[bug and patch refers to current code in cvs]
param_block.c doesn't include <arch.h> which means
that PARAM_START is never defined in that compilation
unit and thus parse_ptags never gets a useful
parse_ptags also has a reference to PARAM_LEN. that
either needs to be defined explicitly or, as i have
done, converted to PARAM_FLASH_LEN.
[n.b., at least one of the ports (shannon) defines
PARAM_START as PARAM_RAM_BASE -- this can't be right
as main.c never moves the params from flash to ram.
setting PARAM_START to PARAM_FLASH_BASE does work.]