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 depends on PPC64 122 help 123 If you say Y here the kernel will use separate kernel stacks 124 for handling hard and soft interrupts. This can help avoid 125 overflowing the process kernel stacks. 126 127config VIRQ_DEBUG 128 bool "Expose hardware/virtual IRQ mapping via debugfs" 129 depends on DEBUG_FS && PPC_MERGE 130 help 131 This option will show the mapping relationship between hardware irq 132 numbers and virtual irq numbers. The mapping is exposed via debugfs 133 in the file powerpc/virq_mapping. 134 135 If you don't know what this means you don't need it. 136 137config BDI_SWITCH 138 bool "Include BDI-2000 user context switcher" 139 depends on DEBUG_KERNEL && PPC32 140 help 141 Include in-kernel support for the Abatron BDI2000 debugger. 142 Unless you are intending to debug the kernel with one of these 143 machines, say N here. 144 145config BOOTX_TEXT 146 bool "Support for early boot text console (BootX or OpenFirmware only)" 147 depends PPC_OF && PPC_MULTIPLATFORM 148 help 149 Say Y here to see progress messages from the boot firmware in text 150 mode. Requires either BootX or Open Firmware. 151 152config PPC_EARLY_DEBUG 153 bool "Early debugging (dangerous)" 154 155choice 156 prompt "Early debugging console" 157 depends on PPC_EARLY_DEBUG 158 help 159 Use the selected console for early debugging. Careful, if you 160 enable debugging for the wrong type of machine your kernel 161 _will not boot_. 162 163config PPC_EARLY_DEBUG_LPAR 164 bool "LPAR HV Console" 165 depends on PPC_PSERIES 166 help 167 Select this to enable early debugging for a machine with a HVC 168 console on vterm 0. 169 170config PPC_EARLY_DEBUG_G5 171 bool "Apple G5" 172 depends on PPC_PMAC64 173 help 174 Select this to enable early debugging for Apple G5 machines. 175 176config PPC_EARLY_DEBUG_RTAS_PANEL 177 bool "RTAS Panel" 178 depends on PPC_RTAS 179 help 180 Select this to enable early debugging via the RTAS panel. 181 182config PPC_EARLY_DEBUG_RTAS_CONSOLE 183 bool "RTAS Console" 184 depends on PPC_RTAS 185 select UDBG_RTAS_CONSOLE 186 help 187 Select this to enable early debugging via the RTAS console. 188 189config PPC_EARLY_DEBUG_MAPLE 190 bool "Maple real mode" 191 depends on PPC_MAPLE 192 help 193 Select this to enable early debugging for Maple. 194 195config PPC_EARLY_DEBUG_ISERIES 196 bool "iSeries HV Console" 197 depends on PPC_ISERIES 198 help 199 Select this to enable early debugging for legacy iSeries. You need 200 to hit "Ctrl-x Ctrl-x" to see the messages on the console. 201 202config PPC_EARLY_DEBUG_PAS_REALMODE 203 bool "PA Semi real mode" 204 depends on PPC_PASEMI 205 help 206 Select this to enable early debugging for PA Semi. 207 Output will be on UART0. 208 209config PPC_EARLY_DEBUG_BEAT 210 bool "Beat HV Console" 211 depends on PPC_CELLEB 212 select PPC_UDBG_BEAT 213 help 214 Select this to enable early debugging for Celleb with Beat. 215 216config PPC_EARLY_DEBUG_44x 217 bool "Early serial debugging for IBM/AMCC 44x CPUs" 218 depends on 44x 219 select PPC_UDBG_16550 220 help 221 Select this to enable early debugging for IBM 44x chips via the 222 inbuilt serial port. 223 224config PPC_EARLY_DEBUG_CPM 225 bool "Early serial debugging for Freescale CPM-based serial ports" 226 depends on SERIAL_CPM 227 select PIN_TLB if PPC_8xx 228 help 229 Select this to enable early debugging for Freescale chips 230 using a CPM-based serial port. This assumes that the bootwrapper 231 has run, and set up the CPM in a particular way. 232 233endchoice 234 235config PPC_EARLY_DEBUG_44x_PHYSLOW 236 hex "Low 32 bits of early debug UART physical address" 237 depends PPC_EARLY_DEBUG_44x 238 default "0x40000200" 239 240config PPC_EARLY_DEBUG_44x_PHYSHIGH 241 hex "EPRN of early debug UART physical address" 242 depends PPC_EARLY_DEBUG_44x 243 default "0x1" 244 245config PPC_EARLY_DEBUG_CPM_ADDR 246 hex "CPM UART early debug transmit descriptor address" 247 depends on PPC_EARLY_DEBUG_CPM 248 default "0xfa202008" if PPC_EP88XC 249 default "0xf0000008" if CPM2 250 default "0xff002008" if CPM1 251 help 252 This specifies the address of the transmit descriptor 253 used for early debug output. Because it is needed before 254 platform probing is done, all platforms selected must 255 share the same address. 256 257endmenu 258