uath_fwblock
struct uath_fwblock *txblock, *rxblock;
txblock = usbd_alloc_buffer(ctlxfer, sizeof (struct uath_fwblock));
rxblock = usbd_alloc_buffer(rxxfer, sizeof (struct uath_fwblock));
bzero(txblock, sizeof (struct uath_fwblock));
sizeof (struct uath_fwblock),
sizeof (struct uath_fwblock), USBD_SHORT_XFER_OK |