Less functional than libata this just uses the merged interface provided for
dumb legacy OS's.  This is basically a bridge for people not yet ready to use
libata for some reason or another.

Port visibility is entirely dependant on the BIOS setup.
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>