Can't Modify U-Boot Environment Variables on Updated Firmware
Fragment of a discussion from Talk:R-Car/Boards/Yocto-Gen3
Yes, /tmp/deploy/images/h3ulcb is correct path. Please refer to the No13 of http://elinux.org/R-Car/Boards/Yocto-Gen3#Building_the_BSP_for_Renesas_H3ULCB.2C_M3ULCB.
All updating methods are described below. http://elinux.org/R-Car/Boards/H3SK#Flashing_firmware Could you try again?
If "u-boot" still doesn't start up please attach the log when flashing the firmware.
Rebuilding the whole thing from scratch worked. Something must have gone wrong in the initial build because the .dtb file sizes between the two builds were off by a few hundred bytes.