Look at the following page
https://freescale.sdlproducts.com/LiveContent/web/pub.xql?action=home&pub=LS2085A%20EAR%20v5.0%20-%2...
It is FAQ for NXP SDK. Find the following on this page:
How do I install the source code, modify it, and then and rebuild u-boot/kernel?
Have a great day,
Pavel Chubakov
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