On PowerPC it's very normal to not support all of the physical RAM
in real mode.
Oh? Are you referring to "real mode limit", or 32-bit
implementations with
more than 32 address lines, or something else?
Either way, RMO is a really bad name for this, since that name is
already
used for a similar but different concept.
Also, it seems you construct the physical address by masking out bits
from
the effective address. Most implementations will trap or machine
check if
you address outside of physical address space, instead.
Segher
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