Boot2Qt image for Jetson TX1 does not boot by default

file ~/Qt-test/5.9/Boot2Qt/jetson-tx1/images/b2qt-embedded-qt5-image-jetson-tx1.img
/home/kakoehne/Qt-test/5.9/Boot2Qt/jetson-tx1/images/b2qt-embedded-qt5-image-jetson-tx1.img: DOS/MBR boot sector

$ sudo fdisk /dev/mmcblk0

Welcome to fdisk (util-linux 2.28).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): g
Created a new GPT disklabel (GUID: 8A2869D7-D23D-47F6-913B-951656438518).

Command (m for help): n
Partition number (1-128, default 1): 
First sector (2048-31422430, default 2048): 
Last sector, +sectors or +size{K,M,G,T,P} (2048-31422430, default 31422430): +2800000

Created a new partition 1 of type 'Linux filesystem' and of size 1.3 GiB.

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

$ kpartx -a /home/kakoehne/Qt-test/5.9/Boot2Qt/jetson-tx1/images/b2qt-embedded-qt5-image-jetson-tx1.img 
device-mapper: table ioctl on loop5 failed: No such device or address
$ dd if=/dev/mapper/loop1p1 of=/dev/mmcblk0p1
2797568+0 records in
2797568+0 records out
1432354816 bytes (1.4 GB, 1.3 GiB) copied, 201.734 s, 7.1 MB/s