dm9000_read_locked
status = dm9000_read_locked(db, DM9000_EPCR);
ret = dm9000_read_locked(dm, DM9000_NSR) & NSR_LINKST ? 1 : 0;
unsigned ncr = dm9000_read_locked(db, DM9000_NCR);
unsigned nsr = dm9000_read_locked(db, DM9000_NSR);