Thanks for your response.
I am sorry, I thought that is what meta-freescale for, right? NXP might involve the coding, but is it integrated and released by Yocto / OE https://git.yoctoproject.org/cgit/cgit.cgi/meta-freescale/, right? I cloned meta-freescale from Yocto project: git://git.yoctoproject.org/meta-freescale, I am sorry, I really lost.