1menu "Kernel hacking" 2 3source "lib/Kconfig.debug" 4 5config DEBUG_STACKOVERFLOW 6 bool "Check for stack overflows" 7 depends on DEBUG_KERNEL 8 help 9 This option will cause messages to be printed if free stack space 10 drops below a certain limit. 11 12config DEBUG_STACK_USAGE 13 bool "Stack utilization instrumentation" 14 depends on DEBUG_KERNEL 15 help 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. 18 19 This option will slow down process creation somewhat. 20 21config DEBUG_PAGEALLOC 22 bool "Debug page memory allocations" 23 depends on DEBUG_KERNEL && !HIBERNATION 24 help 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. 28 29 30config HCALL_STATS 31 bool "Hypervisor call instrumentation" 32 depends on PPC_PSERIES && DEBUG_FS 33 help 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. 40 41 This option will add a small amount of overhead to all hypervisor 42 calls. 43 44config DEBUGGER 45 bool "Enable debugger hooks" 46 depends on DEBUG_KERNEL 47 help 48 Include in-kernel hooks for kernel debuggers. Unless you are 49 intending to debug the kernel, say N here. 50 51config KGDB 52 bool "Include kgdb kernel debugger" 53 depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx) 54 select DEBUG_INFO 55 help 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. 59 60config CODE_PATCHING_SELFTEST 61 bool "Run self-tests of the code-patching code." 62 depends on DEBUG_KERNEL 63 default n 64 65config FTR_FIXUP_SELFTEST 66 bool "Run self-tests of the feature-fixup code." 67 depends on DEBUG_KERNEL 68 default n 69 70choice 71 prompt "Serial Port" 72 depends on KGDB 73 default KGDB_TTYS1 74 75config KGDB_TTYS0 76 bool "ttyS0" 77 78config KGDB_TTYS1 79 bool "ttyS1" 80 81config KGDB_TTYS2 82 bool "ttyS2" 83 84config KGDB_TTYS3 85 bool "ttyS3" 86 87endchoice 88 89config KGDB_CONSOLE 90 bool "Enable serial console thru kgdb port" 91 depends on KGDB && 8xx || CPM2 92 help 93 If you enable this, all serial console messages will be sent 94 over the gdb stub. 95 If unsure, say N. 96 97config XMON 98 bool "Include xmon kernel debugger" 99 depends on DEBUGGER 100 help 101 Include in-kernel hooks for the xmon kernel monitor/debugger. 102 Unless you are intending to debug the kernel, say N here. 103 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise 104 nothing will appear on the screen (xmon writes directly to the 105 framebuffer memory). 106 The cmdline option 'xmon' or 'xmon=early' will drop into xmon 107 very early during boot. 'xmon=on' will just enable the xmon 108 debugger hooks. 'xmon=off' will disable the debugger hooks 109 if CONFIG_XMON_DEFAULT is set. 110 xmon will print a backtrace on the very first invocation. 111 'xmon=nobt' will disable this autobacktrace. 112 113config XMON_DEFAULT 114 bool "Enable xmon by default" 115 depends on XMON 116 help 117 xmon is normally disabled unless booted with 'xmon=on'. 118 Use 'xmon=off' to disable xmon init during runtime. 119 120config XMON_DISASSEMBLY 121 bool "Include disassembly support in xmon" 122 depends on XMON 123 default y 124 help 125 Include support for disassembling in xmon. You probably want 126 to say Y here, unless you're building for a memory-constrained 127 system. 128 129config IRQSTACKS 130 bool "Use separate kernel stacks when processing interrupts" 131 help 132 If you say Y here the kernel will use separate kernel stacks 133 for handling hard and soft interrupts. This can help avoid 134 overflowing the process kernel stacks. 135 136config VIRQ_DEBUG 137 bool "Expose hardware/virtual IRQ mapping via debugfs" 138 depends on DEBUG_FS && PPC_MERGE 139 help 140 This option will show the mapping relationship between hardware irq 141 numbers and virtual irq numbers. The mapping is exposed via debugfs 142 in the file powerpc/virq_mapping. 143 144 If you don't know what this means you don't need it. 145 146config BDI_SWITCH 147 bool "Include BDI-2000 user context switcher" 148 depends on DEBUG_KERNEL && PPC32 149 help 150 Include in-kernel support for the Abatron BDI2000 debugger. 151 Unless you are intending to debug the kernel with one of these 152 machines, say N here. 153 154config BOOTX_TEXT 155 bool "Support for early boot text console (BootX or OpenFirmware only)" 156 depends on PPC_OF && PPC_MULTIPLATFORM 157 help 158 Say Y here to see progress messages from the boot firmware in text 159 mode. Requires either BootX or Open Firmware. 