linux-kernel - Re: 2.6.39.1 immediately reboots/resets on EFI system

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Message-ID: <4DEFDA4A.9080500@kernel.org>
Date:	Wed, 08 Jun 2011 13:23:38 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Jim Bos <jim876@...all.nl>, "H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.39.1 immediately reboots/resets on EFI system

On 06/08/2011 01:09 PM, Matthew Garrett wrote:
> On Wed, Jun 08, 2011 at 01:03:25PM -0700, Yinghai Lu wrote:
>> On 06/08/2011 12:52 PM, Matthew Garrett wrote:
>>> On Wed, Jun 08, 2011 at 12:48:48PM -0700, Yinghai Lu wrote:
>>>> On 06/08/2011 12:38 PM, Matthew Garrett wrote:
>>>>> On Wed, Jun 08, 2011 at 12:35:54PM -0700, Yinghai Lu wrote:
>>>>>> On 06/08/2011 12:29 PM, Matthew Garrett wrote:
>>>>>>>> what former? you can not fix some corner case by breaking most other cases.
>>>>>>>
>>>>>>> All Dell laptops, all new Apples, some Lenovos, various Intel server 
>>>>>>> platforms. That I've found so far.
>>>>>>
>>>>>> do you mean before that patch, all those machine will not boot linux kernel with UEFI support?
>>>>>
>>>>> Correct.
>>>>
>>>> with or without EFI runtime services?
>>>
>>> They'll boot with noefi, but that's useless because there's then no way 
>>> to configure a bootloader.
>>
>> efibootmgr will need boot services in addition to run-time services?
> 
> No, SetVirtualAddressMap() calls into boot services. This is code, not 
> data. We have no control over what it does.

Maybe you can parse efimeminfo in arch/x86/boot/compressed/head_64.S to find right decompress position for kernel.

Yinghai
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