Check for device faults and for failures to set DRQ when expected, rather than spinning forever.  This fixes booting with CF ejected.
Check for device faults and for failures to set DRQ when expected, rather
than spinning forever.  This fixes booting with CF ejected.

NB: I've made the driver pretty chatty about errors in case there's hardware
    that operates differently to mine, so we can easily track down any issues.

Reviewed by:	imp
Sponsored by:	Packet Forensics

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