detect 3.3V cards for the 6710 and another method for the 6722. This
latter method is also how the 6729/6730 is supposed to detect 3.3V
cards. This method works great on my Fujitsu Stylistic 500. Sadly,
it appears that not all laptop makers are as detail oriented as the
folks that made the Stylistic. IBM Thinkpad 701C and AST Asentia 810N
both hang hard when the 6729 method is used, but at least the thinkpad
works when the 6710 method is used. The failure mode appears to be any
access to the memory that we've mapped the CIS in causes the machine to
hang until you eject the card. The Thinkpad, at least, works with this
change, and it doesn't break my Stylistic.
MFC after: 4 days
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