LXT971A PHY debugging on MPC8540 Custom Board
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
Quoted 10 lines · 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 andTX_Dlines.
I carried out the MAC loop back test which passed . Then went on
Quoted 9 lines
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
Signature · 10 lines
Gerhard Jaeger <[email protected]> SYSGO AG Embedded and Real-Time Software www.sysgo.com | www.elinos.com | www.pikeos.com | www.osek.de -------------- next part -------------- A non-text attachment was scrubbed... Name: mpc85xx_tsec.patch Type: text/x-diff Size: 1119 bytes Desc: not available Url : http://lists.denx.de/pipermail/u-boot/attachments/20050614/49a25e41/attachment.patch
PATCH 1/1 Fix for LXT971PHY register definitions
In reply to Shirasat Girish-ags032Hi,
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...
Signature · 10 lines
Gerhard Jaeger <[email protected]> SYSGO AG Embedded and Real-Time Software www.sysgo.com | www.elinos.com | www.pikeos.com | www.osek.de -------------- next part -------------- A non-text attachment was scrubbed... Name: mpc85xx_tsec.patch Type: text/x-diff Size: 1119 bytes Desc: not available Url : http://lists.denx.de/pipermail/u-boot/attachments/20050621/eeb1070b/attachment.patch
Wolfgang Denk
AppliedPATCH 1/1 Fix for LXT971PHY register definitions
Quoted 5 lines · In message <[email protected]> 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
Signature · 7 lines
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.