linux-kernel - Re: EFI Boot Stub Early Console

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Message-ID: <4F5E775D.7080702@zytor.com>
Date:	Mon, 12 Mar 2012 15:23:25 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Shea Levy <shea@...alevy.com>
CC:	linux-kernel@...r.kernel.org, matt.fleming@...el.com
Subject: Re: EFI Boot Stub Early Console

On 03/12/2012 03:18 PM, Shea Levy wrote:
> On 3/12/12 6:11 PM, H. Peter Anvin wrote:
>> On 03/12/2012 12:00 PM, Shea Levy wrote:
>>> On 3/12/12 2:56 PM, Shea Levy wrote:
>>>> console=tty0
>>> Sorry, that should have been console=ttyS0
>> Have you tried earlyprintk=serial,ttyS0?
>>
>>     -hpa
>>
> 
> Just tried. Still nothing in the VirtualBox window, serial port showed
> boot output up until "[    0.000000] console [tty0] enabled, bootconsole
> disabled", when the rest of the boot process happened in VirtualBox.
> 

That sounds like one would expect, no?

I don't think anyone has implemented an EFI earlyconsole yet, and you
can't rely on EFI handing over the screen in a mode the kernel can
handle with earlyconsole=vga, so there aren't really any other alternatives.

	-hpa

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