Hi
one can post on uboot mail list
U-Boot Info Page
You are right, freescale u-boot version is different from mainline,
which has a more configs, also it does not support spl.
In general may be useful also to look at
https://community.freescale.com/message/402940#402940
NXP software is documented on :
i.MX 6 / i.MX 7 Series Software and Development Tool|NXP
Best regards
igor
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