ohci for AT91RM9200

This forum is for users of Microchip MPUs and who are interested in using Linux OS.

Moderator: nferre

Posts: 31
Joined: Thu Sep 16, 2004 3:10 pm

ohci for AT91RM9200

Wed Feb 09, 2005 11:18 pm

I'm getting an ohci error when Linux is starting:

host/usb-ohci.c: OHCI Unrecoverable Error, controller usb-usb-ohci disabled

I don't have any problems on the DK using 2.4.19-rmk7. On our custom board we're using 2.4.27-vrs1. We are also using the PQFP which only has one host port.
Any ideas?
David Peters
Location: Atmel Rousset
Posts: 60
Joined: Mon Feb 16, 2004 1:34 pm

Mon Feb 21, 2005 6:37 pm


On the PQFP package of the AT91RM9200, the 2nd port of the UHP is unbonded, AND there is NO pull-down on DP and DM.
This explain the error you have .
One sw modification is to hardcode the NDP field of the HcRhDescriptorA operational register to 1.


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