AM3703 Chip select 7 for nand accessing through U-boot source code

Hello ALL,

                   Can any one tell , what are the changes need to be made in u-boot source code for accessing nand , which is connected to GPMC_CS7.

In u-boot , nand_base.c file, nand_flash_dev function , where we are chip selecting with function,

chip->select_chip (mtd, 0);

How to select for chip select 7 for above function.

After that passing READ_ID command to get the flash device manufacture Id and device Id.

Thanks in Advance!!!!