>BUS_SPACE_MAXSIZE seems to be related to the 'largest xfer you will be allowed
>to do at one time'- which is wrong because MAXPHYS is larger.
If you look at the x86 implementation, BUS_SPACE_MAXSIZE is only
used in the non-GNUC case and is not referenced (I don't think)
by any driver code. Even setting it to MAXPHYS is not truely
correct since at some point we will have to start supporting
transfer mappings that are larger than what can be mapped by
a single buffer. I never realized that there was such controversy
over this value... it was just put in so that I could have something
for the non-GNUC case.
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