linux-kernel - Re: e1000e: 2.6.27-rc1 corrupts EEPROM/NVM

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Message-ID: <48AA9757.3090002@csr.com>
Date:	Tue, 19 Aug 2008 10:50:15 +0100
From:	David Vrabel <david.vrabel@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Kernel development list <linux-kernel@...r.kernel.org>,
	e1000-devel@...ts.sourceforge.net, jeffrey.t.kirsher@...el.com,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Subject: Re: e1000e: 2.6.27-rc1 corrupts EEPROM/NVM

Andrew Morton wrote:
> On Fri, 08 Aug 2008 11:47:51 +0100 David Vrabel <david.vrabel@....com> wrote:
> 
>> 2.6.27-rc1 kernels appear to corrupt the EEPROM/NVM of the 8086:294c
>> ethernet device (ICH9 I think).  After hacking the driver to ignore the
>> bad CRC and MAC address I could view the EEPROM with ethtool and it was
>> all 0xff.
>>
>> Testing EEPROM reads and writes with ethtool appeared to work but after
>> a reboot of the system the ethernet device (see lspci -v output) was no
>> longer present.  Could invalid EEPROM contents with a valid CRC (as
>> would be the case after my read/write tests) result in the device
>> failing to enumerate on the PCIe bus?

FYI, Jesse Brandeburg replied off-list and said that a corrupt EEPROM
with a valid CRC can result in the device failing to enumerate.

> Is this still happening in Linus's current tree?

I don't know, and I'm reluctant to try until I have a reliable way to
restore an erased EEPROM.

> Was 2.6.26 OK?

2.6.26 was fine.

David
-- 
David Vrabel, Senior Software Engineer, Drivers
CSR, Churchill House, Cambridge Business Park,  Tel: +44 (0)1223 692562
Cowley Road, Cambridge, CB4 0WZ                 http://www.csr.com/
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