[FAQ] DRA821U-Q1: USXGMII +PCIE SUPPORT ON MAIN CPSW5G: J7200 EVM

Hi Gokul,

The below configuration enables PCIE+USXGMII on J7200 EVM.

Note: 10G is supported only from MAC Port-1 on Silicon Revision 2 SoC.

NOTE: This was tested on  J7200 EVM 11.02 LINUX SDK:

• Ensure that you have 2 J7200  boards.
  • Connect the ENET EXPANSION CONNECTOR of both the boards using a MAC to MAC bridge.
• Ensure that you apply the below patches to both the boards:
  • UBOOT :
    • Disable SERDES being configured from UBOOT so that Linux can configure it.

    • diff --git a/dts/upstream/src/arm64/ti/k3-j7200-main.dtsi b/dts/upstream/src/arm64/ti/k3-j7200-main.dtsi
      index 71f4eba4..2fccd3c7 100644
      --- a/dts/upstream/src/arm64/ti/k3-j7200-main.dtsi
      +++ b/dts/upstream/src/arm64/ti/k3-j7200-main.dtsi
      @@ -715,7 +715,7 @@
       
                      assigned-clocks = <&k3_clks 292 85>;
                      assigned-clock-parents = <&k3_clks 292 89>;
      -
      +               status = "disabled";
                      wiz0_pll0_refclk: pll0-refclk {
                              clocks = <&k3_clks 292 85>, <&serdes_refclk>;
                              clock-output-names = "wiz0_pll0_refclk";
      @@ -755,6 +755,7 @@
                              clock-names = "refclk";
                              #address-cells = <1>;
                              #size-cells = <0>;
      +                       status="disabled";
                      };
              };
       

  • Linux:
    • https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/1207.0001_2D00_Enable_2D00_PCIE_2D00_USXGMII_2D00_multilink_2D00_configuration_2D00_on_2D00_J7200.patch
  • uEnv.txt 
    • Copy this file to the boot partition(FAT32) of your sd card. 
    • Fullscreen 0841.uEnv.txt Download

      # This uEnv.txt file can contain additional environment settings that you
      # want to set in U-Boot at boot time.  This can be simple variables such
      # as the serverip or custom variables.  The format of this file is:
      #    variable=value
      # NOTE: This file will be evaluated after the bootcmd is run and the
      #       bootcmd must be set to load this file if it exists (this is the
      #       default on all newer U-Boot images.  This also means that some
      #       variables such as bootdelay cannot be changed by this file since
      #       it is not evaluated until the bootcmd is run.
      
      name_overlays=ti/k3-j7200-evm-usxgmii-exp1.dtbo
      
      

• Once the above changes are done, follow the below steps:
  • Rebuild uboot , linux , k3-j7200-common-proc-board.dtb, k3-j7200-evm-usxgmii-exp1.dtbo.
  • Copy these files to their appropriate locations in boot media.
  • Go to the <boot media root partition>/lib/firmware directory and enter the below commands 

    • sudo ln -s -f ti-ipc/j7200/ipc_echo_test_mcu2_0_release_strip.xer5f j7200-main-r5f0_0-fw
      sync

    • This ensures that ethfw also does not configure SERDES , so that Linux can configure it.

Output logs:

Best Regards

Gokul Praveen