CHIPC_SPI_FLASHCTL
if (!(SPI_READ(sc, CHIPC_SPI_FLASHCTL) & CHIPC_SPI_FLASHCTL_START))
SPI_READ(sc, CHIPC_SPI_FLASHCTL),
SPI_WRITE(sc, CHIPC_SPI_FLASHCTL, ctl);
SPI_WRITE(sc, CHIPC_SPI_FLASHCTL, 0);