Upgrading Clearfog Pro to support CN9130 SOM

This guide is meant to explain how to upgrade the the ClearFog Pro to support both CN9130 SOM and A388 SOM.

25MHz reference clocks for Ethernet Switch and PHY

Note: Clearfog Pro revision 2.2.9 and later already include these changes.

Dis-/Assemble the components from table below:

The components locations are marked green / red in the pictures below:

Components side

Print Side

Impact

CN9130 SoM does not provide a 25MHz reference clock output, The changes outlined disconnect the SoM reference clock signal and replace it with crystals for both ethernet switch and port 6 phy.