Andrew Gallatin 3a1b3a3fa7 On an AS 600 5/266 (and possibly others), accessing the configuration
space of PCI devices that don't exist cause PCI master & target aborts
rather than returning ~0 or giving a machine check.  Bring in some code
from NetBSD to handle this properly.

obtained from:	NetBSD
reviewed by:	dfr
1999-07-29 16:44:22 +00:00
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