SNLA343A April   2020  – July 2021 DP83825I

 

  1.   Trademarks
  2. 1Introduction
  3. 2Device Overview
  4. 3Merging DP83825 Onto Sitara Steps
    1. 3.1  Step 1 – DP83825 vs. DP83822
    2. 3.2  Step 2 – Check 8710A Pins with AM335
    3. 3.3  Step 3 – De-populate the LAN8710A from AM335 EVM - BBB
    4. 3.4  Step 4 – Check the AM335 (BBB) RMII Connection Pins
    5. 3.5  Step 5 – Check the DP83825 Connection Pins
    6. 3.6  Step 6 – PinMux Tool To Generate DTS/DTSI Files.
    7. 3.7  Step 7 – DP83822 Code Base Review
    8. 3.8  Step 8 – DP83825 Code Base Review / Patch Adaption
    9. 3.9  Step 9 – Patch the Linux uboot/kernel
    10. 3.10 Step 10 – Change the Menu Config
    11. 3.11 Step 11 – Building the Components (menuconfig/dtb/zimage)
    12. 3.12 Step 12 – (Optional) Important Fix for DTS Build
    13. 3.13 Step 13 – Copy the Built Files onto the SD Card
    14. 3.14 Step 14 – Register Checking for the DP83825.
    15. 3.15 Step 15 – Linux Command To Assist The Debug
    16. 3.16 Step 16 – Linux ethtool Command Dumps (example)
    17. 3.17 Step 17 – Linux dmesg to Check the Ethernet Driver Status.
    18. 3.18 Step 18 – Testing Result with Detail Log Analysis (Success Case).
    19. 3.19 Step 19 – YouTube Demonstration Video
  5. 4Required Hardware and Software
    1. 4.1 Hardware
    2. 4.2 Software
  6. 5References
  7. 6Revision History

3 Merging DP83825 Onto Sitara Steps

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.
GUID-9E6067F2-8216-41F6-8CD7-61FCC368B515-low.png Figure 3-1 Merged Concept