BSPI_MAST_N_BOOT_CTRL
if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1) == 0)
bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 0);
if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1))
bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 1);