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

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Message-ID: <CAAHg+Hg=t97SJ0JPZYgrZaL+zimo-wbezwaj1BQvHqE-vf4VDA@mail.gmail.com>
Date:	Fri, 19 Apr 2013 15:04:56 +0530
From:	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
To:	Peter Maydell <peter.maydell@...aro.org>
Cc:	Will Deacon <will.deacon@....com>,
	"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 15:00, Peter Maydell <peter.maydell@...aro.org> 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...

True.
Also 8250 will require emulation of registers, and i am not sure about
if mach-virt will have any emulation of real hw ?

Thanks,
Pranav

>
> -- PMM
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