Tool/software:
I am having a similar issue while booting the J722S EVM from emmc SD card (even for the prebuilt SD card coming with the EVM). There are some errors showing while booting:
"...
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
Failed to load 'boot.scr'
574 bytes read in 32 ms (16.6 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc1 ...
## Error: "main_cpsw0_qsgmii_phyinit" not defined
19374592 bytes read in 802 ms (23 MiB/s)
..."
The full boot error log is as shown inf the following file.