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Linux/DRA745: TI-evm board uboot unable to find usb storage

Expert 1455 points

Replies: 5

Views: 808

Part Number: DRA745

Tool/software: Linux

Hi,

board: TI-evm DRA74x 

uboot version: 2016.05

sdk: ti-processor-sdk-linux-automotive-dra7xx-evm-03_02_00_03

usb start :can't find usb storage.

but the USB2 can find the device after starting the system,why the uboot can't find it.

thanks,

Cesar

5 Replies

  • Hi Cesar,

    I have forwarded your question to USB expert.

    Regards,
    Yordan
  • In reply to Yordan Kamenov:

    Cesar

    So, the port is working fine in kernel, the device got detected. But not working in u-boot right.
    The procedure in u-boot is correct, let me check on u-boot and come back on this.

    Regards
    Ravi

    If my reply answers your question then please click on the green button "Verify Answer"

  • In reply to Ravi B:

    Hi Ravi,

    I found the cause of the problem, the usb working that to reduce the  phy2  impedance(0.1Ω~2.5Ω)

    What explains this,why the phy2 can work without this operation on the kernel.

    regards,

    Cesar

  • In reply to Cesar.Xi:

    Cesar

    This register is used to fine tune the signal strength for better eye diagram.
    What is the value you have configured to make it work ?

    Regards
    Ravi

    If my reply answers your question then please click on the green button "Verify Answer"

  • In reply to Ravi B:

    Hi Ravi,

    the value(MEM_RTERM_RMX) are [0x1 ~ 0xA] within this range make it work.

    why it must fine tune the signal strength, and it doesn't need configure on the kernel make it work.

    regards,
    Cesar

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