From: Paul Mackerras <paulus@cs.anu.edu.au>
To: bryanc@ihug.co.nz
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: I/O Port Conflicts with PCI devices?
Date: Tue, 2 Feb 1999 10:23:49 +1100 [thread overview]
Message-ID: <199902012323.KAA24452@tango.anu.edu.au> (raw)
In-Reply-To: <l03130300b2dbb10d21bc@[172.16.10.14]> (message from Bryan Christianson on Tue, 2 Feb 1999 08:42:28 +1300)
Bryan Christianson <bryanc@ihug.co.nz> wrote:
> The following listing of /proc/pci shows that I have 2 devices reporting an
> I/O port of 0x400. Is this possible or am I not seeing the whole truth
> here? When I try to access the port (with inl() or outl()), the machine
> panics. I published this panic on the list last week and had no response.
Most likely neither devices is responding to I/O-space accesses
because the PCI_COMMAND_IO bit (enable response to I/O space accesses)
in the PCI command register isn't set. That would explain the machine
check when you try to access the device.
Paul.
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next prev parent reply other threads:[~1999-02-01 23:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-02-01 19:42 I/O Port Conflicts with PCI devices? Bryan Christianson
1999-02-01 23:23 ` Paul Mackerras [this message]
1999-02-02 6:33 ` Bryan Christianson
1999-02-02 8:41 ` Gabriel Paubert
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