new PPC Questions

Dear sir,
    Today I 'd like to ask you a question like this:

AfterI ported a image into the board,when I used the
following commmand

   => bootm 10020000

to boot that image,the message just like the one
listed below was displayed.

   => # Booting  Linux kernel at 10020000
   =>  Bad Header Checksum

    I think,the reason for this has something to do
with the way I compile the image. What do you think?
Please give a hint.Thank you!

      Best Regards
                    Yours sincerely Micael Balow


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