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Date: Mon, 21 Apr 2008 13:40:08 -0400 From: "H. Peter Anvin" <hpa@...or.com> To: Bart Van Assche <bart.vanassche@...il.com> CC: Frantisek Rysanek <Frantisek.Rysanek@...t.cz>, linux-kernel@...r.kernel.org Subject: Re: What pokes the ISA IO port of 0x211 ? Bart Van Assche wrote: > On Mon, Apr 21, 2008 at 1:12 PM, Frantisek Rysanek > <Frantisek.Rysanek@...t.cz> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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