linux-kernel - Re: [RFC] arm64: Early printk support for virtio-mmio console devices.

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Message-ID: <20130419093624.GC13283@mudshark.cambridge.arm.com>
Date:	Fri, 19 Apr 2013 10:36:24 +0100
From:	Will Deacon <will.deacon@....com>
To:	Peter Maydell <peter.maydell@...aro.org>
Cc:	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC] arm64: Early printk support for virtio-mmio console
 devices.

On Fri, Apr 19, 2013 at 10:30:40AM +0100, Peter Maydell wrote:
> On 19 April 2013 10:27, Will Deacon <will.deacon@....com> wrote:
> > On Fri, Apr 19, 2013 at 10:25:35AM +0100, Pranavkumar Sawargaonkar wrote:
> >> I am not against using 8250 emulation (as far as it solves printk
> >> issues for kernel booting logs), but my point is why not to add early
> >> read-write support for virtio console, which also can be useful in
> >> emulation less mach-virt environment also ?
> >
> > We can have both, but only one of those requires a change to the virtio
> > specification.
> 
> I don't think avoiding writing a spec is necessarily a good reason
> for insisting on emulation of a lump of hardware 95% of whose
> capabilities you aren't going to use...

Don't get me wrong; I'm in favour of having earlyprintk over virtio console
too, I'm just pointing out that we can also plug in the 8250 emulation that
we already have with very little effort. I'm not insisting on anything.

Will
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