On Wed, 23 Jun 2010, Andrea Righi wrote: > I'm trying to write a driver for the OXU210 PCI evaluation board, > integrating it into the EHCI subsystem (see the patch below). It's still > WIP, for now only the SPH host controller is supported (no OTG). > > Because this host controller can only access its own small SRAM area I'm > using the HCD_LOCAL_MEM flag and dma_declare_coherent_memory() to > enforce "local" memory utilization. > > The first issue I've found is that the controller seems to have problems > with unaliged memory accesses, so I applied a patch to the core HCD code > to remove the put/get_unaligned() stuff. > > After that something started to work, devices (mass storage, > usbs-serial, keyboard devices, etc.) are correctly recognized, but > there're still some issues. > > More exactly, bulk transfers don't seem to complete successfully very > often. For example when I connect a USB drive I get this from dmesg: ... > Any idea or suggestion that could help me to debug this problem is > welcome... Maybe the problem is in the device and not in your driver. You should try testing a different device, preferably one that runs at high speed instead of full speed. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
