On Tue, 2011-03-08 at 13:23 +0100, David Rütti wrote:
>
> Hello Bastian
>
> > > Please compile serial driver serial8250 as module instead into the
> kernel.
> >
> > Please explain why.
>
> I would like to provide a DomU serial port access according to the
> xen-wiki.
>
>
>
> To have access to the serial port in DomU, we need to prevent Dom0
> from taken hold of this piece of hardware
>
> add to /etc/hotplug/blacklist the following modules to exclude from
> being loaded
>
> 8250
>
> 8250_pnp
>
> serial_core
>
>
>
> domU config:
>
> irq = [ 4 ]
>
> ioports = [ "3f8-3ff" ]
>
> to load the modules in domU.
>
>
>
> I tried without unload the 8250 driver and starting the domU resuted
> in an IRQ 4 error.
So what you really need is to inhibit the 8250 driver from claiming the
ports/irqs associated with the serial points. I don't think you need to
inhibit the driver loading to do this.
I think this can be done with "8250.nr_uarts=0" on your domain 0 kernel
command line. (I've only ever used =1 myself but I'd expect =0 to work
by extension).
I see /sys/bus/platform/drivers/serial8250/{un,}bind on my systems, so
it's perhaps possible that you can also control this stuff even more
dynamically on a per-port basis too.
Ian.
>
>
>
> Kind regards
>
>
>
> David
>
--
Ian Campbell
Current Noise: Anathema - Thin Air
Government lies, and newspapers lie, but in a democracy they are different lies.
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