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 HCALL_STATS 39 bool "Hypervisor call instrumentation" 40 depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS 41 help 42 Adds code to keep track of the number of hypervisor calls made and 43 the amount of time spent in hypervisor calls. Wall time spent in 44 each call is always calculated, and if available CPU cycles spent 45 are also calculated. A directory named hcall_inst is added at the 46 root of the debugfs filesystem. Within the hcall_inst directory 47 are files that contain CPU specific call statistics. 48 49 This option will add a small amount of overhead to all hypervisor 50 calls. 51 52config PPC_EMULATED_STATS 53 bool "Emulated instructions tracking" 54 depends on DEBUG_FS 55 help 56 Adds code to keep track of the number of instructions that are 57 emulated by the in-kernel emulator. Counters for the various classes 58 of emulated instructions are available under 59 powerpc/emulated_instructions/ in the root of the debugfs file 60 system. Optionally (controlled by 61 powerpc/emulated_instructions/do_warn in debugfs), rate-limited 62 warnings can be printed to the console when instructions are 63 emulated. 64 65config CODE_PATCHING_SELFTEST 66 bool "Run self-tests of the code-patching code." 67 depends on DEBUG_KERNEL 68 default n 69 70config FTR_FIXUP_SELFTEST 71 bool "Run self-tests of the feature-fixup code." 72 depends on DEBUG_KERNEL 73 default n 74 75config MSI_BITMAP_SELFTEST 76 bool "Run self-tests of the MSI bitmap code." 77 depends on DEBUG_KERNEL 78 default n 79 80config XMON 81 bool "Include xmon kernel debugger" 82 depends on DEBUG_KERNEL 83 help 84 Include in-kernel hooks for the xmon kernel monitor/debugger. 85 Unless you are intending to debug the kernel, say N here. 86 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise 87 nothing will appear on the screen (xmon writes directly to the 88 framebuffer memory). 89 The cmdline option 'xmon' or 'xmon=early' will drop into xmon 90 very early during boot. 'xmon=on' will just enable the xmon 91 debugger hooks. 'xmon=off' will disable the debugger hooks 92 if CONFIG_XMON_DEFAULT is set. 93 xmon will print a backtrace on the very first invocation. 94 'xmon=nobt' will disable this autobacktrace. 95 96config XMON_DEFAULT 97 bool "Enable xmon by default" 98 depends on XMON 99 help 100 xmon is normally disabled unless booted with 'xmon=on'. 101 Use 'xmon=off' to disable xmon init during runtime. 102 103config XMON_DISASSEMBLY 104 bool "Include disassembly support in xmon" 105 depends on XMON 106 default y 107 help 108 Include support for disassembling in xmon. You probably want 109 to say Y here, unless you're building for a memory-constrained 110 system. 111 112config DEBUGGER 113 bool 114 depends on KGDB || XMON 115 default y 116 117config VIRQ_DEBUG 118 bool "Expose hardware/virtual IRQ mapping via debugfs" 119 depends on DEBUG_FS 120 help 121 This option will show the mapping relationship between hardware irq 122 numbers and virtual irq numbers. The mapping is exposed via debugfs 123 in the file powerpc/virq_mapping. 124 125 If you don't know what this means you don't need it. 126 127config BDI_SWITCH 128 bool "Include BDI-2000 user context switcher" 129 depends on DEBUG_KERNEL && PPC32 130 help 131 Include in-kernel support for the Abatron BDI2000 debugger. 132 Unless you are intending to debug the kernel with one of these 133 machines, say N here. 134 135config BOOTX_TEXT 136 bool "Support for early boot text console (BootX or OpenFirmware only)" 137 depends on PPC_OF && PPC_BOOK3S 138 help 139 Say Y here to see progress messages from the boot firmware in text 140 mode. Requires either BootX or Open Firmware. 141 142config PPC_EARLY_DEBUG 143 bool "Early debugging (dangerous)" 144 help 145 Say Y to enable some early debugging facilities that may be available 146 for your processor/board combination. Those facilities are hacks 147 intended to debug problems early during boot, this should not be 148 enabled in a production kernel. 149 Note that enabling this will also cause the kernel default log level 150 to be pushed to max automatically very early during boot 151 152choice 153 prompt "Early debugging console" 154 depends on PPC_EARLY_DEBUG 155 help 156 Use the selected console for early debugging. Careful, if you 157 enable debugging for the wrong type of machine your kernel 158 _will not boot_. 159 160config PPC_EARLY_DEBUG_LPAR 161 bool "LPAR HV Console" 162 depends on PPC_PSERIES 163 help 164 Select this to enable early debugging for a machine with a HVC 165 console on vterm 0. 166 167config PPC_EARLY_DEBUG_LPAR_HVSI 168 bool "LPAR HVSI Console" 169 depends on PPC_PSERIES 170 help 171 Select this to enable early debugging for a machine with a HVSI 172 console on a specified vterm. 173 174config PPC_EARLY_DEBUG_G5 175 bool "Apple G5" 176 depends on PPC_PMAC64 177 help 178 Select this to enable early debugging for Apple G5 machines. 179 180config PPC_EARLY_DEBUG_RTAS_PANEL 181 bool "RTAS Panel" 182 depends on PPC_RTAS 183 help 184 Select this to enable early debugging via the RTAS panel. 