cvs commit: src/sys/dev/fdc fdc_isa.c

[Peter Wemm]

On Wednesday 01 September 2004 06:47 am, Doug Rabson wrote:
> On Tue, 2004-08-31 at 21:38, Wilko Bulte wrote:
> > On Tue, Aug 31, 2004 at 08:37:10PM +0000, Warner Losh wrote..
> >
> > > imp         2004-08-31 20:37:10 UTC
> > >
> > >   FreeBSD src repository
> > >
> > >   Modified files:
> > >     sys/dev/fdc          fdc_isa.c
> > >   Log:
> > >   When ISA_PNP_PROBE is called, it will return 0 when it finds a
> > > device, ENOENT when there's no PNP ID for this device node, or
> > > ENXIO when there is one, but it doesn't match.
> > >
> > >   In the nonPNP case (as most Alpha systems appear to be), we
> > > were
> >
> > I think no Alpha has PNP.
>
> All alphas with ISA busses support ISA PnP. I used to use it with an
> old ISA PnP sound card in my 164lx.

Exactly.  Firmware support isn't required.  ISA-PnP is a hardware level 
protocol.  You can plug an isa-pnp card into any machine with physical 
isa slots and have to use the isapnp interface to wake the card, probe 
it, assign irqs etc.  On PC's, this is typically done by the bios for 
compatability reasons.  It would pick some of the default settings that 
the card suggested.  A non-isapnp-aware OS could find the cards in 
their preconfigured location.  
-- 
Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5