PZERO
#define FWPRI ((PZERO+8)|PCATCH)
#define FLASH_DELAY(_sc, x) msleep(ifp, &(_sc)->an_mtx, PZERO, \
msleep(chan, mtx, PZERO, wmesg, timo)
taskqueue_start_threads(&sUSBTaskqueue, 1, PZERO, "usb taskq");