Date: Thu, 18 Apr 2013 12:01:32 +0200
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>, linaro-kernel@lists.linaro.org,
        Anup Patel <anup.patel@linaro.org>, patches@linaro.org,
        linux-kernel@vger.kernel.org,
        "kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC] arm64: Early printk support for virtio-mmio console
 devices.
Message-ID: <20130418100132.GE4998@game.jcrosoft.org>
References: <1366264344-28025-1-git-send-email-pranavkumar@linaro.org>
 <87wqs02uws.fsf@rustcorp.com.au>
 <CAAHg+HiHKV+8hBT1QWe4hSxocCX6wpRd3bCPWB7zU8jVFmPuAA@mail.gmail.com>
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On 13:02 Thu 18 Apr     , Pranavkumar Sawargaonkar wrote:
> On 18 April 2013 12:21, Rusty Russell <rusty@rustcorp.com.au> wrote:
> >
> > PranavkumarSawargaonkar <pranavkumar@linaro.org> writes:
> > > From: Pranavkumar Sawargaonkar <pranavkumar@linaro.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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