[U-Boot-Users] LXT971A PHY debugging on MPC8540 Custom Board

[U-Boot-Users] LXT971A PHY debugging on MPC8540 Custom Board

[Shirasat Girish-ags032]

Hi ,
   I have partially ported Uboot on one of our MPC8540 based custom boards.
I am currently facing problems in bringing up the 10/100Mbps FEC 
interface. We are using the LXT971A PHY for the FEC interface.
Well the problem is that , the MAC is putting out the data but the PHY is
failing to put the data on the line. The PHY is successfully able to auto-
negotiate. The MAC putting out data was confirmed by the MAC debug 
registers and by probing the Tx_EN,clock and TX_D lines.
   I  carried out the MAC loop back test which passed . Then went on

for the PHY internal loop back test. Well, when the loop back is enabled the
MAC fails to transmit the frame successfully. The thing confusing me is that
why the MAC frame transmission is getting affected when i enable the PHY
loopback test.
 Any pointers will be very helpful.

Regards,
Girish

[U-Boot-Users] LXT971A PHY debugging on MPC8540 Custom Board

[Gerhard Jaeger]

On Monday 13 June 2005 19:55, Shirasat Girish-ags032 wrote:
> Hi ,
>    I have partially ported Uboot on one of our MPC8540 based custom boards.
> I am currently facing problems in bringing up the 10/100Mbps FEC 
> interface. We are using the LXT971A PHY for the FEC interface.
> Well the problem is that , the MAC is putting out the data but the PHY is
> failing to put the data on the line. The PHY is successfully able to auto-
> negotiate. The MAC putting out data was confirmed by the MAC debug 
> registers and by probing the Tx_EN,clock and TX_D lines.
>    I  carried out the MAC loop back test which passed . Then went on
> 
> for the PHY internal loop back test. Well, when the loop back is enabled the
> MAC fails to transmit the frame successfully. The thing confusing me is that
> why the MAC frame transmission is getting affected when i enable the PHY
> loopback test.
>  Any pointers will be very helpful.
> 
> Regards,
> Girish
> 
Hi,

as I'm also doing some work on a custom MPC8540 board with a LTX971, I noticed,
that the register definitions and masks for the status-register 2 in
cpu/mpc85xx/tsec.h are wrong, maybe this has also something to do with your
problem! The attached patch fixes that. 

Maybe Wolfgang will also put that to CVS, as this is an obvious bug!

regards,
Gerhard

-- 
Gerhard Jaeger <gjaeger@sysgo.com>            
SYSGO AG                      Embedded and Real-Time Software
www.sysgo.com | www.elinos.com | www.pikeos.com | www.osek.de 
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[U-Boot-Users] [PATCH]Fix for LXT971PHY register definitions

[Gerhard Jaeger]

Hi,

seems my previous patch got somehow lost, so let's try again.
Ciao,
Gerhard


CHANGELOG:
* Patch by Gerhard Jaeger, 21-June-2005:
   Fixes wrong status register 2 definitions for LTX971 phy
   handling on mpc85xx boards.

Patch is attached...

-- 
Gerhard Jaeger <gjaeger@sysgo.com>            
SYSGO AG                      Embedded and Real-Time Software
www.sysgo.com | www.elinos.com | www.pikeos.com | www.osek.de 
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[U-Boot-Users] [PATCH]Fix for LXT971PHY register definitions

[Wolfgang Denk]

In message <200506210907.19376.g.jaeger@sysgo.com> you wrote:
>
> CHANGELOG:
> * Patch by Gerhard Jaeger, 21-June-2005:
>    Fixes wrong status register 2 definitions for LTX971 phy
>    handling on mpc85xx boards.

Applied, thanks.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Every revolutionary idea - in science, politics, art, or  whatever  -
evokes three stages of reaction in a hearer:
  1. It is completely impossible - don't waste my time.
  2. It is possible, but it is not worth doing.
  3. I said it was a good idea all along.