DP83825 is a low-cost Ethernet Phy. This document validates that the DP83825 Phy is compatible with the Linux Platform and uses the smallest TI Linux Platform EVM (BeagleBoneBlack) for a base. Follow the steps in this document to use the DP83825 Phy as specified.

Figure 2-1, is a Sitara MDIO / MII arch example. In the Figure 2-1, the MDIO is a control interface to control the Phy (example: DP83825), and the MII is an interface for the Data Channel between CPU and Phy.

Figure 2-2, show an example that the MII can be replaced by the other Ethernet Phy spec, for example (RMII, RGMII, SGMII and so on). MDIO control interface can be replaced by I²C/SPI.

While using TI Sitara platform to adapt the TI Phy, we are continuing with MDIO. The EMAC in the Figure 2-2 is an Ethernet MAC layer.

For additional information about merging these two sections, Figure 3-1 shows the merged concept.

The BBB uses MII with Microchip Phy LAN8710A, we need to change the hardware and software setting to RMII for adapting to the TI Phy DP83825.

1. To find the difference between DP83825 vs, DP83822, DP83822 is RGMII + RMII + MII; DP83825 is only having RMII.
2. Check the Phy on AM335 BeagleBoneBlack (BBB).
3. De-populate the MicroChip LAN8710A from BBB.
4. Identify the BBB LAN8710A connection.
5. Identify the DP83825 connection.
6. Use the TI Pinmux tool.
7. Generate the DTSI file for DP83825 pin assignment.
8. Build the uboot / kernel for BBB.
9. Ping test with BBB+DP83825.