AM18x and USB detection using HUB

Martin Ambrose

Hello.

I have a customer connecting a hub (USB2512BQFN36) to USB0 of AM18x.
Devices plugged into the hub are not detected in linux (2.6.37).

Devices plugged directly into USB1, which is a straight connection to the SoC, are detected.

Anyone suggestions appreciated.

Regards,

Martin

over 13 years ago

0 Ajay over 13 years ago

TI__Genius 9460 points

Do you Vbus to be 5V on hub's port? would advice you to get the hub connection reviewed.

Ajay

0 Alfred Lee over 13 years ago in reply to Ajay

Intellectual 255 points

I have the same problem. The hub circuit in our design is very similar to this:

http://www.smsc.com/media/Downloads_Public/usb/evb2512bc.pdf

Vbus doesn't come on implying PRTPWR from the hub isn't turned on. Do you have any suggestions besides drilling into the source code? Linux USB driver is new to me and so any point is greatly appreciated.

Thanks for the help.

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AM18x and USB detection using HUB