Kconfig.debug 6.3 KB
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menu "Kernel hacking"

source "lib/Kconfig.debug"

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config DEBUG_STACKOVERFLOW
	bool "Check for stack overflows"
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	depends on DEBUG_KERNEL
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	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"
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	depends on DEBUG_KERNEL
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	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.

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config DEBUG_PAGEALLOC
        bool "Debug page memory allocations"
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        depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND
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        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.


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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
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	  the amount of time spent in hypervisor calls.  Wall time spent in
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	  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.

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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.

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config KGDB
	bool "Include kgdb kernel debugger"
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	depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx)
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	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"
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	depends on DEBUGGER
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	help
	  Include in-kernel hooks for the xmon kernel monitor/debugger.
	  Unless you are intending to debug the kernel, say N here.
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	  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.
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	  xmon will print a backtrace on the very first invocation.
	  'xmon=nobt' will disable this autobacktrace.
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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.

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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.

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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.
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config BDI_SWITCH
	bool "Include BDI-2000 user context switcher"
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	depends on DEBUG_KERNEL && PPC32
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	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)"
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	depends PPC_OF && PPC_MULTIPLATFORM
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	help
	  Say Y here to see progress messages from the boot firmware in text
	  mode. Requires either BootX or Open Firmware.

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config PPC_EARLY_DEBUG
	bool "Early debugging (dangerous)"

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choice
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	prompt "Early debugging console"
	depends on PPC_EARLY_DEBUG
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	help
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	  Use the selected console for early debugging. Careful, if you
	  enable debugging for the wrong type of machine your kernel
	  _will not boot_.
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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.

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config PPC_EARLY_DEBUG_RTAS_PANEL
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	bool "RTAS Panel"
	depends on PPC_RTAS
	help
	  Select this to enable early debugging via the RTAS panel.

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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.

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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.

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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.

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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.

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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.

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endchoice

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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"

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endmenu