Hi chengzhi yan,
Which board are you using , is it the board i.MX51 Evaluation Kit you buy from NXP ? If yes, you can use the mfgtool in our website to write the images to the SD on your board. The Root File System for the Ubuntu Demo image you can download from our website. The link is :
i.MX51 Evaluation Kit|NXP . You can see it under the
Root File System for the Ubuntu Demo Image. ER 2010.11 for i.MX51. Engineering Release.
Hope this can help you.
Have a nice day.
Dan
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