diekema_jon wrote: > > > From: Dan Malek <dan at netx4.com> > > Organization: Embedded Edge, LLC > > > diekema_jon wrote: > > > > > - What clock multiplier are you using for the CPM? > > > I don't remember. I think it was clock mode 0010_011, which would > > be 133 MHz CPM and 166 MHz core. This is all pretty simple. Just > > pick your own clock speed and set the board descriptor in embed_config.c > > to match it. > > In order for fast Ethernet to work reliably, the CPM clock needs to be > >= 100 Mhz. > > If the CPM clock is 66 Mhz, then about 1 of 5-20 Tx packets will get > dropped. It also appears that Rx has precedence over Tx. We are > guessing that the CPM runs out of cycles at 66 Mhz while trying to > support fast ethernet.
??? I didn't think the SCC could support fast ethernet at any clock speed, thats why moto put the FEC (Fast Ethernet Controller) in the FEC, which supports fast ethernet at rates > 25Mhz (full duplex @ 40Mhz). ron ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
