I/O Port Conflicts with PCI devices?

Paul Mackerras paulus at cs.anu.edu.au
Tue Feb 2 10:23:49 EST 1999

Bryan Christianson <bryanc at 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.


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