wr
==

::

   NAME
     wr - write memory

   SYNOPSIS
     wr [-u|-k|-p] [-8|-16|-32|-64] [address|symbol] value

   DESCRIPTION
     This command modifies the contents of memory.  The starting address may be
     entered either symbolically or by address.  The default modification size 
     is the size of a long data type.  Write permission must exist on the
     /dev/mem.  When writing to memory on a live system, this command should 
     obviously be used with great care.

          -u  address argument is a user virtual address.
          -k  address argument is a kernel virtual address.
          -p  address argument is a physical address.
          -8  write data in an 8-bit value.
         -16  write data in a 16-bit value.
         -32  write data in a 32-bit values (default on 32-bit machines).
         -64  write data in a 64-bit values (default on 64-bit machines).
     address  address to write.  The address is considered virtual unless the
              -p option is used.  If a virtual address is specified, the
              -u or -k options are necessary only if the address space cannot
              be determined from the address value itself.  If a user virtual
              address is specified, the address space of the current context
              implied.  The address must be expressed in hexadecimal format.
      symbol  symbol of starting address to write.
       value  the value of the data to write.

   EXAMPLES
     Turn on a debug flag:

       crash> wr my_debug_flag 1