Use single image for u-boot and Linux.
NXP LSDK 18.09 provides u-boot binary image and Linux itb file for the LS1046ARDB board.
Find the "How to add support for a new custom machine in flexbuild based on LSDK release" in LSDK 1809 documentation.
Use the following commands for .itb file:
bootm a0000000#ls1046ardb
Have a great day,
Pavel Chubakov
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