Lenovo X60 em workaround

Henrik Brix Andersen henrik at brixandersen.dk
Tue Apr 17 23:30:05 UTC 2007


On Mon, Jan 22, 2007 at 10:30:48AM -0800, Jack Vogel wrote:
>  Acknowledge... I can do better than that, I have a fix for this problem, and
>  its not temporary. Here is the code change (not a patch, I'm very busy),
>  its in hardware_init, should be obvious how to patch:
>        /* Make sure we have a good EEPROM before we read from it */
>         if (e1000_validate_nvm_checksum(&adapter->hw) < 0) {
>                 /*
>                 ** Some PCI-E parts fail the first check due to
>                 ** the link being in sleep state, call it again,
>                 ** if it fails a second time its a real issue.
>                 */
>                 if (e1000_validate_nvm_checksum(&adapter->hw) < 0) {
>                         device_printf(dev,
>                             "The EEPROM Checksum Is Not Valid\n");
>                         return (EIO);
>                 }
>         }
>  This is already checked into my code base at Intel, I've just been too
>  busy to do anything with it, be my guest if you wish to check it in after
>  testing...

I can confirm that the above patch fixes the frequent initialization
problems with em(4) on my IBM/Lenovo ThinkPad X60s. Without the patch,
I often see the following on boot when there is no link on the em(4)

Apr 17 22:05:12 lothlorien kernel: em0: The EEPROM Checksum Is Not Valid
Apr 17 22:05:12 lothlorien kernel: em0: Unable to initialize the hardware

With the patch, I can not reproduce the invalid checksum errors - the
second call to e1000_validate_nvm_checksum() succeeds.

Any chance of this patch hitting CURRENT anytime soon? :)

Henrik Brix Andersen <henrik at brixandersen.dk>
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