linux-kernel - Re: [RFC][PATCH 1/1] x86, efi: EFI boot stub config file support

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Date:	Sat, 2 Jun 2012 14:32:01 -0400
From:	Shea Levy <shea@...alevy.com>
To:	Matt Fleming <matt.fleming@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	ThomasGleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Maarten Lankhorst <m.b.lankhorst@...il.com>
Subject: Re: [RFC][PATCH 1/1] x86, efi: EFI boot stub config file support


On May 31, 2012, at 11:41, Matt Fleming <matt.fleming@...el.com> wrote:

> On Tue, 2012-03-20 at 18:22 -0400, Shea Levy wrote:
>> On 03/18/2012 11:49 AM, Shea Levy wrote:
>>> On 3/18/12 11:45 AM, Shea Levy wrote:
>>>> Hello,
>>>> 
>>>> Inlined is a patch to have the kernel read its parameters from a
>>>> config file when booted via the EFI boot stub without any parameters
>>>> passed. This patch roughly follows the plan I discussed when
>>>> proposing this idea, except now the file is found relative to the
>>>> location of the bzImage and there is no additional check to see if
>>>> image->parent_handle is NULL (despite the spec saying it will be NULL
>>>> when the image was loaded by the firmware itself, it was never NULL
>>>> on any of the systems I tested).
>>>> 
>>>> Cheers,
>>>> Shea Levy
>> 
>> I haven't yet gotten a reply to this, should I wait until after the 
>> merge window and resubmit it then?
> 
> I'm wondering what use case you're catering for here that can't be
> handled with efibootmgr? What problem does this patch fix?
> 

This fixes cases where efibootmgr doesn't work, either by design (in the case of removable boot media like a livecd) or due to firmware non-conformity (like VirtualBox's EFI emulation).

I had been waiting for the efi_printk stuff to get merged (for some reason I was under the impression it would be in 3.4) before submitting an updated version of this, and in the mean-time have been using the EDK shell + a startup.nsh file for the livecd case.--
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