www.d
fi
.com
Appendix A BSP User Guide
34
Appendix A
When a MMC/SD or eMMC device is ready for Android system boot, you can power on the
board to setup the u-boot environment for loading the kernel/ramdisk from the device by
pressing any key to enter.
On the u-boot shell:
U-Boot > setenv ethaddr 00:04:9f:00:ea:d3 [setup the MAC address]
U-Boot > setenv fec_addr 00:04:9f:00:ea:d3 [setup the MAC address]
U-Boot > setenv loadaddr <kernel load addr> [0x90800000 for i.MX51, 0x70800000 for
i.MX50/3]
U-Boot > setenv rd_loadaddr <ramdisk load addr> [0x90D00000 for i.MX51, 0x70D00000
for i.MX50/3]
U-Boot > setenv bootcmd 'run bootcmd_eMMC; bootm ${loadaddr} ${rd_loadaddr}'
U-Boot > setenv bootcmd_eMMC 'mmc read 1 ${loadaddr} 0x800 0x2000; mmc read 1
${rd_loadaddr} 0x3000 0x300;' [load kernel and ramdisk from MMC/SD or eMMC]
[About the SD boot, please use the "mmc read 0" replace the "mmc read 1"]
U-Boot > setenv bootargs <SD/MMC bootargs> [For different platforms, please refer to
below table]
U-Boot > saveenv [Save the environments]
