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 BDI_SWITCH 118 bool "Include BDI-2000 user context switcher" 119 depends on DEBUG_KERNEL && PPC32 120 help 121 Include in-kernel support for the Abatron BDI2000 debugger. 122 Unless you are intending to debug the kernel with one of these 123 machines, say N here. 124 125config BOOTX_TEXT 126 bool "Support for early boot text console (BootX or OpenFirmware only)" 127 depends on PPC_OF && PPC_BOOK3S 128 help 129 Say Y here to see progress messages from the boot firmware in text 130 mode. Requires either BootX or Open Firmware. 131 132config PPC_EARLY_DEBUG 133 bool "Early debugging (dangerous)" 134 help 135 Say Y to enable some early debugging facilities that may be available 136 for your processor/board combination. Those facilities are hacks 137 intended to debug problems early during boot, this should not be 138 enabled in a production kernel. 139 Note that enabling this will also cause the kernel default log level 140 to be pushed to max automatically very early during boot 141 142choice 143 prompt "Early debugging console" 144 depends on PPC_EARLY_DEBUG 145 help 146 Use the selected console for early debugging. Careful, if you 147 enable debugging for the wrong type of machine your kernel 148 _will not boot_. 149 150config PPC_EARLY_DEBUG_LPAR 151 bool "LPAR HV Console" 152 depends on PPC_PSERIES 153 help 154 Select this to enable early debugging for a machine with a HVC 155 console on vterm 0. 156 157config PPC_EARLY_DEBUG_LPAR_HVSI 158 bool "LPAR HVSI Console" 159 depends on PPC_PSERIES 160 help 161 Select this to enable early debugging for a machine with a HVSI 162 console on a specified vterm. 163 164config PPC_EARLY_DEBUG_G5 165 bool "Apple G5" 166 depends on PPC_PMAC64 167 help 168 Select this to enable early debugging for Apple G5 machines. 169 170config PPC_EARLY_DEBUG_RTAS_PANEL 171 bool "RTAS Panel" 172 depends on PPC_RTAS 173 help 174 Select this to enable early debugging via the RTAS panel. 175 176config PPC_EARLY_DEBUG_RTAS_CONSOLE 177 bool "RTAS Console" 178 depends on PPC_RTAS 179 select UDBG_RTAS_CONSOLE 180 help 181 Select this to enable early debugging via the RTAS console. 182 183config PPC_EARLY_DEBUG_MAPLE 184 bool "Maple real mode" 185 depends on PPC_MAPLE 186 help 187 Select this to enable early debugging for Maple. 188 189config PPC_EARLY_DEBUG_PAS_REALMODE 190 bool "PA Semi real mode" 191 depends on PPC_PASEMI 192 help 193 Select this to enable early debugging for PA Semi. 194 Output will be on UART0. 195 196config PPC_EARLY_DEBUG_BEAT 197 bool "Beat HV Console" 198 depends on PPC_CELLEB 199 select PPC_UDBG_BEAT 200 help 201 Select this to enable early debugging for Celleb with Beat. 202 203config PPC_EARLY_DEBUG_44x 204 bool "Early serial debugging for IBM/AMCC 44x CPUs" 205 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water 206 # mark, which doesn't work with current 440 KVM. 207 depends on 44x && !KVM 208 help 209 Select this to enable early debugging for IBM 44x chips via the 210 inbuilt serial port. If you enable this, ensure you set 211 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. 212 213config PPC_EARLY_DEBUG_40x 214 bool "Early serial debugging for IBM/AMCC 40x CPUs" 215 depends on 40x 216 help 217 Select this to enable early debugging for IBM 40x chips via the 218 inbuilt serial port. This works on chips with a 16550 compatible 219 UART. Xilinx chips with uartlite cannot use this option. 