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STM32NP157D Discovery Kit Getting Started: Kernel rebuild example hangs: ERROR: reserving fdt memory region failed (addr=d4000000 size=4000000) Any ideas?

RTjep.1
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I am evaluating the STM32NP157D Discovery Kit.

In the Getting Started Section I have successfully done the gtk_hello_world step.

The next step successfully rebuilds the kernel. After pushing it on the board I do the reboot and get the following Error message during booting:

# Booting kernel from Legacy Image at c2000000 ...                            

  Image Name:  Linux-5.10.61                                                 

  Created:     2022-01-23 13:24:54 UTC                                      

  Image Type:  ARM Linux Kernel Image (uncompressed)                         

  Data Size:   7465256 Bytes = 7.1 MiB                                       

  Load Address: c2000040                                                      

  Entry Point: c2000040                                                      

  Verifying Checksum ... OK                                                   

## Flattened Device Tree blob at c4000000                                      

  Booting using the fdt blob at 0xc4000000                                    

  XIP Kernel Image                                                            

ERROR: reserving fdt memory region failed (addr=d4000000 size=4000000)         

  Using Device Tree in place at c4000000, end c401efa2                        

Starting kernel ... 

Now the system hangs.....

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