If you are bringing up a board for the first time and the 100G Ethernet subsystem does not seem to be achieving lane alignment, the most likely problem is related to signal integrity. Signal integrity issues must be addressed before any other debugging can take place.
Even if lane alignment is achieved, periodic BIP8 errors create signal integrity issues. Check the BIP8 signals to assist with debugging.
Signal integrity should be debugged independently from the 100G Ethernet subsystem. The following checks should be made:
- Transceiver Settings
- Checking For Noise
- Bit Error Rate Testing
If assistance is required for transceiver and signal integrity debugging, contact AMD technical support.