Re: ACPI and the PNP Layer

[Nate Lawson <nate-Y6VGUYTwhu0@public.gmane.org>]

On Sun, 1 Feb 2004, Matthew Wilcox wrote:
> On Sun, Feb 01, 2004 at 02:41:02AM +0000, Dino Klein wrote:
> > I took a quick look at the two files, and they are quite comparable
> > code-wise; the additional size in 8250_pnp.c is due to the extra comments
> > and EISA IDs defined.
> > Now about the legacy devices - wouldn't you say that the keyboard/PS2
> > driver should be modified to register with the ACPI bus, just in order to
> > have everything nice & neat? or how about the parallel port, or motherboard
> > based IRDA (PNP0510)?
> > Perhaps I'm just exaggerating with this, but I like to have things nice and
> > neat :)
>
> PS/2 is obsoleted by USB, as is parallel.  I don't know abut IRDA but I
> would expect it to show up as a PCI device normally.  Are manufacturers
> still making machines which have this as a non-PCI device?  Remember just
> because it's on the motherboard doesn't mean it's a non-PCI device.

Compare the output of acpidump and the datasheet for a Super I/O chip some
time.  Everything on the LPCB is legacy and is thus probed through ACPI,
not PCI.  IRDA is almost always on the Super I/O.

http://www.via.com.tw/en/Products/superIO.jsp

-Nate


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