Re: [Xen-devel] Re: [PATCH] make c/s 21089 work again with c/s 21092

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Apr 14, 2010 at 07:41:30AM +0100, Jan Beulich wrote:
> >>> Konrad Rzeszutek Wilk  04/13/10 6:12 PM >>>
> >On Tue, Apr 13, 2010 at 04:53:35PM +0100, Jan Beulich wrote:
> >> I'm talking about PCI serial cards - in the one case I'm working with,
> >
> >Can't you use polling for it? For example this is what I do for my PCI
> >serial card:
> >
> >com1=115200,8n1,0xd800,0
> 
> It works with low rates of output, but in order to not use sync_console and 
> still be able to reliably get through high rate bursts of output, interrupt 
> driven communication seems to be the only reliable way (other than using 
> unreasonably high values with "serial_tx_buffer=").
> 
> And also from a more general perspective - why should legacy IRQs work, but 
> not PCI ones?

You have a good point. I actually had the darnest time getting these
cards to work with Linux so was quite happy to see Xen working so well
with them.

I will take a look at your patch.
> 
> Jan
> 
> 
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