menu "Kernel hacking"

  config TRACE_IRQFLAGS_SUPPORT

  	def_bool y

  source "lib/Kconfig.debug"
  
  config SH_STANDARD_BIOS
  	bool "Use LinuxSH standard BIOS"

  	depends on SUPERH32

  	help
  	  Say Y here if your target has the gdb-sh-stub
  	  package from www.m17n.org (or any conforming standard LinuxSH BIOS)
  	  in FLASH or EPROM.  The kernel will use standard BIOS calls during
  	  boot for various housekeeping tasks (including calls to read and
  	  write characters to a system console, get a MAC address from an
  	  on-board Ethernet interface, and shut down the hardware).  Note this
  	  does not work with machines with an existing operating system in
  	  mask ROM and no flash (WindowsCE machines fall in this category).
  	  If unsure, say N.
  
  config EARLY_SCIF_CONSOLE
  	bool "Use early SCIF console"

  	help
  	  This enables an early console using a fixed SCIF port. This can
  	  be used by platforms that are either not running the SH
  	  standard BIOS, or do not wish to use the BIOS callbacks for the
  	  serial I/O.
  
  config EARLY_SCIF_CONSOLE_PORT

  	hex

  	depends on EARLY_SCIF_CONSOLE

  	default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705

  	default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721

  	default "0xf8420000" if CPU_SUBTYPE_SH7619
  	default "0xff804000" if CPU_SUBTYPE_MXG

  	default "0xffc30000" if CPU_SUBTYPE_SHX3

  	default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \

  				CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
  				CPU_SUBTYPE_SH7343

  	default "0xfe4c0000" if CPU_SUBTYPE_SH7757

  	default "0xffeb0000" if CPU_SUBTYPE_SH7785

  	default "0xffeb0000" if CPU_SUBTYPE_SH7786

  	default "0xfffe8000" if CPU_SUBTYPE_SH7203
  	default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263

  	default "0xffe80000" if CPU_SH4

  	default "0xa4000150" if CPU_SH3

  	default "0x00000000"

  
  config EARLY_PRINTK
  	bool "Early printk support"
  	depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
  	help
  	  Say Y here to redirect kernel printk messages to the serial port
  	  used by the SH-IPL bootloader, starting very early in the boot
  	  process and ending when the kernel's serial console is initialised.
  	  This option is only useful porting the kernel to a new machine,
  	  when the kernel may crash or hang before the serial console is
  	  initialised. If unsure, say N.

  	  On devices that are running SH-IPL and want to keep the port
  	  initialization consistent while not using the BIOS callbacks,
  	  select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
  	  the kernel command line option to toggle back and forth.

  config STACK_DEBUG

  	bool "Check for stack overflows"

  	depends on DEBUG_KERNEL && SUPERH32

  	help
  	  This option will cause messages to be printed if free stack space

  	  drops below a certain limit. Saying Y here will add overhead to
  	  every function call and will therefore incur a major
  	  performance hit. Most users should say N.

  
  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 4KSTACKS
  	bool "Use 4Kb for kernel stacks instead of 8Kb"

  	depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB

  	help
  	  If you say Y here the kernel will use a 4Kb stacksize for the
  	  kernel stack attached to each process/thread. This facilitates
  	  running more threads on a system and also reduces the pressure
  	  on the VM subsystem for higher order allocations. This option
  	  will also use IRQ stacks to compensate for the reduced stackspace.

  config IRQSTACKS
  	bool "Use separate kernel stacks when processing interrupts"

  	depends on DEBUG_KERNEL && SUPERH32 && BROKEN

  	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 DUMP_CODE
  	bool "Show disassembly of nearby code in register dumps"
  	depends on DEBUG_KERNEL && SUPERH32
  	default y if DEBUG_BUGVERBOSE
  	default n
  	help
  	  This prints out a code trace of the instructions leading up to
  	  the faulting instruction as a debugging aid. As this does grow
  	  the kernel in size a bit, most users will want to say N here.
  
  	  Those looking for more verbose debugging output should say Y.

  config DWARF_UNWINDER
  	bool "Enable the DWARF unwinder for stacktraces"
  	select FRAME_POINTER
  	default n
  	help
  	  Enabling this option will make stacktraces more accurate, at
  	  the cost of an increase in overall kernel size.

  config SH_NO_BSS_INIT
  	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
  	depends on DEBUG_KERNEL
  	default n
  	help
  	  If running in painfully slow environments, such as an RTL
  	  simulation or from remote memory via SHdebug, where the memory
  	  can already be gauranteed to ber zeroed on boot, say Y.
  
  	  For all other cases, say N. If this option seems perplexing, or
  	  you aren't sure, say N.

  config SH64_SR_WATCH
  	bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"

  	depends on SUPERH64

  config MCOUNT
  	def_bool y
  	depends on SUPERH32
  	depends on STACK_DEBUG || FUNCTION_TRACER

  endmenu