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

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Message-ID: <CAFEAcA8j124G=vaHObJ_w5wOhUiS3KYKbjMnigbnr6mgwFxZUg@mail.gmail.com>
Date:	Fri, 19 Apr 2013 10:30:40 +0100
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Will Deacon <will.deacon@....com>
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 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...

-- PMM
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