tdfx's use of PIOOffset
macallan at netbsd.org
Wed Oct 19 01:06:40 PDT 2011
On Wed, 19 Oct 2011 00:53:55 -0700
Jeremy Huddleston <jeremyhu at apple.com> wrote:
> So the tdfx driver has this hunk of code in it currently does the following:
> #if USE_PCIVGAIO
> hwp->PIOOffset = pTDFX->PIOBase - 0x300;
> Can someone please explain to me why it's doing that?
On this particular chip the legacy VGA registers are mapped by the IO BAR instead of getting special treatment.
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