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

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Message-ID: <CAFEAcA9jBSpN2p9ZaU+_gX41Ke3nvpSKVrWV8Rioy_ioadKCgg@mail.gmail.com>
Date:	Tue, 7 May 2013 13:19:46 +0100
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Alexander Graf <agraf@...e.de>,
	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"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>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	Amit Shah <amit.shah@...hat.com>
Subject: Re: [PATCH 0/2] Early printk support for virtio console devices.

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?

-- PMM
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