RTAS console.
175 config PPC_EARLY_DEBUG_MAPLE
176 bool "Maple real mode"
179 Select this to enable early debugging for Maple.
181 config PPC_EARLY_DEBUG_ISERIES
182 bool "iSeries HV Console"
183 depends on PPC_ISERIES
185 Select this to enable early debugging for legacy iSeries. You need
186 to hit "Ctrl-x Ctrl-x" to see the messages on the console.
188 config PPC_EARLY_DEBUG_PAS_REALMODE
189 bool "PA Semi real mode"
190 depends on PPC_PASEMI
192 Select this to enable early debugging for PA Semi.
193 Output will be on UART0.
195 config PPC_EARLY_DEBUG_BEAT
196 bool "Beat HV Console"
197 depends on PPC_CELLEB
200 Select this to enable early debugging for Celleb with Beat.
202 config PPC_EARLY_DEBUG_44x
203 bool "Early serial debugging for IBM/AMCC 44x CPUs"
206 Select this to enable early debugging for IBM 44x chips via the
207 inbuilt serial port. If you enable this, ensure you set
208 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
210 config PPC_EARLY_DEBUG_40x
211 bool "Early serial debugging for IBM/AMCC 40x CPUs"
214 Select this to enable early debugging for IBM 40x chips via the
215 inbuilt serial port. This works on chips with a 16550 compatible
216 UART. Xilinx chips with uartlite cannot use this option.
218 config PPC_EARLY_DEBUG_CPM
219 bool "Early serial debugging for Freescale CPM-based serial ports"
220 depends on SERIAL_CPM
221 select PIN_TLB if PPC_8xx
223 Select this to enable early debugging for Freescale chips
224 using a CPM-based serial port. This assumes that the bootwrapper
225 has run, and set up the CPM in a particular way.
229 config PPC_EARLY_DEBUG_44x_PHYSLOW
230 hex "Low 32 bits of early debug UART physical address"
231 depends on PPC_EARLY_DEBUG_44x
234 You probably want 0x40000200 for ebony boards and
235 0x40000300 for taishan
237 config PPC_EARLY_DEBUG_44x_PHYSHIGH
238 hex "EPRN of early debug UART physical address"
239 depends on PPC_EARLY_DEBUG_44x
242 config PPC_EARLY_DEBUG_40x_PHYSADDR
243 hex "Early debug UART physical address"
244 depends on PPC_EARLY_DEBUG_40x
247 config PPC_EARLY_DEBUG_CPM_ADDR
248 hex "CPM UART early debug transmit descriptor address"
249 depends on PPC_EARLY_DEBUG_CPM
250 default "0xfa202008" if PPC_EP88XC
251 default "0xf0001ff8" if CPM2
252 default "0xff002008" if CPM1
254 This specifies the address of the transmit descriptor
255 used for early debug output. Because it is needed before
256 platform probing is done, all platforms selected must
257 share the same address.