用创龙的OMAPL138-EVM开发板，想在u-boot烧写u-boot.ais到nand flash，无法从nand flash启动。用创龙提供的nand-write.out通过ccs烧写u-boot.ais后就能启动。但是查看hawkboard写着可以通过u-boot烧写u-boot.ais到nand flash，请问要怎么修改才能在u-boot烧写u-boot.ais到nand flash，然后能从nand flash启动？
hawkboard 在网上的烧写步骤是：
Procedure to flash u-boot on NAND
After booting the u-boot over UART as mentioned above,
- On the u-boot prompt in the terminal window
- Configure the Ethernet server and Client IP addresses, For e.g.
hawkboard.org > setenv serverip 172.24.156.199 hawkboard.org > setenv ipaddr 172.24.190.58
- Download the u-boot generated for NAND
hawkboard.org > tftpboot 0xc0700000 u-boot_nand_ais.bin
TFTP from server 172.24.156.199; our IP address is 172.24.190.58
Filename 'u-boot_nand_ais.bin'.
Load address: 0xc0700000
Loading: #################################################################
#################
done
Bytes transferred = 414988 (6550c hex)
- Erase NAND Flash
hawkboard.org > nand erase NAND erase: device 0 whole chip OK
- Flash the NAND with u-boot
hawkboard.org > nand write.e 0xc0700000 0x20000 0x70000
NAND write: device 0 offset 0x20000, size 0x70000 458752 bytes written: OK hawkboard.org >
- Switch off the board
- Change the DIP Switches for NAND boot 1-ON 2-OFF 3-OFF 4-OFF
