i.MX Processors中的主题 Re: U-Boot USBOTG device mode

U-Boot USBOTG device mode

chuey714 — Wed, 13 Sep 2017 18:59:07 GMT

Hi All,

We are working on our custom board that uses an iMX7D and are having issues with USB device mode in U-Boot. We are trying to mount the on board storage device (eMMC) to the USB. On the SABRE board, the storage device enumerates on a laptop but not with our custom board.

This is what we do:

=> usb start

starting USB...

USB0: Port not available.

USB1: USB EHCI 1.00

scanning bus 1 for devices... 1 USB Device(s) found

scanning usb for storage devices... 0 Storage Device(s) found

=> ums 0 mmc 0

UMS: LUN 0, dev 0, hwpart 0, sector 0x0, count 0xece000

At this point the progress indicator keeps spinning but nothing enumerates and then we cancel with CTRL-C.

Thanks in advance

Juan

Re: U-Boot USBOTG device mode

igorpadykov — Thu, 14 Sep 2017 05:38:11 GMT

Hi Juan

one can check USB_ID signal, it should be low in host mode

and high or float in device mode.

Best regards
igor
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Re: U-Boot USBOTG device mode

chuey714 — Thu, 14 Sep 2017 14:26:24 GMT

Yes, ID line is floating while trying to mount the eMMC to USB.