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Unable to using RMII with OMAPL138 SoC

Mitesh Hiran
Mastermind 6235 points

Other Parts Discussed in Thread: OMAPL138

Hi, 

I have been using older version of the SDK 4_0_0_4 for Linux and have modified the device tree to get RMII interface working but now I am trying to use the latest SDK for OMAPL138 but with similar changes I am un-able to get this working, any help in this would be helpful. thanks 

  • 0
    Mastermind 6235 points

    Add following code in $(SDK_INSTALL_DIR)/board-support/linux*/arch/arm/boot/dts/da850.dtsi

    rmii_pins: pinmux_rmii_pins {
    pinctrl-single,bits = <
    /*
    * RMII_TXD_1, RMII_TXD_0, RMII_TXEN
    * RMII_RXD_1, RMII_RXN_0, RMII_RXER
    */
    0x38 0x88888800 0xffffff00
    /*
    * RMII_MHZ_50_CLK, RMII_CRS_DV
    */
    0x3c 0x00000080 0x000000ff
    >;
    };

    Add "ti,davinci-rmii-en = /bits/ 8 <1>;" (without the quotes) in eth0 section of the code in the same file.

    Add following code in $(SDK_INSTALL_DIR)/board-support/linux*/arch/arm/boot/dts/da850-lcdk.dts
    In &eth0 {} section, modify "pinctrl-0 = <&mii_pins>;" to "pinctrl-0 = <&rmii_pins>;"
    In &eth0 {} section, add phy-mode = "rmii";
    In &eth0 {} section, add phy-connection-type = "rmii";

  • 0 in reply to Mitesh Hiran
    TI__Guru**** 175641 points

    Hi,

    Our CPSW expert is out of office this week, please expect delay responses next week.

  • 0 in reply to Bin Liu
    Mastermind 6235 points

    Oh okay, thanks for letting me know, hope to get some response soon.. just struggling with this issue now.