1menu "Kernel hacking" 2 3source "lib/Kconfig.debug" 4 5config PPC_DISABLE_WERROR 6 bool "Don't build arch/powerpc code with -Werror" 7 default n 8 help 9 This option tells the compiler NOT to build the code under 10 arch/powerpc with the -Werror flag (which means warnings 11 are treated as errors). 12 13 Only enable this if you are hitting a build failure in the 14 arch/powerpc code caused by a warning, and you don't feel 15 inclined to fix it. 16 17config PPC_WERROR 18 bool 19 depends on !PPC_DISABLE_WERROR 20 default y 21 22config PRINT_STACK_DEPTH 23 int "Stack depth to print" if DEBUG_KERNEL 24 default 64 25 help 26 This option allows you to set the stack depth that the kernel 27 prints in stack traces. This can be useful if your display is 28 too small and stack traces cause important information to 29 scroll off the screen. 30 31config DEBUG_STACKOVERFLOW 32 bool "Check for stack overflows" 33 depends on DEBUG_KERNEL 34 help 35 This option will cause messages to be printed if free stack space 36 drops below a certain limit. 37 38config DEBUG_STACK_USAGE 39 bool "Stack utilization instrumentation" 40 depends on DEBUG_KERNEL 41 help 42 Enables the display of the minimum amount of free stack which each 43 task has ever had available in the sysrq-T and sysrq-P debug output. 44 45 This option will slow down process creation somewhat. 46 47config DEBUG_PER_CPU_MAPS 48 bool "Debug access to per_cpu maps" 49 depends on DEBUG_KERNEL 50 depends on SMP 51 default n 52 ---help--- 53 Say Y to verify that the per_cpu map being accessed has 54 been setup. Adds a fair amount of code to kernel memory 55 and decreases performance. 56 57 Say N if unsure. 58 59config HCALL_STATS 60 bool "Hypervisor call instrumentation" 61 depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS 62 help 63 Adds code to keep track of the number of hypervisor calls made and 64 the amount of time spent in hypervisor calls. Wall time spent in 65 each call is always calculated, and if available CPU cycles spent 66 are also calculated. A directory named hcall_inst is added at the 67 root of the debugfs filesystem. Within the hcall_inst directory 68 are files that contain CPU specific call statistics. 69 70 This option will add a small amount of overhead to all hypervisor 71 calls. 72 73config PPC_EMULATED_STATS 74 bool "Emulated instructions tracking" 75 depends on DEBUG_FS 76 help 77 Adds code to keep track of the number of instructions that are 78 emulated by the in-kernel emulator. Counters for the various classes 79 of emulated instructions are available under 80 powerpc/emulated_instructions/ in the root of the debugfs file 81 system. Optionally (controlled by 82 powerpc/emulated_instructions/do_warn in debugfs), rate-limited 83 warnings can be printed to the console when instructions are 84 emulated. 85 86config CODE_PATCHING_SELFTEST 87 bool "Run self-tests of the code-patching code." 88 depends on DEBUG_KERNEL 89 default n 90 91config FTR_FIXUP_SELFTEST 92 bool "Run self-tests of the feature-fixup code." 93 depends on DEBUG_KERNEL 94 default n 95 96config MSI_BITMAP_SELFTEST 97 bool "Run self-tests of the MSI bitmap code." 98 depends on DEBUG_KERNEL 99 default n 100 101config XMON 102 bool "Include xmon kernel debugger" 103 depends on DEBUG_KERNEL 104 help 105 Include in-kernel hooks for the xmon kernel monitor/debugger. 106 Unless you are intending to debug the kernel, say N here. 107 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise 108 nothing will appear on the screen (xmon writes directly to the 109 framebuffer memory). 110 The cmdline option 'xmon' or 'xmon=early' will drop into xmon 111 very early during boot. 'xmon=on' will just enable the xmon 112 debugger hooks. 'xmon=off' will disable the debugger hooks 113 if CONFIG_XMON_DEFAULT is set. 114 xmon will print a backtrace on the very first invocation. 115 'xmon=nobt' will disable this autobacktrace. 116 117config XMON_DEFAULT 118 bool "Enable xmon by default" 119 depends on XMON 120 help 121 xmon is normally disabled unless booted with 'xmon=on'. 122 Use 'xmon=off' to disable xmon init during runtime. 123 124config XMON_DISASSEMBLY 125 bool "Include disassembly support in xmon" 126 depends on XMON 127 default y 128 help 129 Include support for disassembling in xmon. You probably want 130 to say Y here, unless you're building for a memory-constrained 131 system. 132 133config DEBUGGER 134 bool 135 depends on KGDB || XMON 136 default y 137 138config VIRQ_DEBUG 139 bool "Expose hardware/virtual IRQ mapping via debugfs" 140 depends on DEBUG_FS 141 help 142 This option will show the mapping relationship between hardware irq 143 numbers and virtual irq numbers. The mapping is exposed via debugfs 144 in the file powerpc/virq_mapping. 145 146 If you don't know what this means you don't need it. 147 148config BDI_SWITCH 149 bool "Include BDI-2000 user context switcher" 150 depends on DEBUG_KERNEL && PPC32 151 help 152 Include in-kernel support for the Abatron BDI2000 debugger. 