the device driver instead of happening automagically in the HC driver.
This affects both the HC-USBD interface as well as the USBD-device
interface.
This change will allow DMA buffers to be reused e.g. in isochronous
traffic.
Add isochronous support to the UHCI driver (not for OHCI yet).
since a few things don't yet work properly:
- Sense data isn't reported properly (err, at all).
- It doesn't work with anything other than the Iomega USB Zip drive.
- Hot-unplug doesn't work yet.
...but this is enough to make my shiny new USB Zip drive go.
