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Dear Fai,
you shouldn't expect to get an answer for such a broad question here. The TI Linux forums are really there to help and discuss issues with our Linux packages, drivers and other software that is related to TI devices. Generic board or Linux usage questions are better to placed in outside forums such as the BeagleBoard forum. You might also try Angstroem/OpenEmbedded forums as your question is related to their build tools.
Regards.