##cat your sd card device: sudo fdisk -l you may see this: Partition table entries are not in disk order
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes
221 heads, 20 sectors/track, 3521 cylinders, total 15564800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 8192 15564799 7778304 b W95 FAT32
/dev/mmcblk0
is your sd device. make sure your sd format is FAT32
###downlaod uboot to your sd card:
donwlaod the webee210-uboot.bin
to the first block of your sd.
# cd ~/webee210v2
# sudo dd iflag=dsync oflag=dsync if=webee210-uboot.bin of=/dev/mmcblk0 seek=1
# sync