NXP offers SDK Linux BSP for the ls1021a-iot board:
https://www.nxp.com/webapp/Download?colCode=LS1021A-IOT-REV-B-SDK-0.4&appType=license&location=null&...
This SDK supports booting from NOR Flash, SD card and qspi.
What is msd bootloader do you mean?
Have a great day,
Pavel Chubakov
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