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

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Message-ID: <CAFEAcA_WfYpyvq54rZqS8JZkmDF5JXB+CNHFH5CnrhKun52uzA@mail.gmail.com>
Date:	Fri, 19 Apr 2013 11:05:47 +0100
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>,
	"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 10:39, Will Deacon <will.deacon@....com> wrote:
> The point of mach-virt is that it is completely parameterised. So, if you're
> not emulating an 8250, then don't tell the kernel that you have one!
> Similarly, if you *do* emulate it, then either create a device-tree node for
> it or pass the appropriate earlyprintk= string on the command line.
>
> As far as kvmtool is concerned, we'd probably have a new command-line option
> for arm64, allowing you to specify the early console device.

Please make the kernel pick the device out of the device tree
blob. The whole point of device tree is that it's how to tell
the kernel where things live -- making kvmtool/QEMU and/or the
user also have to mess with the kernel command line is awkward
and annoying.

-- PMM
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