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

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Message-ID: <4DEFD17C.8000001@kernel.org>
Date:	Wed, 08 Jun 2011 12:46:04 -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 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.

good, they never test that. just let them to use bootcamp.

> 
>>> And we need to be able to map the boot services code, so we can't put 
>>> the kernel on top of it.
>>
>> after bootloader, those area should be free already.
> 
> That's what the spec says. Reality says differently. We need those 
> ranges to be available to the kernel until after SetVirtualAddressMap() 
> has been called, which means we need to avoid putting the kernel on top 
> of them.

bootloader will load kernel (bzImage) high, and it will decompressed to 16M ram position.

can you call SetVirtualAddressMap before you exit bootloader instead?

Yinghai
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