DM648 and ethernet

Christopher Droese

I have managed to get the hello world example from, the NDK 2.0 + patch to work. Also written was a UDP send function to allow for the communication needed in the project I am working on. The real issue is that the board will only work when connected to a gigabit ethernet port. With this you can ping and send UDP packets and they will be recieved. When you connect to a 100Mb link the board will not respond to ping and none of the packets will be delivered.

Has anyone ever had such a problem, or know a way to solve it. Will updating the libraries from the 2.20.03.24 ndk help any of these issues or anything else really.

Thanks for the help!

over 14 years ago

0 Bill Taboada over 14 years ago

TI__Mastermind 42545 points

This sounds like an SGMII negotiation issue. A similar problem was discussed in the following post.

http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/439/p/111108/401189.aspx#401189

Do you have the DM648 configured as the slave for SGMII negotiations? If you have it configured as the master then the SGMII link will only operate correctly if the PHY is connected to a Gigabit Ethernet interface and has configured it's SGMII interface for Gbit. Note that the PHY is configured as the master for the SGMII negotiation so it can accommodate the different speeds on the copper side. It will send it's speed to the DM648 which should be configured as the slave.

0 Christopher Droese over 14 years ago in reply to Bill Taboada

Prodigy 40 points

Thanks Bill, I am no longer working with this board but passed the information onto the relevenat person. However the problem was solved in the short term by purchasing Gigabit hardware...

Processors

Processors forum

DM648 and ethernet