menu "Kernel hacking"
  
  source "lib/Kconfig.debug"

  config STRICT_DEVMEM
  	bool "Filter access to /dev/mem"
  	depends on MMU
  	---help---
  	  If this option is disabled, you allow userspace (root) access to all
  	  of memory, including kernel and userspace memory. Accidental
  	  access to this is obviously disastrous, but specific access can
  	  be used by people debugging the kernel.
  
  	  If this option is switched on, the /dev/mem file only allows
  	  userspace access to memory mapped peripherals.
  
            If in doubt, say Y.

  # RMK wants arm kernels compiled with frame pointers or stack unwinding.

  # If you know what you are doing and are willing to live without stack
  # traces, you can get a slightly smaller kernel by setting this option to
  # n, but then RMK will have to kill you ;).
  config FRAME_POINTER
  	bool

  	depends on !THUMB2_KERNEL

  	default y if !ARM_UNWIND

  	help
  	  If you say N here, the resulting kernel will be slightly smaller and

  	  faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
  	  when a problem occurs with the kernel, the information that is
  	  reported is severely limited.
  
  config ARM_UNWIND
  	bool "Enable stack unwinding support"
  	depends on AEABI && EXPERIMENTAL
  	default y
  	help
  	  This option enables stack unwinding support in the kernel
  	  using the information automatically generated by the
  	  compiler. The resulting kernel image is slightly bigger but
  	  the performance is not affected. Currently, this feature
  	  only works with EABI compilers. If unsure say Y.

  config OLD_MCOUNT
  	bool
  	depends on FUNCTION_TRACER && FRAME_POINTER
  	default y

  config DEBUG_USER
  	bool "Verbose user fault messages"
  	help
  	  When a user program crashes due to an exception, the kernel can
  	  print a brief message explaining what the problem was. This is
  	  sometimes helpful for debugging but serves no purpose on a
  	  production system. Most people should say N here.
  
  	  In addition, you need to pass user_debug=N on the kernel command
  	  line to enable this feature.  N consists of the sum of:
  
  	      1 - undefined instruction events
  	      2 - system calls
  	      4 - invalid data aborts
  	      8 - SIGSEGV faults
  	     16 - SIGBUS faults

  config DEBUG_ERRORS
  	bool "Verbose kernel error messages"
  	depends on DEBUG_KERNEL
  	help
  	  This option controls verbose debugging information which can be
  	  printed when the kernel detects an internal error. This debugging
  	  information is useful to kernel hackers when tracking down problems,
  	  but mostly meaningless to other people. It's safe to say Y unless
  	  you are concerned with the code size or don't want to see these
  	  messages.

  config DEBUG_STACK_USAGE
  	bool "Enable 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 output.

  
  # These options are only for real kernel hackers who want to get their hands dirty.
  config DEBUG_LL
  	bool "Kernel low-level debugging functions"
  	depends on DEBUG_KERNEL
  	help

  	  Say Y here to include definitions of printascii, printch, printhex

  	  in the kernel.  This is helpful if you are debugging code that
  	  executes before the console is initialized.

  config EARLY_PRINTK
  	bool "Early printk"
  	depends on DEBUG_LL
  	help
  	  Say Y here if you want to have an early console using the
  	  kernel low-level debugging functions. Add earlyprintk to your
  	  kernel parameters to enable this console.

  config DEBUG_ICEDCC
  	bool "Kernel low-level debugging via EmbeddedICE DCC channel"
  	depends on DEBUG_LL
  	help
  	  Say Y here if you want the debug print routines to direct their
  	  output to the EmbeddedICE macrocell's DCC channel using
  	  co-processor 14. This is known to work on the ARM9 style ICE

  	  channel and on the XScale with the PEEDI.

  
  	  It does include a timeout to ensure that the system does not
  	  totally freeze when there is nothing connected to read.

  config OC_ETM
  	bool "On-chip ETM and ETB"
  	select ARM_AMBA
  	help
  	  Enables the on-chip embedded trace macrocell and embedded trace
  	  buffer driver that will allow you to collect traces of the
  	  kernel code.

  config DEBUG_DC21285_PORT
  	bool "Kernel low-level debugging messages via footbridge serial port"
  	depends on DEBUG_LL && FOOTBRIDGE
  	help
  	  Say Y here if you want the debug print routines to direct their
  	  output to the serial port in the DC21285 (Footbridge). Saying N
  	  will cause the debug messages to appear on the first 16550
  	  serial port.
  
  config DEBUG_CLPS711X_UART2
  	bool "Kernel low-level debugging messages via UART2"
  	depends on DEBUG_LL && ARCH_CLPS711X
  	help
  	  Say Y here if you want the debug print routines to direct their
  	  output to the second serial port on these devices.  Saying N will
  	  cause the debug messages to appear on the first serial port.

  config DEBUG_S3C_UART

  	depends on PLAT_SAMSUNG

  	int "S3C UART to use for low-level debug"

  	default "0"
  	help

  	  Choice for UART for kernel low-level using S3C UARTS,

  	  should be between zero and two. The port must have been

  	  initialised by the boot-loader before use.

  
  	  The uncompressor code port configuration is now handled

  	  by CONFIG_S3C_LOWLEVEL_UART_PORT.

  
  endmenu