160 161config PPC_EARLY_DEBUG 162 bool "Early debugging (dangerous)" 163 # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water 164 # mark, which doesn't work with current 440 KVM. 165 depends on !KVM 166 help 167 Say Y to enable some early debugging facilities that may be available 168 for your processor/board combination. Those facilities are hacks 169 intended to debug problems early during boot, this should not be 170 enabled in a production kernel. 171 Note that enabling this will also cause the kernel default log level 172 to be pushed to max automatically very early during boot 173 174choice 175 prompt "Early debugging console" 176 depends on PPC_EARLY_DEBUG 177 help 178 Use the selected console for early debugging. Careful, if you 179 enable debugging for the wrong type of machine your kernel 180 _will not boot_. 181 182config PPC_EARLY_DEBUG_LPAR 183 bool "LPAR HV Console" 184 depends on PPC_PSERIES 185 help 186 Select this to enable early debugging for a machine with a HVC 187 console on vterm 0. 188 189config PPC_EARLY_DEBUG_G5 190 bool "Apple G5" 191 depends on PPC_PMAC64 192 help 193 Select this to enable early debugging for Apple G5 machines. 194 195config PPC_EARLY_DEBUG_RTAS_PANEL 196 bool "RTAS Panel" 197 depends on PPC_RTAS 198 help 199 Select this to enable early debugging via the RTAS panel. 200 201config PPC_EARLY_DEBUG_RTAS_CONSOLE 202 bool "RTAS Console" 203 depends on PPC_RTAS 204 select UDBG_RTAS_CONSOLE 205 help 206 Select this to enable early debugging via the RTAS console. 207 208config PPC_EARLY_DEBUG_MAPLE 209 bool "Maple real mode" 210 depends on PPC_MAPLE 211 help 212 Select this to enable early debugging for Maple. 213 214config PPC_EARLY_DEBUG_ISERIES 215 bool "iSeries HV Console" 216 depends on PPC_ISERIES 217 help 218 Select this to enable early debugging for legacy iSeries. You need 219 to hit "Ctrl-x Ctrl-x" to see the messages on the console. 220 221config PPC_EARLY_DEBUG_PAS_REALMODE 222 bool "PA Semi real mode" 223 depends on PPC_PASEMI 224 help 225 Select this to enable early debugging for PA Semi. 226 Output will be on UART0. 227 228config PPC_EARLY_DEBUG_BEAT 229 bool "Beat HV Console" 230 depends on PPC_CELLEB 231 select PPC_UDBG_BEAT 232 help 233 Select this to enable early debugging for Celleb with Beat. 234 235config PPC_EARLY_DEBUG_44x 236 bool "Early serial debugging for IBM/AMCC 44x CPUs" 237 depends on 44x 238 help 239 Select this to enable early debugging for IBM 44x chips via the 240 inbuilt serial port. If you enable this, ensure you set 241 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. 242 243config PPC_EARLY_DEBUG_40x 244 bool "Early serial debugging for IBM/AMCC 40x CPUs" 245 depends on 40x 246 help 247 Select this to enable early debugging for IBM 40x chips via the 248 inbuilt serial port. This works on chips with a 16550 compatible 249 UART. Xilinx chips with uartlite cannot use this option. 250 251config PPC_EARLY_DEBUG_CPM 252 bool "Early serial debugging for Freescale CPM-based serial ports" 253 depends on SERIAL_CPM 254 select PIN_TLB if PPC_8xx 255 help 256 Select this to enable early debugging for Freescale chips 257 using a CPM-based serial port. This assumes that the bootwrapper 258 has run, and set up the CPM in a particular way. 259 260endchoice 261 262config PPC_EARLY_DEBUG_44x_PHYSLOW 263 hex "Low 32 bits of early debug UART physical address" 264 depends on PPC_EARLY_DEBUG_44x 265 default "0x40000200" 266 help 267 You probably want 0x40000200 for ebony boards and 268 0x40000300 for taishan 269 270config PPC_EARLY_DEBUG_44x_PHYSHIGH 271 hex "EPRN of early debug UART physical address" 272 depends on PPC_EARLY_DEBUG_44x 273 default "0x1" 274 275config PPC_EARLY_DEBUG_40x_PHYSADDR 276 hex "Early debug UART physical address" 277 depends on PPC_EARLY_DEBUG_40x 278 default "0xef600300" 279 280config PPC_EARLY_DEBUG_CPM_ADDR 281 hex "CPM UART early debug transmit descriptor address" 282 depends on PPC_EARLY_DEBUG_CPM 283 default "0xfa202008" if PPC_EP88XC 284 default "0xf0001ff8" if CPM2 285 default "0xff002008" if CPM1 286 help 287 This specifies the address of the transmit descriptor 288 used for early debug output. Because it is needed before 289 platform probing is done, all platforms selected must 290 share the same address. 291 292endmenu 293