dev_cmd_reg_addr
first = dev_cmd_reg_addr(nandc, first);
first = dev_cmd_reg_addr(nandc, NAND_DEV_CMD1);
first = dev_cmd_reg_addr(nandc, NAND_DEV_CMD_VLD);
nandc_write(nandc, dev_cmd_reg_addr(nandc, NAND_DEV_CMD_VLD),
nandc->cmd1 = nandc_read(nandc, dev_cmd_reg_addr(nandc, NAND_DEV_CMD1));