BEDBUG Support for U-Boot
  --------------------------
  
  These changes implement the bedbug (emBEDded deBUGger) debugger in U-Boot.

  A specific implementation is made for the AMCC 405 processor but other flavors

  can be easily implemented.
  
  #####################
  ### Modifications ###
  #####################
  
  ./common/Makefile
  	Included cmd_bedbug.c and bedbug.c in the Makefile.
  
  ./common/command.c
  	Added bedbug commands to command table.
  
  ./common/board.c
  	Added call to initialize debugger on startup.

  ./arch/powerpc/cpu/ppc4xx/Makefile

  	Added bedbug_405.c to the Makefile.

  ./arch/powerpc/cpu/ppc4xx/start.S

  	Added code to handle the debug exception (0x2000) on the 405.
  	Also added code to handle critical exceptions since the debug
  	is treated as critical on the 405.

  ./arch/powerpc/cpu/ppc4xx/traps.c

  	Added more detailed output for the program exception to tell
  	if it is an illegal instruction, privileged instruction or
  	a trap. Also added debug trap handler.

  ./include/ppc_asm.tmpl
  	Added code to handle critical exceptions
  
  #################
  ### New Stuff ###
  #################
  
  ./include/bedbug/ppc.h
  ./include/bedbug/regs.h
  ./include/bedbug/bedbug.h
  ./include/bedbug/elf.h		[obsoleted by new include/elf.h]
  ./include/bedbug/tables.h
  ./include/cmd_bedbug.h
  ./common/cmd_bedbug.c
  ./common/bedbug.c
  	Bedbug library includes code for assembling and disassembling
  	PowerPC instructions to/from memory as well as handling
  	hardware breakpoints and stepping through code.  These
  	routines are common to all PowerPC processors.

  ./arch/powerpc/cpu/ppc4xx/bedbug_405.c

  	AMCC  PPC405 specific debugger routines.

  Bedbug support for the MPC860
  -----------------------------
  
  Changes:
  
  	common/cmd_bedbug.c
  		Added call to initialize 860 debugger.

  	arch/powerpc/cpu/mpc8xx/Makefile

  		Added new file "bedbug_860.c" to the makefile

  	arch/powerpc/cpu/mpc8xx/start.S

  		Added handler for InstructionBreakpoint (0xfd00)

  	arch/powerpc/cpu/mpc8xx/traps.c

  		Added new routine DebugException()

  New Files:

  	arch/powerpc/cpu/mpc8xx/bedbug_860.c

  		CPU-specific routines for 860 debug registers.