| menu "Kernel hacking" | |
| source "lib/Kconfig.debug" | |
| config DEBUG_STACKOVERFLOW | |
| bool "Check for stack overflows" | |
| depends on DEBUG_KERNEL | |
| 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 | |
| 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 DEBUG_PAGEALLOC | |
| bool "Debug page memory allocations" | |
| depends on DEBUG_KERNEL && !HIBERNATION | |
| help | |
| Unmap pages from the kernel linear mapping after free_pages(). | |
| This results in a large slowdown, but helps to find certain types | |
| of memory corruptions. | |
| 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 calls. 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 | |
| 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 XMON_DISASSEMBLY | |
| bool "Include disassembly support in xmon" | |
| depends on XMON | |
| default y | |
| help | |
| Include support for disassembling in xmon. You probably want | |
| to say Y here, unless you're building for a memory-constrained | |
| system. | |
| 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_MULTIPLATFORM | |
| help | |
| Say Y here to see progress messages from the boot firmware in text | |
| mode. Requires either BootX or Open Firmware. | |
| 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. | |
| config PPC_EARLY_DEBUG_PAS_REALMODE | |
| bool "PA Semi real mode" | |
| depends on PPC_PASEMI | |
| help | |
| Select this to enable early debugging for PA Semi. | |
| Output will be on UART0. | |
| config PPC_EARLY_DEBUG_BEAT | |
| bool "Beat HV Console" | |
| depends on PPC_CELLEB | |
| select PPC_UDBG_BEAT | |
| help | |
| Select this to enable early debugging for Celleb with Beat. | |
| config PPC_EARLY_DEBUG_44x | |
| bool "Early serial debugging for IBM/AMCC 44x CPUs" | |
| depends on 44x | |
| select PPC_UDBG_16550 | |
| help | |
| Select this to enable early debugging for IBM 44x chips via the | |
| inbuilt serial port. | |
| endchoice | |
| config PPC_EARLY_DEBUG_44x_PHYSLOW | |
| hex "Low 32 bits of early debug UART physical address" | |
| depends PPC_EARLY_DEBUG_44x | |
| default "0x40000200" | |
| config PPC_EARLY_DEBUG_44x_PHYSHIGH | |
| hex "EPRN of early debug UART physical address" | |
| depends PPC_EARLY_DEBUG_44x | |
| default "0x1" | |
| endmenu |