Re: What pokes the ISA IO port of 0x211 ?

[H. Peter Anvin]

Bart Van Assche wrote:
> On Mon, Apr 21, 2008 at 1:12 PM, Frantisek Rysanek
> <Frantisek.Rysanek@xxxxxxx> wrote:
> >  I'm dealing with an embedded PC motherboard that contains some custom
> >  circuitry (GPIO), accessible via an ISA IO range between 0x200 and
> >  0x218.
> >
> >  There's an interesting issue with this in recent Linux (tried
> >  2.6.22.6 and 2.6.24.2): something probes IO port 0x211 on boot, which
> >  happens to be an add-on buzzer control port - effectively the kernel
> >  boot launches an accoustic alarm :-)
> >
> >  Any ideas what this could be?
>
> Did you already have a look at /proc/ioports ? This file should
> contain every range of ISA bus address in use by any kernel component.

This might not be the case if a probe fails and the driver unload 
itself.  It might be easiest to put in a hack in the kernel by hacking 
outb/outw/outl and print stack trace when called when trying to poke 
this port.

For what it's worth, this port is specified as "Game Blaster" in the 
Interrupt List.

	-hpa


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