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TI Home » TI E2E Community » Support Forums » Embedded Software » Linux » Linux forum » am335x ZCE and USB
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am335x ZCE and USB

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Nikolaj ��sterbye
Posted by Nikolaj ��sterbye
on Aug 17 2012 03:42 AM
Prodigy60 points

Hi.

We are using the am335x ZCE package (13x13mm), which only has one USB PHY. I'm working with the Sitara Linux SDK (psp04.06.00.08).

I'm having problems getting the mass storage function working. Neither the deprecated 'g_file_storage.ko' driver or the new 'g_mass_storage.ko' driver seems to work.

The TRM mentions that the unbonded PHY has to be set in HOST mode, SUSPEND state and USB_CTRLx register needs certain bits set.

Do I need to configure the USB driver somehow for this to happen or has support for the ZCE package not been implemented in the SDK yet?

br.

Nikolaj

am335x usb ZCE
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  • Bin Liu
    Posted by Bin Liu
    on Aug 21 2012 10:19 AM
    Expert6560 points

    Even if the unbonded PHY is configured improperly, I don't think it should affect the other USB controller.

    Could you please provide more details?

    - kernel boot log including msg after connected am335x to host PC;
    - host PC dmesg after connected am335x (assuming you use Linux Host PC);
    - console log of command 'cat /proc/driver/musb_hdrc.0';
    - .config

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  • Nikolaj ��sterbye
    Posted by Nikolaj ��sterbye
    on Aug 22 2012 03:19 AM
    Prodigy60 points

    We are running on our own HW design but most of the SW is adapted from the BeagleBone configuration.

    The USB entries in the board file are:

    /* pinmux for usb0 drvvbus */
    static struct pinmux_config usb0_pin_mux[] = {
        {"usb0_drvvbus.usb0_drvvbus",    OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
        {NULL, 0},
    };

    static struct omap_musb_board_data musb_board_data = {
        .interface_type    = MUSB_INTERFACE_ULPI,
        /*
         * mode[0:3] = USB0PORT's mode
         * mode[4:7] = USB1PORT's mode
         * AM335X beta EVM has USB0 in OTG mode and USB1 in host mode.
         */
        .mode           = (MUSB_HOST << 4) | MUSB_PERIPHERAL,
        .power        = 500,
        .instances    = 0,
    };

    We are connecting directly to the am335x, so we don't have the FTDI chip, like the BeagleBone.

    I have attached the device kernel boot log, the kernel config file and the cat commands from before and after connecting the device to the host PC via USB cable.

    When connecting the device and PC, nothing happens in the host PC dmesg.

    br.

    Nikolaj

    7120.device_kernel_boot_log.txt

    7674.device_musb_hdrc.o_before_cable_attach.txt

    5353.device_musb_hdrc.o_after_cable_attach.txt

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  • Nikolaj ��sterbye
    Posted by Nikolaj ��sterbye
    on Aug 22 2012 06:34 AM
    Prodigy60 points

    Looks like the .config file didn't get attached.

    Here it is, renamed so it could be attached:

    3162.runmaster_small_defconfig.txt

    br.

    Nikolaj

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  • Bin Liu
    Posted by Bin Liu
    on Aug 22 2012 11:33 AM
    Expert6560 points

    Nikolaj,

    The log tells the MUSB controller detected VBUS, and SESSION is started, but it is not enumerated by the Host PC. We have some questions regarding your h/w design, and we will send you an email shortly.

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  • Nikolaj ��sterbye
    Posted by Nikolaj ��sterbye
    on Aug 22 2012 11:36 AM
    Prodigy60 points

    ok.

    Thanks

    Nikolaj

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  • Nikolaj ��sterbye
    Posted by Nikolaj ��sterbye
    on Aug 23 2012 10:57 AM
    Verified Answer
    Verified by Nikolaj ��sterbye
    Prodigy60 points

    Problem verified as an error in our HW design.

    Mass storage functionality is working now.

    br.

    Nikolaj

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