I am trying to modify U-Boot these days. But for l4t R28.1 I can not flash U-Boot only with this command:
sudo ./flash.sh -k EBT jetson-tx1 mmcblk0p1
The log shows that flashed successfully, but the result did not change. And when I flashed the full l4t, the U-Boot result changed, the command is:
sudo ./flash.sh jetson-tx1 mmcblk0p1
Besides, when I used l4t R24.2.1, I can flash U-Boot only with that command.