beaglebone: Expand "ROM" size to 4MB.

Now that the ROM size is decoupled from the size of the on chip RAM,
it's size is now only constrained by the size of the medium it's loaded
from and the memory it's being loaded into, probably GBs in both cases.
Making it 4MB is a reasonable compromise between giving the payload lots
of breathing room and wasting space on the source medium which won't be
used.

Change-Id: I80932e0d4ce2dad02c3879345382e7d6ba44503a
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3422
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed