It only allows to use the full 32 bit address range for DMA. Without
the patch I'm limited to direct mapped memory (i.e. < ~900MB on i386).
With the patch highmem below 4GB can be used too.
Jens's bio patches don't have support for 64-bit DMA (at least not the
version I've used to build that patch). Because the bt848/878 chips
are 32-bit devices only I havn't even tried to fix that...
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