changes.

initial device, and will also allow for e.g. a device menu to be presented
to the user.

getting suppressed.  :(

Change from using #if to #ifdef, since #if can't cope with string
constants.

Move ISA probe address logic from config.c into isa.c, create header file
config/isa.h.

Removed CONFIG_{PCI,ISA,PCMCIA}, since buses are now always compiled and
linked in only if required by the individual driver objects.

ROMs (AFAIK).

with generated headers.

Don't use -MP to generate phony rules for included files, otherwise
make won't use the pattern rule for config/%.h.  :(

timestamp on config.h to match the oldest fragment, to prevent make
from always attempting to rebuild the fragments.

header files.

Added REAL_FRAGMENT(), because it could conceivably be useful.

putchar() as well.