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 HCALL_STATS 22 bool "Hypervisor call instrumentation" 23 depends on PPC_PSERIES && DEBUG_FS 24 help 25 Adds code to keep track of the number of hypervisor calls made and 26 the amount of time spent in hypervisor callsr. Wall time spent in 27 each call is always calculated, and if available CPU cycles spent 28 are also calculated. A directory named hcall_inst is added at the 29 root of the debugfs filesystem. Within the hcall_inst directory 30 are files that contain CPU specific call statistics. 31 32 This option will add a small amount of overhead to all hypervisor 33 calls. 34 35config DEBUGGER 36 bool "Enable debugger hooks" 37 depends on DEBUG_KERNEL 38 help 39 Include in-kernel hooks for kernel debuggers. Unless you are 40 intending to debug the kernel, say N here. 41 42config KGDB 43 bool "Include kgdb kernel debugger" 44 depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx) 45 select DEBUG_INFO 46 help 47 Include in-kernel hooks for kgdb, the Linux kernel source level 48 debugger. See <http://kgdb.sourceforge.net/> for more information. 49 Unless you are intending to debug the kernel, say N here. 50 51choice 52 prompt "Serial Port" 53 depends on KGDB 54 default KGDB_TTYS1 55 56config KGDB_TTYS0 57 bool "ttyS0" 58 59config KGDB_TTYS1 60 bool "ttyS1" 61 62config KGDB_TTYS2 63 bool "ttyS2" 64 65config KGDB_TTYS3 66 bool "ttyS3" 67 68endchoice 69 70config KGDB_CONSOLE 71 bool "Enable serial console thru kgdb port" 72 depends on KGDB && 8xx || CPM2 73 help 74 If you enable this, all serial console messages will be sent 75 over the gdb stub. 76 If unsure, say N. 77 78config XMON 79 bool "Include xmon kernel debugger" 80 depends on DEBUGGER 81 help 82 Include in-kernel hooks for the xmon kernel monitor/debugger. 83 Unless you are intending to debug the kernel, say N here. 84 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise 85 nothing will appear on the screen (xmon writes directly to the 86 framebuffer memory). 87 The cmdline option 'xmon' or 'xmon=early' will drop into xmon 88 very early during boot. 'xmon=on' will just enable the xmon 89 debugger hooks. 'xmon=off' will disable the debugger hooks 90 if CONFIG_XMON_DEFAULT is set. 91 xmon will print a backtrace on the very first invocation. 92 'xmon=nobt' will disable this autobacktrace. 93 94config XMON_DEFAULT 95 bool "Enable xmon by default" 96 depends on XMON 97 help 98 xmon is normally disabled unless booted with 'xmon=on'. 99 Use 'xmon=off' to disable xmon init during runtime. 100 101config XMON_DISASSEMBLY 102 bool "Include disassembly support in xmon" 103 depends on XMON 104 default y 105 help 106 Include support for disassembling in xmon. You probably want 107 to say Y here, unless you're building for a memory-constrained 108 system. 109 110config IRQSTACKS 111 bool "Use separate kernel stacks when processing interrupts" 112 depends on PPC64 113 help 114 If you say Y here the kernel will use separate kernel stacks 115 for handling hard and soft interrupts. This can help avoid 116 overflowing the process kernel stacks. 117 118config BDI_SWITCH 119 bool "Include BDI-2000 user context switcher" 120 depends on DEBUG_KERNEL && PPC32 121 help 122 Include in-kernel support for the Abatron BDI2000 debugger. 123 Unless you are intending to debug the kernel with one of these 124 machines, say N here. 125 126config BOOTX_TEXT 127 bool "Support for early boot text console (BootX or OpenFirmware only)" 128 depends PPC_OF 129 help 130 Say Y here to see progress messages from the boot firmware in text 131 mode. Requires either BootX or Open Firmware. 132 133config SERIAL_TEXT_DEBUG 134 bool "Support for early boot texts over serial port" 135 depends on 4xx || LOPEC || MV64X60 || PPLUS || PRPMC800 || \ 136 PPC_GEN550 || PPC_MPC52xx 137 138config PPC_EARLY_DEBUG 139 bool "Early debugging (dangerous)" 140 141choice 142 prompt "Early debugging console" 143 depends on PPC_EARLY_DEBUG 144 help 145 Use the selected console for early debugging. Careful, if you 146 enable debugging for the wrong type of machine your kernel 147 _will not boot_. 148 149config PPC_EARLY_DEBUG_LPAR 150 bool "LPAR HV Console" 151 depends on PPC_PSERIES 152 help 153 Select this to enable early debugging for a machine with a HVC 154 console on vterm 0. 155 156config PPC_EARLY_DEBUG_G5 157 bool "Apple G5" 158 depends on PPC_PMAC64 159 help 160 Select this to enable early debugging for Apple G5 machines. 161 162config PPC_EARLY_DEBUG_RTAS_PANEL 163 bool "RTAS Panel" 164 depends on PPC_RTAS 165 help 166 Select this to enable early debugging via the RTAS panel. 167 168config PPC_EARLY_DEBUG_RTAS_CONSOLE 169 bool "RTAS Console" 170 depends on PPC_RTAS 171 select UDBG_RTAS_CONSOLE 172 help 173 Select this to enable early debugging via the RTAS console. 174 175config PPC_EARLY_DEBUG_MAPLE 176 bool "Maple real mode" 177 depends on PPC_MAPLE 178 help 179 Select this to enable early debugging for Maple. 180 181config PPC_EARLY_DEBUG_ISERIES 182 bool "iSeries HV Console" 183 depends on PPC_ISERIES 184 help 185 Select this to enable early debugging for legacy iSeries. You need 186 to hit "Ctrl-x Ctrl-x" to see the messages on the console. 187 188config PPC_EARLY_DEBUG_PAS_REALMODE 189 bool "PA Semi real mode" 190 depends on PPC_PASEMI 191 help 192 Select this to enable early debugging for PA Semi. 193 Output will be on UART0. 194 195config PPC_EARLY_DEBUG_BEAT 196 bool "Beat HV Console" 197 depends on PPC_CELLEB 198 select PPC_UDBG_BEAT 199 help 200 Select this to enable early debugging for Celleb with Beat. 201 202endchoice 203 204endmenu 205