linux-kernel - Re: [PATCH 0/2] Early printk support for virtio console devices.

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Message-ID: <5189234D.3040208@codeaurora.org>
Date:	Tue, 07 May 2013 11:52:45 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Peter Maydell <peter.maydell@...aro.org>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	Alexander Graf <agraf@...e.de>,
	Amit Shah <amit.shah@...hat.com>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
Subject: Re: [PATCH 0/2] Early printk support for virtio console devices.

On 05/07/2013 08:19 AM, Peter Maydell wrote:
> On 7 May 2013 05:46, Rusty Russell <rusty@...tcorp.com.au> wrote:
>> Peter Maydell <peter.maydell@...aro.org> writes:
>>> That all looks like sensible QEMU implementation possibilities
>>> but it seems to be a bit of a non-sequitur from "how do we
>>> tell the kernel to actually use this?"
>>
>> You enable the feature in the virtio console device, and a kernel
>> compiled with EARLY_PRINTK will use it?
> 
> Well, at the moment EARLY_PRINTK is hardcoded to
> "use some specific UART or equivalent selected at
> compile time". So the equivalent presumably would
> be to hard-compile "use virtio-console", but then
> how does that code know where the virtio-console
> is in the address space?

arm64 uses a kernel argument.

Christopher

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