uEnv.txt for CTAG image, place in /uEnv.txt

uEnv.txt

uenvcmd=echo loading am335x-bonegreen-ctag-face.dtb; load mmc ${mmcid}:1 ${fdtaddr} boot/dtbs/${uname_r}/am335x-bonegreen-ctag-face.dtb; if env exists uboot_overlay_addr0; then setenv overlay ${uboot_overlay_addr0}; run bela_loadoverlay; fi; if env exists uboot_overlay_addr1; then setenv overlay ${uboot_overlay_addr1}; run bela_loadoverlay; fi; if env exists uboot_overlay_addr2; then setenv overlay ${uboot_overlay_addr2}; run bela_loadoverlay; fi; if env exists uboot_overlay_addr3; then setenv overlay ${uboot_overlay_addr3}; run bela_loadoverlay; fi; if env exists uboot_overlay_addr4; then setenv overlay ${uboot_overlay_addr4}; run bela_loadoverlay; fi; if env exists uboot_overlay_addr5; then setenv overlay ${uboot_overlay_addr5}; run bela_loadoverlay; fi; if env exists uboot_overlay_addr6; then setenv overlay ${uboot_overlay_addr6}; run bela_loadoverlay; fi; if env exists uboot_overlay_addr7; then setenv overlay ${uboot_overlay_addr7}; run bela_loadoverlay; fi; load mmc ${mmcid}:1 ${loadaddr} /boot/vmlinuz-${uname_r}; setenv bootargs console=${console} root=/dev/mmcblk${mmcid}p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet; bootz ${loadaddr} - ${fdtaddr};
bela_loadoverlay=echo loading ${overlay}; load mmc ${mmcid}:1 ${rdaddr} ${overlay}; fdt addr $fdtaddr; fdt resize 0x60000; fdt apply ${rdaddr}; fdt resize 0x60000;

#uboot_overlay_addr1=/lib/firmware/<xxx>.dtbo
# add more uboot_overlay_addrX here, with X comprised between 0 and 7 (see command above).

console=ttyS0,115200n8
uname_r=4.4.62+
mmcid=0