From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jerry Van Baren Date: Fri, 10 Mar 2006 15:24:25 -0500 Subject: [U-Boot-Users] SCC3 with very slow ethernet connection In-Reply-To: <4051B1A83682514BA8529BCADDA45F08370F7C@PTLISI050MSX.PT001.SIEMENS.NET> References: <4051B1A83682514BA8529BCADDA45F08370F7C@PTLISI050MSX.PT001.SIEMENS.NET> Message-ID: <4411E079.3090303@smiths-aerospace.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Franca, Jose Filipe (ext) wrote: > Hello u all! > > I have a mpc8247 based board, with the following ethernet configuration: [snip] > The result of this is a slow SCC3 ethernet connection. I've checked all the steps listed in the mpc8272 reference manual and everything seems to be by the book... > From snifing around with ethereal, i've noticed that the frames seem to be passed nicely. But, sometimes there are some frames that aren't received and i get bit 11 asserted (NO Rx nonoctet-aligned frame. Set when a frame containing a number of bits not divisible by eight is received. Also, the CRC check that occurs at the preceding byte boundary generated an error.). > What am i missing here? Any ideas? > Thanks a lot for reading! Many more if you reply :) > > > > > Best regards, > Filipe Fran?a. Hardware problem? Sounds like noise in the ethernet receive subsystem. Do you have proper (impedance controlled and low noise) routing between the RJ-45, transformer, and the PHY? Are the lines terminated properly at the transformer? gvb