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

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Date:	Thu, 18 Apr 2013 12:01:32 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	linaro-kernel@...ts.linaro.org, Anup Patel <anup.patel@...aro.org>,
	patches@...aro.org, linux-kernel@...r.kernel.org,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC] arm64: Early printk support for virtio-mmio console
 devices.

On 13:02 Thu 18 Apr     , Pranavkumar Sawargaonkar wrote:
> On 18 April 2013 12:21, Rusty Russell <rusty@...tcorp.com.au> wrote:
> >
> > PranavkumarSawargaonkar <pranavkumar@...aro.org> writes:
> > > From: Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
> > >
> > > This patch implements early printk support for virtio-mmio console devices without using any hypercalls.
> >
> > This makes some sense, though not sure that early console *read* makes
> > much sense.  I can see the PCI version of this being useful as well.
> 
> Read can be useful for "mach-virt" which will have only virtio console
> as a console device. Then if someone wants to have UEFI or any other
> boot-loader emulation, which expects user to input few things, in that
> case read might become handy.

yes I'm adding barebox on arm64 and will need it for virt target

Best Regards,
J.
> >
> >
> > The spec definition for this will be interesting, because it can be used
> > before the device is initialized (something which is generally
> > verboten).
> >
> > Cheers,
> > Rusty.
> 
> Thanks,
> Pranav
> 
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