I have a question related to OHCI/UHCI : Are they compatible?

I have a board with am1808 microprocessor and an ACM USB dongle.
I cannot make them communicate each one to the other.
My ACM USB dongle uses UHCI whereas the board with am1808 supports only OHCI.

Can OHCI and UHCI be incompatible so that my USB ACM dongle is not detected by the board?