Also use BUS_DMA_ALLOCNOW to be on the safe side.
2. Look for the Descriptor Error, and Descriptor Protocol Error flags from
the card, and down the interface if we detect either.
#1 (along with fixes to busdma) makes sure that this card works in all
memory situations. Prior to this change, it was just luck that 512 count
RX/TX lists were properly aligned. Now we can use any size of RX/TX lists
and still have them properly aligned.
#2 ensures that we don't get into an endless interrupt storm if busdma fails
us. Descriptor Protocol Error would occur if we misaligned the TX/RX rings,
and Descriptor Error would occur if we tried to give the card descriptors
or rings with addresses > 1G. Trying to reinitialize the card isn't going
to fix these errors, hence we don't try.
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