185 186config PPC_EARLY_DEBUG_RTAS_CONSOLE 187 bool "RTAS Console" 188 depends on PPC_RTAS 189 select UDBG_RTAS_CONSOLE 190 help 191 Select this to enable early debugging via the RTAS console. 192 193config PPC_EARLY_DEBUG_MAPLE 194 bool "Maple real mode" 195 depends on PPC_MAPLE 196 help 197 Select this to enable early debugging for Maple. 198 199config PPC_EARLY_DEBUG_PAS_REALMODE 200 bool "PA Semi real mode" 201 depends on PPC_PASEMI 202 help 203 Select this to enable early debugging for PA Semi. 204 Output will be on UART0. 205 206config PPC_EARLY_DEBUG_BEAT 207 bool "Beat HV Console" 208 depends on PPC_CELLEB 209 select PPC_UDBG_BEAT 210 help 211 Select this to enable early debugging for Celleb with Beat. 212 213config PPC_EARLY_DEBUG_44x 214 bool "Early serial debugging for IBM/AMCC 44x CPUs" 215 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water 216 # mark, which doesn't work with current 440 KVM. 217 depends on 44x && !KVM 218 help 219 Select this to enable early debugging for IBM 44x chips via the 220 inbuilt serial port. If you enable this, ensure you set 221 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. 222 223config PPC_EARLY_DEBUG_40x 224 bool "Early serial debugging for IBM/AMCC 40x CPUs" 225 depends on 40x 226 help 227 Select this to enable early debugging for IBM 40x chips via the 228 inbuilt serial port. This works on chips with a 16550 compatible 229 UART. Xilinx chips with uartlite cannot use this option. 230 231config PPC_EARLY_DEBUG_CPM 232 bool "Early serial debugging for Freescale CPM-based serial ports" 233 depends on SERIAL_CPM 234 select PIN_TLB if PPC_8xx 235 help 236 Select this to enable early debugging for Freescale chips 237 using a CPM-based serial port. This assumes that the bootwrapper 238 has run, and set up the CPM in a particular way. 239 240config PPC_EARLY_DEBUG_USBGECKO 241 bool "Early debugging through the USB Gecko adapter" 242 depends on GAMECUBE_COMMON 243 select USBGECKO_UDBG 244 help 245 Select this to enable early debugging for Nintendo GameCube/Wii 246 consoles via an external USB Gecko adapter. 247 248config PPC_EARLY_DEBUG_WSP 249 bool "Early debugging via WSP's internal UART" 250 depends on PPC_WSP 251 select PPC_UDBG_16550 252 253config PPC_EARLY_DEBUG_PS3GELIC 254 bool "Early debugging through the PS3 Ethernet port" 255 depends on PPC_PS3 256 select PS3GELIC_UDBG 257 help 258 Select this to enable early debugging for the PlayStation3 via 259 UDP broadcasts sent out through the Ethernet port. 260 261config PPC_EARLY_DEBUG_OPAL_RAW 262 bool "OPAL raw console" 263 depends on HVC_OPAL 264 help 265 Select this to enable early debugging for the PowerNV platform 266 using a "raw" console 267 268config PPC_EARLY_DEBUG_OPAL_HVSI 269 bool "OPAL hvsi console" 270 depends on HVC_OPAL 271 help 272 Select this to enable early debugging for the PowerNV platform 273 using an "hvsi" console 274 275endchoice 276 277config PPC_EARLY_DEBUG_OPAL 278 def_bool y 279 depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI 280 281 282config PPC_EARLY_DEBUG_HVSI_VTERMNO 283 hex "vterm number to use with early debug HVSI" 284 depends on PPC_EARLY_DEBUG_LPAR_HVSI 285 default "0x30000000" 286 help 287 You probably want 0x30000000 for your first serial port and 288 0x30000001 for your second one 289 290config PPC_EARLY_DEBUG_OPAL_VTERMNO 291 hex "vterm number to use with OPAL early debug" 292 depends on PPC_EARLY_DEBUG_OPAL 293 default "0" 294 help 295 This correspond to which /dev/hvcN you want to use for early 296 debug. 297 298 On OPAL v1 (takeover) this should always be 0 299 On OPAL v2, this will be 0 for network console and 1 or 2 for 300 the machine built-in serial ports. 301 302config PPC_EARLY_DEBUG_44x_PHYSLOW 303 hex "Low 32 bits of early debug UART physical address" 304 depends on PPC_EARLY_DEBUG_44x 305 default "0x40000200" 306 help 307 You probably want 0x40000200 for ebony boards and 308 0x40000300 for taishan 309 310config PPC_EARLY_DEBUG_44x_PHYSHIGH 311 hex "EPRN of early debug UART physical address" 312 depends on PPC_EARLY_DEBUG_44x 313 default "0x1" 314 315config PPC_EARLY_DEBUG_40x_PHYSADDR 316 hex "Early debug UART physical address" 317 depends on PPC_EARLY_DEBUG_40x 318 default "0xef600300" 319 320config PPC_EARLY_DEBUG_CPM_ADDR 321 hex "CPM UART early debug transmit descriptor address" 322 depends on PPC_EARLY_DEBUG_CPM 323 default "0xfa202008" if PPC_EP88XC 324 default "0xf0001ff8" if CPM2 325 default "0xff002008" if CPM1 326 help 327 This specifies the address of the transmit descriptor 328 used for early debug output. Because it is needed before 329 platform probing is done, all platforms selected must 330 share the same address. 331 332config STRICT_DEVMEM 333 def_bool y 334 prompt "Filter access to /dev/mem" 335 help 336 This option restricts access to /dev/mem. If this option is 337 disabled, you allow userspace access to all memory, including 338 kernel and userspace memory. Accidental memory access is likely 339 to be disastrous. 340 Memory access is required for experts who want to debug the kernel. 341 342 If you are unsure, say Y. 343 344endmenu 345