This allos to write and read variable while loading rt_cpu.elf.
You can read a variable at run time, by not loading the elf file.
To do this use -n to "not" load the file:

   load-lm32 -n rt_cpu.elf pstate=

We still need the file to read the symbol table.  So, <var>= reads
the variable, and <write>=<value> changes it. You can pass several
such actions on the same command line. Please note that you can't
change variables in the BSS section, which is zeroed at run time.

All symbols are trated as 32-bit integer values, so this is not really
generic enough for everything:

  wrs-192.168.16.9# load-lm32 -n rt_cpu.elf memset=
  memset = 134253659 (0x08008c5b)

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>