220 221config PPC_EARLY_DEBUG_CPM 222 bool "Early serial debugging for Freescale CPM-based serial ports" 223 depends on SERIAL_CPM 224 select PIN_TLB if PPC_8xx 225 help 226 Select this to enable early debugging for Freescale chips 227 using a CPM-based serial port. This assumes that the bootwrapper 228 has run, and set up the CPM in a particular way. 229 230config PPC_EARLY_DEBUG_USBGECKO 231 bool "Early debugging through the USB Gecko adapter" 232 depends on GAMECUBE_COMMON 233 select USBGECKO_UDBG 234 help 235 Select this to enable early debugging for Nintendo GameCube/Wii 236 consoles via an external USB Gecko adapter. 237 238config PPC_EARLY_DEBUG_WSP 239 bool "Early debugging via WSP's internal UART" 240 depends on PPC_WSP 241 select PPC_UDBG_16550 242 243config PPC_EARLY_DEBUG_PS3GELIC 244 bool "Early debugging through the PS3 Ethernet port" 245 depends on PPC_PS3 246 select PS3GELIC_UDBG 247 help 248 Select this to enable early debugging for the PlayStation3 via 249 UDP broadcasts sent out through the Ethernet port. 250 251config PPC_EARLY_DEBUG_OPAL_RAW 252 bool "OPAL raw console" 253 depends on HVC_OPAL 254 help 255 Select this to enable early debugging for the PowerNV platform 256 using a "raw" console 257 258config PPC_EARLY_DEBUG_OPAL_HVSI 259 bool "OPAL hvsi console" 260 depends on HVC_OPAL 261 help 262 Select this to enable early debugging for the PowerNV platform 263 using an "hvsi" console 264 265endchoice 266 267config PPC_EARLY_DEBUG_OPAL 268 def_bool y 269 depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI 270 271 272config PPC_EARLY_DEBUG_HVSI_VTERMNO 273 hex "vterm number to use with early debug HVSI" 274 depends on PPC_EARLY_DEBUG_LPAR_HVSI 275 default "0x30000000" 276 help 277 You probably want 0x30000000 for your first serial port and 278 0x30000001 for your second one 279 280config PPC_EARLY_DEBUG_OPAL_VTERMNO 281 hex "vterm number to use with OPAL early debug" 282 depends on PPC_EARLY_DEBUG_OPAL 283 default "0" 284 help 285 This correspond to which /dev/hvcN you want to use for early 286 debug. 287 288 On OPAL v1 (takeover) this should always be 0 289 On OPAL v2, this will be 0 for network console and 1 or 2 for 290 the machine built-in serial ports. 291 292config PPC_EARLY_DEBUG_44x_PHYSLOW 293 hex "Low 32 bits of early debug UART physical address" 294 depends on PPC_EARLY_DEBUG_44x 295 default "0x40000200" 296 help 297 You probably want 0x40000200 for ebony boards and 298 0x40000300 for taishan 299 300config PPC_EARLY_DEBUG_44x_PHYSHIGH 301 hex "EPRN of early debug UART physical address" 302 depends on PPC_EARLY_DEBUG_44x 303 default "0x1" 304 305config PPC_EARLY_DEBUG_40x_PHYSADDR 306 hex "Early debug UART physical address" 307 depends on PPC_EARLY_DEBUG_40x 308 default "0xef600300" 309 310config PPC_EARLY_DEBUG_CPM_ADDR 311 hex "CPM UART early debug transmit descriptor address" 312 depends on PPC_EARLY_DEBUG_CPM 313 default "0xfa202008" if PPC_EP88XC 314 default "0xf0001ff8" if CPM2 315 default "0xff002008" if CPM1 316 help 317 This specifies the address of the transmit descriptor 318 used for early debug output. Because it is needed before 319 platform probing is done, all platforms selected must 320 share the same address. 321 322config STRICT_DEVMEM 323 def_bool y 324 prompt "Filter access to /dev/mem" 325 help 326 This option restricts access to /dev/mem. If this option is 327 disabled, you allow userspace access to all memory, including 328 kernel and userspace memory. Accidental memory access is likely 329 to be disastrous. 330 Memory access is required for experts who want to debug the kernel. 331 332 If you are unsure, say Y. 333 334endmenu 335