FLASH_ST_BUSY
if (sc->sc_status & FLASH_ST_BUSY)
sc->sc_status |= FLASH_ST_BUSY;
sc->sc_status &= ~FLASH_ST_BUSY;
if (sc->sc_status & FLASH_ST_BUSY)
sc->sc_status |= FLASH_ST_BUSY;
sc->sc_status &= ~FLASH_ST_BUSY;