[meta-freescale] Copy u-boot to SD Card

[br jer]

I  am using Yocto master branch for wandboard build and need to do a minor
u-boot modification.

I have done the code change  and bitbake -c compile  u-boot-fslc

Then I copy the binary from the
 directory tmp/work/wandboard_solo-poky-linux-gnueabi/u-boot-fslc/v2013.10-r0/image/boot/.
to a SD card that has been booting well.

I use this command:
  sudo dd if=u-boot-wandboard-solo-v2013.10-r0.imx of=/dev/sdb bs=512
seek=2 skip=2

My sd Card cannot boot after that.  No message from the console.

Then I bitbake fsl-imge-test again.  The new sd Card image can now boot.
 What have I done wrong in copying the u-boot to the sdCard.

Thanks

Norman
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