ppb_poll_bus
error = ppb_poll_bus(bus, PPB_FOREVER, nBUSY, nBUSY,
return (ppb_poll_bus(bus, 4, mask, status, PPB_NOINTR | PPB_POLL));
return (ppb_poll_bus(bus, 100, mask, status, PPB_NOINTR | PPB_POLL));
if (ppb_poll_bus(bus, 40, nACK | SELECT | nFAULT,
extern int ppb_poll_bus(device_t, int, uint8_t, uint8_t, int);