[Build own dts file for cora-z7-10]

Hello,

I'm trying to build my on dts file for the cora-z7-10 and have use the system.hdf file from Digilent / Petalinux-Cora-Z7-10

https://github.com/Digilent/Petalinux-Cora-Z7-10/tree/master/Cora-Z7-10/project-spec/hw-description

and follow the construction from the Xilinx page

https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842279/Build+Device+Tree+Blob

I get a dts abut the dts does not work

Did I forgot something?

I want to creat my own u-boot image and boot the coara-z7-10 because I want to run a RTEMS application.

Have any one experience to run RTEMS in Cora-Z7-10 ?

Thank You