msaitoh 263db65164 Add 40bit DMA bug workaround(BGEF_40BIT_BUG) from FreeBSD (part of r199670).
This workaround is for 5714/5715 controllers and is not actually a MAC
controller bug but an issue with the embedded PCIe to PCI-X bridge in the
device.
 This change uses bus_dmatag_subregion(), so this workaround won't work on some
archs which doesn't support bus_dmatag_subregion().
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$NetBSD: README,v 1.3 1998/08/15 03:02:46 mycroft Exp $

This directory contains files which are used during PCI configuration
and PCI device drivers.  Eventually, most of the device drivers and
some of the configuration support should become machine-independent
and be moved to a more general location.

The configuration support was implemented according to the `PCI Local
Bus Specification, Production Version, Revision 2.0' dated April 30,
1993.  Section numbers referred to in the code may be specific to that
edition of the specification.

Some attempt has been made to insure that the code works on rogue
machines where the BIOS doesn't do its job, but in general I can't
guarantee that.

--
- Charles M. Hannum
  NetBSD group
  August 8, 1994