how can it boot zImage from sd card automatically and change zhe way of loading defaults, not in the way of tftp
There are actually two steps, first, boot the u-boot from SD card, we have never test this before, usually we boot u-boot from parallel or SPI Flash. Second is about reading the kernel image from a storage into RAM and start it from there, this is controlled by bootm command in u-boot command, it's set in u-boot env. run print in u-boot command line you see the details.
BOOT u-boot from SD card is only supported on BF609-ezkit.
Retrieving data ...