linux-kernel - Re: e1000: "fix" it on thinkpad x60 / eeprom checksum read fails

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Message-ID: <20060720170758.GA9938@atrey.karlin.mff.cuni.cz>
Date:	Thu, 20 Jul 2006 19:07:58 +0200
From:	Pavel Machek <pavel@....cz>
To:	Auke Kok <auke-jan.h.kok@...el.com>
Cc:	cramerj@...el.com, john.ronciak@...el.com,
	jesse.brandeburg@...el.com, jeffrey.t.kirsher@...el.com,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: e1000: "fix" it on thinkpad x60 / eeprom checksum read fails

Hi!

> >e1000 in thinkpad x60 fails without this dirty hack. What to do with
> >it?
> >
> >Signed-off-by: Pavel Machek <pavel@...e.cz>
> 
> NAK, certainly this should never be merged in any tree...
> 
> this is a known issue that we're tracking here:
> 
> http://sourceforge.net/tracker/index.php?func=detail&aid=1474679&group_id=42302&atid=447449
> 
> Summary of the issue:
> 
> Lenovo has used certain BIOS versions where ASPD/DSPD was turned on which 
> turns the PHY off when no cable is inserted to save power. The e1000 driver 
> already turns off this feature but can't do this until the driver is 
> loaded. It seems that turning this feature on causes the MAC to give read 
> errors.
> 
> Lenovo seems to have the feature turned off in their latest BIOS versions, 
> we encourage all people to upgrade their BIOS with the latest version from 
> Lenovo (available from their website). It seems that for at least 2 people, 
> this has fixed the problem.
> 
> Inserting a cable obviously might also work :)

Hehe.

> We did reproduce the problem initially with the old BIOS (1.01-1.03) on a 
> T60 system, but unfortunately the bug disappeared into nothingness.
> 
> Bypassing the checksum leaves the NIC in an uncertain state and is not 
> recommended.

Okay, perhaps this should be inserted as a comment into the driver,
and printk should be fixed to point at this explanation?

Can't we enable the driver with the bad checksum, then read the _real_
data?
								Pavel
-- 
Thanks, Sharp!
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