board/beagleboneai/uEnv.txt

bootpart=0:1
bootdir=/
bootargs=console=ttyS0,115200n8 root=/dev/mmcblk0p2 ro rootwait
devtype=mmc
fdtfile=am5729-beagleboneai.dtb
uenvcmd=run loadimage; run loadfdt; printenv bootargs; bootz ${loadaddr} - ${fdtaddr}