USB ports swapped, USB0 will not enumerate

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1

Hello,

I have a custom board based on the Beaglebone Black, I’m trying to get the board to boot from USB, with nothing programmed on or SD card. I’m expecting to get the AM335 RNDIS to initiate as an Ethernet device. On our board (compared to the Beaglebone Black), we’re using USB0 with the OTG circuitry (instead of USB1) and forcing USB0 into device mode. The board is detected by the Linux PC, however, It will not enumerate.

The following is the dmesg I was able to get (running Ubuntu 12.04):

[424595.900132] usb 5-2: new full-speed USB device number 4 using uhci_hcd
[424596.075024] usb 5-2: unable to read config index 0 descriptor/all
[424596.075032] usb 5-2: can’t read configurations, error -71
[424596.188220] usb 5-2: new full-speed USB device number 5 using uhci_hcd
[424596.251145] usb 5-2: unable to read config index 0 descriptor/all
[424596.251158] usb 5-2: can’t read configurations, error -71
[424596.364184] usb 5-2: new full-speed USB device number 6 using uhci_hcd
[424596.422150] usb 5-2: unable to read config index 0 descriptor/all
[424596.422164] usb 5-2: can’t read configurations, error -71
[424596.423023] hub 5-0:1.0: unable to enumerate USB device on port 2

The board hardware has been modified slightly from the Beaglebone Black. First, we are using a type A usb connector, second, USB0 is now connected to the (USB1) OTG hardware, with USB0_ID pin floating (no access to USB1).

Are there any other modifications to hardware required to get this working?

Thanks

2

Sure this is a hardware-problem and not caused by the software on your board which is accessing the new/other USB port in a wrong way? Did your firmware ever work properly with the original BBB-hardware?

3

You may want to invest in a USB Protocol Analyzer. I’ve got a Total Phase Beagle 480, and it’s helped me quickly identify USB issues. It’s pricey if you’re playing along at home, but if this is for a business, get one. Finding the problem in 15 seconds will save you more money than the 2 weeks of lost engineering time stumbling around in the dark.

Here’s the model I’ve got:
http://www.totalphase.com/products/beagle-usb480/