SPRZ457I January 2021 – December 2024 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
Boot: ROM timeout for MMCSD filesystem boot too long
Due to a bug in ROM if attempting to boot in SD/MMC boot (filesystem mode) from an eMMC device that is empty or erased (or factory fresh) the normal boot timeout to switch to backup boot mode will not occur as the boot gets stuck in an infinite loop until the watchdog timer reset kick in.
Need to boot from another primary boot mode to program the eMMC flash.