# You can either hardcode your fdtfile or use some sort of test
# like I did here with findfdtfile.
# If you do not provide an uEnv.txt, then am335x-boneblack.dtb
# will be the default. (Hard coded in u-boot).
# U-Boot always sees the emmc as the second mmc device (mmc 1),
# hence bootpart=1:2
# When booting from the emmc, Linux will see it as /dev/mmcblk0,
# hence mmcroot=/dev/mmcblk0p2
bootpart=1:2
bootdir=/boot
bootfile=zImage
console=ttyO0,115200n8
fdtaddr=0x88000000
fdtfile=bbb-hdmi.dtb
loadaddr=0x82000000
mmcroot=/dev/mmcblk0p2 ro
mmcrootfstype=ext4 rootwait
optargs=consoleblank=0
nohdmi=bbb-nohdmi.dtb
mmcargs=setenv bootargs console=${console} ${optargs} root=${mmcroot} rootfstype=${mmcrootfstype}
findfdtfile=if test -e mmc ${bootpart} ${bootdir}/nohdmi; then setenv fdtfile ${nohdmi}; fi;
loadfdt=run findfdtfile; load mmc ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}
loadimage=load mmc ${bootpart} ${loadaddr} ${bootdir}/${bootfile}
uenvcmd=if run loadfdt; then echo Loaded ${fdtfile}; if run loadimage; then run mmcargs; bootz ${loadaddr} - ${fdtaddr}; fi; fi;