Subject: Re: EG20T and Micrel KSZ9021 Gigabit Ethernet

From: James Kosin <[email-masked]>
Date: Thu, 25 Oct 2012 16:30:52 -0400

On 10/16/2012 1:13 PM, James Kosin wrote:
> Hmmm... interesting turn of events.
>
> The problem seems to be in 10 speed support.  I hooked the Ethernet
> PHY to a100TX port and don't get these errors.
>
> James
>
> On 10/5/2012 5:09 PM, Francois Romieu wrote:
>> (please don't top post)
>>
>> James Kosin <[email-masked]> :
>>> The driver is always reporting:
>>>     [...] pch_gbe: Transfer Carrier Sense Error
>> You should send more information. Say dmesg, link stats (ip link),
>> ethtool information, stats and offload settings.
>>
>> We have a small Micrel ksz9021 phy driver that the pch_gbe driver does
>> not use and the latter pokes into some phy specific register (0x10) that
>> the Micrel document does not include in its list of vendor registers...
>>
>> Does your motherboard vendor offer some linux driver ?
>>
>> /note to myself: pch_gbe should use standard mii.h registers instead
>> of defining its own redundant set of registers.
>>
>> --
>> Ueimor
>>
>
Ueimor & All,

The "Transfer Carrier Sense Error" seems to have been hardware related. 
I replaced with a 10/100Mbps device and the interface is working
correctly now.  My hardware engineer is going to look at the 10Mbps HUB
later to find out what is going on with that piece of equipment; so, we
know what to do when we have future issues.

James