royger 928f86ffd6 MFC r271099: revert r269814: blkfront: add support for unmapped IO
Current busdma code for unmapped bios will not properly align the
segment size, causing corruption on blkfront devices. Revert the commit
until busdma code is fixed.

Reported by:	mav
Approved by:	re
2014-09-15 08:58:17 +00:00
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