153 Unless you are intending to debug the kernel with one of these 154 machines, say N here. 155 156config BOOTX_TEXT 157 bool "Support for early boot text console (BootX or OpenFirmware only)" 158 depends on PPC_OF && PPC_BOOK3S 159 help 160 Say Y here to see progress messages from the boot firmware in text 161 mode. Requires either BootX or Open Firmware. 162 163config PPC_EARLY_DEBUG 164 bool "Early debugging (dangerous)" 165 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water 166 # mark, which doesn't work with current 440 KVM. 167 depends on !KVM 168 help 169 Say Y to enable some early debugging facilities that may be available 170 for your processor/board combination. Those facilities are hacks 171 intended to debug problems early during boot, this should not be 172 enabled in a production kernel. 173 Note that enabling this will also cause the kernel default log level 174 to be pushed to max automatically very early during boot 175 176choice 177 prompt "Early debugging console" 178 depends on PPC_EARLY_DEBUG 179 help 180 Use the selected console for early debugging. Careful, if you 181 enable debugging for the wrong type of machine your kernel 182 _will not boot_. 183 184config PPC_EARLY_DEBUG_LPAR 185 bool "LPAR HV Console" 186 depends on PPC_PSERIES 187 help 188 Select this to enable early debugging for a machine with a HVC 189 console on vterm 0. 190 191config PPC_EARLY_DEBUG_G5 192 bool "Apple G5" 193 depends on PPC_PMAC64 194 help 195 Select this to enable early debugging for Apple G5 machines. 196 197config PPC_EARLY_DEBUG_RTAS_PANEL 198 bool "RTAS Panel" 199 depends on PPC_RTAS 200 help 201 Select this to enable early debugging via the RTAS panel. 202 203config PPC_EARLY_DEBUG_RTAS_CONSOLE 204 bool "RTAS Console" 205 depends on PPC_RTAS 206 select UDBG_RTAS_CONSOLE 207 help 208 Select this to enable early debugging via the RTAS console. 209 210config PPC_EARLY_DEBUG_MAPLE 211 bool "Maple real mode" 212 depends on PPC_MAPLE 213 help 214 Select this to enable early debugging for Maple. 215 216config PPC_EARLY_DEBUG_ISERIES 217 bool "iSeries HV Console" 218 depends on PPC_ISERIES 219 help 220 Select this to enable early debugging for legacy iSeries. You need 221 to hit "Ctrl-x Ctrl-x" to see the messages on the console. 222 223config PPC_EARLY_DEBUG_PAS_REALMODE 224 bool "PA Semi real mode" 225 depends on PPC_PASEMI 226 help 227 Select this to enable early debugging for PA Semi. 228 Output will be on UART0. 229 230config PPC_EARLY_DEBUG_BEAT 231 bool "Beat HV Console" 232 depends on PPC_CELLEB 233 select PPC_UDBG_BEAT 234 help 235 Select this to enable early debugging for Celleb with Beat. 236 237config PPC_EARLY_DEBUG_44x 238 bool "Early serial debugging for IBM/AMCC 44x CPUs" 239 depends on 44x 240 help 241 Select this to enable early debugging for IBM 44x chips via the 242 inbuilt serial port. If you enable this, ensure you set 243 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. 244 245config PPC_EARLY_DEBUG_40x 246 bool "Early serial debugging for IBM/AMCC 40x CPUs" 247 depends on 40x 248 help 249 Select this to enable early debugging for IBM 40x chips via the 250 inbuilt serial port. This works on chips with a 16550 compatible 251 UART. Xilinx chips with uartlite cannot use this option. 252 253config PPC_EARLY_DEBUG_CPM 254 bool "Early serial debugging for Freescale CPM-based serial ports" 255 depends on SERIAL_CPM 256 select PIN_TLB if PPC_8xx 257 help 258 Select this to enable early debugging for Freescale chips 259 using a CPM-based serial port. This assumes that the bootwrapper 260 has run, and set up the CPM in a particular way. 261 262config PPC_EARLY_DEBUG_USBGECKO 263 bool "Early debugging through the USB Gecko adapter" 264 depends on GAMECUBE_COMMON 265 select USBGECKO_UDBG 266 help 267 Select this to enable early debugging for Nintendo GameCube/Wii 268 consoles via an external USB Gecko adapter. 269 270endchoice 271 272config PPC_EARLY_DEBUG_44x_PHYSLOW 273 hex "Low 32 bits of early debug UART physical address" 274 depends on PPC_EARLY_DEBUG_44x 275 default "0x40000200" 276 help 277 You probably want 0x40000200 for ebony boards and 278 0x40000300 for taishan 279 280config PPC_EARLY_DEBUG_44x_PHYSHIGH 281 hex "EPRN of early debug UART physical address" 282 depends on PPC_EARLY_DEBUG_44x 283 default "0x1" 284 285config PPC_EARLY_DEBUG_40x_PHYSADDR 286 hex "Early debug UART physical address" 287 depends on PPC_EARLY_DEBUG_40x 288 default "0xef600300" 289 290config PPC_EARLY_DEBUG_CPM_ADDR 291 hex "CPM UART early debug transmit descriptor address" 292 depends on PPC_EARLY_DEBUG_CPM 293 default "0xfa202008" if PPC_EP88XC 294 default "0xf0001ff8" if CPM2 295 default "0xff002008" if CPM1 296 help 297 This specifies the address of the transmit descriptor 298 used for early debug output. Because it is needed before 299 platform probing is done, all platforms selected must 300 share the same address. 301 302endmenu 303