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

To: Jan Beulich <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH] make c/s 21089 work again with c/s 21092
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 13 Apr 2010 12:11:16 -0400
Cc: Bastian Blank <waldi@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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On Tue, Apr 13, 2010 at 04:53:35PM +0100, Jan Beulich wrote:
> >>> Bastian Blank <waldi@xxxxxxxxxx> 13.04.10 17:10 >>>
> >On Tue, Apr 13, 2010 at 02:36:55PM +0100, Jan Beulich wrote:
> >> Unfortunately the latter c/s' change to mpparse.c yielded the former
> >> patch non-functional - Xen's serial port IRQ is not in IQR_DISABLED
> >> state, yet must be allowed to get its trigger mode and polarity set
> >> up in order for it to be usable.
> >
> >This looks not right. The original patch was designed to keep this
> >function away from the irqs of the serial port. This patch adds another
> >check for disallowing access but does not touch the IQR_DISABLED check.
> >
> >Please explain which machines have non-legacy configured interrupts for
> >the first two serial ports.
> 
> 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

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