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Message-ID: <4A39AD4C.6020807@nodomain.org>
Date: Thu, 18 Jun 2009 03:58:20 +0100
From: Tony Hoyle <tmh@...omain.org>
To: linux-kernel@...r.kernel.org
Subject: Bug(?) in linux kernel EFI support
Hi,
I'm building kernels on an embedded system which uses an odd version of
EFI (elilo/egrub don't run for example, only its own shipped boot.efi
that loads a raw vmlinux). I've been unable to get it to boot with any
kernel > 2.6.24.7 - as in it doesn't start up far enough to get netconsole.
I've tracked it down to the following commit. Prior to this commit, it
boots.. after it, it doesn't:
e429795c68d3001ecae74f6465420c9f043b0ece is first bad commit
commit e429795c68d3001ecae74f6465420c9f043b0ece
Author: Huang, Ying <ying.huang@...el.com>
Date: Wed Jan 30 13:31:19 2008 +0100
x86: EFI runtime service support: remove duplicated code from efi_32.c
This patch removes the duplicated code between efi_32.c and efi.c.
Signed-off-by: Huang Ying <ying.huang@...el.com>
Cc: Andi Kleen <ak@...e.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
:040000 040000 e6ac42e8fddef99698e5ebb39ed0a3d0c18bf1ac
1974f788a81cc6ced68ce87345e107e614691831 M arch
:040000 040000 f7b172e407b45e571eac4612dc799e44e7b24928
20608b877d79449318d72a31dc202f2341f0fceb M include
Now I don't really understand the inner workings of EFI (or of the
kernel for that matter).. I imagine 32bit EFI-only booting is fairly
unusual and few platforms support it... is there anything that anyone
can see that could cause a crash in this patch?
I have no ability to see the actual fault - The device has no console
(the display is hardcoded to show a logo until X boots.. there's an fb
driver shipped with it that appears to be able to override that but it's
binary only*. There's no serial port on the board, only USB & Ethernet
- so I'm stuck with netconsole basically. kexec doesn't work (memory
regions have different names & kexec has hardcoded text searches..
patching it with the new names doesn't work either..).
I realise this makes things somewhat harder to debug :p I call it
challenging..
Tony
* despite a 'strings' saying GPL in the text.. sigh..
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