menu "Kernel hacking" source "lib/Kconfig.debug" config DEBUG_STACKOVERFLOW bool "Check for stack overflows" depends on DEBUG_KERNEL && PPC64 help This option will cause messages to be printed if free stack space drops below a certain limit. config DEBUG_STACK_USAGE bool "Stack utilization instrumentation" depends on DEBUG_KERNEL && PPC64 help Enables the display of the minimum amount of free stack which each task has ever had available in the sysrq-T and sysrq-P debug output. This option will slow down process creation somewhat. config HCALL_STATS bool "Hypervisor call instrumentation" depends on PPC_PSERIES && DEBUG_FS help Adds code to keep track of the number of hypervisor calls made and the amount of time spent in hypervisor callsr. Wall time spent in each call is always calculated, and if available CPU cycles spent are also calculated. A directory named hcall_inst is added at the root of the debugfs filesystem. Within the hcall_inst directory are files that contain CPU specific call statistics. This option will add a small amount of overhead to all hypervisor calls. config DEBUGGER bool "Enable debugger hooks" depends on DEBUG_KERNEL help Include in-kernel hooks for kernel debuggers. Unless you are intending to debug the kernel, say N here. config KGDB bool "Include kgdb kernel debugger" depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx) select DEBUG_INFO help Include in-kernel hooks for kgdb, the Linux kernel source level debugger. See <http://kgdb.sourceforge.net/> for more information. Unless you are intending to debug the kernel, say N here. choice prompt "Serial Port" depends on KGDB default KGDB_TTYS1 config KGDB_TTYS0 bool "ttyS0" config KGDB_TTYS1 bool "ttyS1" config KGDB_TTYS2 bool "ttyS2" config KGDB_TTYS3 bool "ttyS3" endchoice config KGDB_CONSOLE bool "Enable serial console thru kgdb port" depends on KGDB && 8xx || CPM2 help If you enable this, all serial console messages will be sent over the gdb stub. If unsure, say N. config XMON bool "Include xmon kernel debugger" depends on DEBUGGER && !PPC_ISERIES help Include in-kernel hooks for the xmon kernel monitor/debugger. Unless you are intending to debug the kernel, say N here. Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise nothing will appear on the screen (xmon writes directly to the framebuffer memory). The cmdline option 'xmon' or 'xmon=early' will drop into xmon very early during boot. 'xmon=on' will just enable the xmon debugger hooks. 'xmon=off' will disable the debugger hooks if CONFIG_XMON_DEFAULT is set. xmon will print a backtrace on the very first invocation. 'xmon=nobt' will disable this autobacktrace. config XMON_DEFAULT bool "Enable xmon by default" depends on XMON help xmon is normally disabled unless booted with 'xmon=on'. Use 'xmon=off' to disable xmon init during runtime. config IRQSTACKS bool "Use separate kernel stacks when processing interrupts" depends on PPC64 help If you say Y here the kernel will use separate kernel stacks for handling hard and soft interrupts. This can help avoid overflowing the process kernel stacks. config BDI_SWITCH bool "Include BDI-2000 user context switcher" depends on DEBUG_KERNEL && PPC32 help Include in-kernel support for the Abatron BDI2000 debugger. Unless you are intending to debug the kernel with one of these machines, say N here. config BOOTX_TEXT bool "Support for early boot text console (BootX or OpenFirmware only)" depends PPC_OF && !PPC_ISERIES help Say Y here to see progress messages from the boot firmware in text mode. Requires either BootX or Open Firmware. config SERIAL_TEXT_DEBUG bool "Support for early boot texts over serial port" depends on 4xx || LOPEC || MV64X60 || PPLUS || PRPMC800 || \ PPC_GEN550 || PPC_MPC52xx config PPC_EARLY_DEBUG bool "Early debugging (dangerous)" choice prompt "Early debugging console" depends on PPC_EARLY_DEBUG help Use the selected console for early debugging. Careful, if you enable debugging for the wrong type of machine your kernel _will not boot_. config PPC_EARLY_DEBUG_LPAR bool "LPAR HV Console" depends on PPC_PSERIES help Select this to enable early debugging for a machine with a HVC console on vterm 0. config PPC_EARLY_DEBUG_G5 bool "Apple G5" depends on PPC_PMAC64 help Select this to enable early debugging for Apple G5 machines. config PPC_EARLY_DEBUG_RTAS_PANEL bool "RTAS Panel" depends on PPC_RTAS help Select this to enable early debugging via the RTAS panel. config PPC_EARLY_DEBUG_RTAS_CONSOLE bool "RTAS Console" depends on PPC_RTAS select UDBG_RTAS_CONSOLE help Select this to enable early debugging via the RTAS console. config PPC_EARLY_DEBUG_MAPLE bool "Maple real mode" depends on PPC_MAPLE help Select this to enable early debugging for Maple. config PPC_EARLY_DEBUG_ISERIES bool "iSeries HV Console" depends on PPC_ISERIES help Select this to enable early debugging for legacy iSeries. You need to hit "Ctrl-x Ctrl-x" to see the messages on the console. endchoice endmenu