linux-kernel - Re: [Bug #11382] e1000e: 2.6.27-rc1 corrupts EEPROM/NVM

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Message-ID: <21d7e9970809231409r3fdd640h53a72a808266d220@mail.gmail.com>
Date:	Wed, 24 Sep 2008 07:09:09 +1000
From:	"Dave Airlie" <airlied@...il.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	jkosina@...e.cz, david.vrabel@....com, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	chrisl@...are.com
Subject: Re: [Bug #11382] e1000e: 2.6.27-rc1 corrupts EEPROM/NVM

On Wed, Sep 24, 2008 at 7:05 AM, David Miller <davem@...emloft.net> wrote:
> From: Jiri Kosina <jkosina@...e.cz>
> Date: Tue, 23 Sep 2008 16:29:16 +0200 (CEST)
>
>> On Mon, 22 Sep 2008, David Miller wrote:
>>
>> > So I went through the changes from 2.6.27-rc5 until the SHA1
>> > ID ec0c15afb41fd9ad45b53468b60db50170e22346 and there were
>> > definitely no E1000 or E1000E changes during that time.
>>
>> Some recent comments on [1] seem to indicate that this is somehow coupled
>> into prior problems/panics with Intel graphics.
>
> My current suspicion in all of this is either the GEM kernel patches
> or recent X server.
>

I don't think OpenSUSE was shipping any of the GEM bits.

Dave.

> However, the eeprom/nvram programming sequence seems non-trivial on
> the e1000e.  You have to execute a set of precise register writes
> and register polls to successfully write things out to the nvram.
>
> This makes something like a random scribble out to MMIO space less
> likely to cause this problem.
>
> Is there some linear mapping of the nvram that could be written to
> on these cards?
>
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