linux-kernel - Re: EFI Boot Stub Early Console

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Message-ID: <1332069701.4041.42.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Sun, 18 Mar 2012 11:21:41 +0000
From:	Matt Fleming <matt.fleming@...el.com>
To:	Shea Levy <shea@...alevy.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: EFI Boot Stub Early Console

On Sat, 2012-03-17 at 09:12 -0400, Shea Levy wrote:
> On 3/12/12 6:23 PM, H. Peter Anvin wrote:
> > I don't think anyone has implemented an EFI earlyconsole yet
> 
> I'm considering taking a shot at this. Do you have any pointers about
> where to look or how to approach it? Will I have to use UGA/GOP or is
> there some way to take advantage of the text console after
> exit_boot_services?

I don't think you'll need to use the graphics protocols, you should just
be able to put something together using the 'output_string' function
from the EFI simple text output protocol, e.g. something like this,

	https://lkml.org/lkml/2012/3/16/193

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