problems with OHCI-driver-development for a firewire-card (IEEE1394)

Tobias · *nix forums beginner Joined: 18 Mar 2005 Posts: 6

Hello,

I am about to develop a Firewire (IEEE1394) driver running under QNX
that accesses the LLC hardware via OHCI (OpenHostControllerInterface).
This is a standard communication interface for PCI that provides
register access to configure and run the hardware.

My problem is that I can't manage to get anything (not a single packet)
sent on the FireWire bus even though I apply the information from the
OHCI specification as precisely as I can. After configuration I am
seting the START bit in the ContextControl register, which should send
my configured packet out on the bus. But instead of sending it, the
error return "Unknown Event Code" [5'h0E] appears.

Does anybody have experience in OHCI programming? Could I have mistaken
the order of register accesses for this subject?

Tobias

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