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

[Christopher Covington]

On 05/07/2013 08:19 AM, Peter Maydell wrote:
> On 7 May 2013 05:46, Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:
>> Peter Maydell <peter.maydell@xxxxxxxxxx> 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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