linux-kernel - Re: [PATCH] Fix e820 end address with EFI

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Date:	Sun, 01 Mar 2009 18:16:17 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Huang Ying <ying.huang@...el.com>
CC:	Brian Maly <bmaly@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix e820 end address with EFI

Huang Ying wrote:
> On Mon, 2009-03-02 at 09:39 +0800, Brian Maly wrote:
>> Huang Ying wrote: 
>>> Hi, Brian,
>>>
>>> On Mon, 2009-03-02 at 04:13 +0800, Brian Maly wrote:
>>>   
>>>> I was able verify the kernel that does not boot on the MacBook (vanilla 
>>>> 2.6.29-rc4) does call efi_ioremap() which bails out early returning 
>>>> NULL. So no remapping happens in this case.  I have no idea if 
>>>> efi_ioremap ever does succeed in mapping any ranges though being I have 
>>>> no video or console this early in the boot and have to rely on triple 
>>>> faulting as a means of debugging.
>>>>     
>>> Please attach your dmesg of successful boot, so we can take a look at
>>> the EFI memory map.
>>>
>>> Best Regards,
>>> Huang Ying
>>>   
>> This dmesg is from a 2.6.25 kernel which works fine. I can gather
>> other debugging info from the booting kernels if needed. But its a
>> challenge to debug the bad kernel being efifb is initialized very late
>> (so you never even get to the video initialization and cant see any
>> logged messages) and since its a MacBook I dont have a real serial
>> port for serial console. The efi map is for MacBook has a different
>> layout from other EFI systems I have to test on. 2.6.29 kernel works
>> on every EFI system I have except MacBook.
> 
> It seems that you have an EFI system which has too big runtime area.
> 
> EFI: mem44: type=0, attr=0x8000000000000000, range=[0x000000007ff00000-0x0000000080000000) (1MB)
> 
> efi_ioremap() can map only memory range < 400k now.
> 
> It seems that efi_ioremap is the bottle net now. Can we just use
> init_memory_mapping() instead of efi_ioremap() for EFI runtime area?
> 
> Yinghai, how about your opinion?

you could call init_memory_maping() in that efi_ioremap position?

problems is how about 32bit?

YH
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