The LS1046ARDB board does not support NAND booting.
The LS1046ARDB supports SD and QSPI boot source.
See the SW5 switch setting in the LS1046ARDB Reference Manual.
See also the Section 4.4.8.2 of NXP SDK 2.0-1703 documentation:
https://www.nxp.com/docs/en/supporting-information/QORIQ-SDK-2.0-IC-REV0.pdf
Have a great day,
Pavel Chubakov
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