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