nandc_write
nandc_write(nandc, SFLASHC_BURST_CFG, 0);
nandc_write(nandc, dev_cmd_reg_addr(nandc, NAND_DEV_CMD_VLD),
nandc_write(nandc, NAND_CTRL, nand_ctrl | BAM_MODE_EN);
nandc_write(nandc, NAND_FLASH_CHIP_SELECT, DM_EN);