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Subject: Re: 2.4.0-test11-pre7: isapnp hang
To: twaugh@redhat.com (Tim Waugh)
Date: Mon, 20 Nov 2000 00:09:06 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20001119233450.H20970@redhat.com> from "Tim Waugh" at Nov 19, 2000 11:34:50 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Reading from port 0x313 (my ISA NE2000 is at 0x300-0x31f) hangs my
> machine dead.  Unfortunately, reading from that port is exactly what
> the isapnp code does on boot, if compiled into the kernel.
> 
> Is it the network card's fault (probably), or is there a less invasive
> probe that isapnp could use (unlikely, I guess)?


That shouldnt be possible - we are supposed to start at 0x203 and skip the
problem area.


static int isapnp_next_rdp(void)
{
        int rdp = isapnp_rdp;
        while (rdp <= 0x3ff) {
                if (!check_region(rdp, 1)) {
                        isapnp_rdp = rdp;
                        return 0;
            	}
                rdp += RDP_STEP;
                /*
                 *      We cannot use NE2000 probe spaces for ISAPnP or we
                 *      will lock up machines.
                 */
                if(rdp >= 0x280 && rdp <= 0x380)
                        continue;
    	}
        return -1;
}

If you can find out why that port is being touched I'd like to know

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