From mboxrd@z Thu Jan 1 00:00:00 1970 From: prathika Date: Wed, 15 Apr 2009 16:17:30 +0530 Subject: [U-Boot] Ethernet receive issue in PPC440 In-Reply-To: <200904151038.49181.sr@denx.de> References: <49DEDDD7.6090505@deeopl.com> <200904141056.44165.sr@denx.de> <49E56072.5000306@deeopl.com> <200904151038.49181.sr@denx.de> Message-ID: <49E5BB42.20606@deeopl.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Stefan, Thanks for that information. Will get back when after analysing the received packets. Thanks & Regards, Prathika R Stefan Roese wrote: > On Wednesday 15 April 2009, prathika wrote: >> I am using PowerPC 440 EP. The PHY I am using is DP83848. I have >> enabled RMII mode. I am making sure that all the registers are >> configured for this mode only, by reading back the registers. >> >> First i tried enabling internal loopback in PowerPC by enabling the ILE >> bit in EMAC0_MR1 register. There was no issue. Then I wanted to test >> external loopback without RJ-45 cable. that is the data transmitted by >> Power PC is loop backed by the PHY. So i disabled the ILE bit and >> enabled FullDuplex FDE bit in EMAC0_MR1 register (As illustrated in the >> PowerPC User Manual). I also enabled Internal Loopback in PHY.I had no >> issues in this also. I was able to receive the looped back packets from >> the PHY. >> >> Also to make sure that PHY has no issue, there is a built in test >> facility avaiilable in the PHY. I also enabled that bit and cleared for >> the passing of the Built In Test of the PHY. >> >> But i never tried doing loop back with the RJ-45 cable. But when i >> cleared the loop back along the PHY path, should i also test looping >> back with the cable?? > > Such an loopback test using an external shortcut RJ45 cable is more for a > factory test of the interface. I just mentioned it to check which loopback > test you were doing. You can better test with an PC connected to the 4xx > EMAC. And this is what you are doing. > > So you should concentrate on the receive path of the 4xx driver and analyze > the errors that you are receiving. > > Best regards, > Stefan > > ===================================================================== > DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel > HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany > Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: office at denx.de > =====================================================================