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 60choice 61 prompt "Serial Port" 62 depends on KGDB 63 default KGDB_TTYS1 64 65config KGDB_TTYS0 66 bool "ttyS0" 67 68config KGDB_TTYS1 69 bool "ttyS1" 70 71config KGDB_TTYS2 72 bool "ttyS2" 73 74config KGDB_TTYS3 75 bool "ttyS3" 76 77endchoice 78 79config KGDB_CONSOLE 80 bool "Enable serial console thru kgdb port" 81 depends on KGDB && 8xx || CPM2 82 help 83 If you enable this, all serial console messages will be sent 84 over the gdb stub. 85 If unsure, say N. 86 87config XMON 88 bool "Include xmon kernel debugger" 89 depends on DEBUGGER 90 help 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 95 framebuffer memory). 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. 102 103config XMON_DEFAULT 104 bool "Enable xmon by default" 105 depends on XMON 106 help 107 xmon is normally disabled unless booted with 'xmon=on'. 108 Use 'xmon=off' to disable xmon init during runtime. 109 110config XMON_DISASSEMBLY 111 bool "Include disassembly support in xmon" 112 depends on XMON 113 default y 114 help 115 Include support for disassembling in xmon. You probably want 116 to say Y here, unless you're building for a memory-constrained 117 system. 118 119config IRQSTACKS 120 bool "Use separate kernel stacks when processing interrupts" 121 help 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. 125 126config VIRQ_DEBUG 127 bool "Expose hardware/virtual IRQ mapping via debugfs" 128 depends on DEBUG_FS && PPC_MERGE 129 help 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. 133 134 If you don't know what this means you don't need it. 135 136config BDI_SWITCH 137 bool "Include BDI-2000 user context switcher" 138 depends on DEBUG_KERNEL && PPC32 139 help 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. 143 144config BOOTX_TEXT 145 bool "Support for early boot text console (BootX or OpenFirmware only)" 146 depends on PPC_OF && PPC_MULTIPLATFORM 147 help 148 Say Y here to see progress messages from the boot firmware in text 149 mode. Requires either BootX or Open Firmware. 150 151config 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. 155 depends on !KVM 156 help 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 163 164choice 165 prompt "Early debugging console" 166 depends on PPC_EARLY_DEBUG 167 help 168 Use the selected console for early debugging. Careful, if you 169 enable debugging for the wrong type of machine your kernel 170 _will not boot_. 171 172config PPC_EARLY_DEBUG_LPAR 173 bool "LPAR HV Console" 174 depends on PPC_PSERIES 175 help 176 Select this to enable early debugging for a machine with a HVC 177 console on vterm 0. 178 179config PPC_EARLY_DEBUG_G5 180 bool "Apple G5" 181 depends on PPC_PMAC64 182 help 183 Select this to enable early debugging for Apple G5 machines. 184 185config PPC_EARLY_DEBUG_RTAS_PANEL 186 bool "RTAS Panel" 187 depends on PPC_RTAS 188 help 189 Select this to enable early debugging via the RTAS panel. 190 191config PPC_EARLY_DEBUG_RTAS_CONSOLE 192 bool "RTAS Console" 193 depends on PPC_RTAS 194 select UDBG_RTAS_CONSOLE 195 help 196 Select this to enable early debugging via the RTAS console. 197 198config PPC_EARLY_DEBUG_MAPLE 199 bool "Maple real mode" 200 depends on PPC_MAPLE 201 help 202 Select this to enable early debugging for Maple. 203 204config PPC_EARLY_DEBUG_ISERIES 205 bool "iSeries HV Console" 206 depends on PPC_ISERIES 207 help 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. 210 211config PPC_EARLY_DEBUG_PAS_REALMODE 212 bool "PA Semi real mode" 213 depends on PPC_PASEMI 214 help 215 Select this to enable early debugging for PA Semi. 216 Output will be on UART0. 217 218config PPC_EARLY_DEBUG_BEAT 219 bool "Beat HV Console" 220 depends on PPC_CELLEB 221 select PPC_UDBG_BEAT 222 help 223 Select this to enable early debugging for Celleb with Beat. 224 225config PPC_EARLY_DEBUG_44x 226 bool "Early serial debugging for IBM/AMCC 44x CPUs" 227 depends on 44x 228 help 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. 232 233config PPC_EARLY_DEBUG_40x 234 bool "Early serial debugging for IBM/AMCC 40x CPUs" 235 depends on 40x 236 help 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. 240 241config 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 245 help 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. 249 250endchoice 251 252config PPC_EARLY_DEBUG_44x_PHYSLOW 253 hex "Low 32 bits of early debug UART physical address" 254 depends on PPC_EARLY_DEBUG_44x 255 default "0x40000200" 256 help 257 You probably want 0x40000200 for ebony boards and 258 0x40000300 for taishan 259 260config PPC_EARLY_DEBUG_44x_PHYSHIGH 261 hex "EPRN of early debug UART physical address" 262 depends on PPC_EARLY_DEBUG_44x 263 default "0x1" 264 265config PPC_EARLY_DEBUG_40x_PHYSADDR 266 hex "Early debug UART physical address" 267 depends on PPC_EARLY_DEBUG_40x 268 default "0xef600300" 269 270config 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 276 help 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. 281 282endmenu 283