Corrupted test marker with u-boot and zynq

[Jan.Sommer at dlr.de]

Hello,

I try to create a setup to run the rtems testsuite on a Xilinx Zynq device with u-boot.
I built everything with the 5.0.0-m2006-2 pre-release.
It now works in general, but quite a number of tests have a corrupted begin test marker (see below).
This way, rtems-test does not recognize the test and counts it as timeout.
The value of wrong characters is the same for multiple runs of the same test, but is different for different tests (or not present at all).

If I execute the elf file via JTAG, everything works fine. 
Has someone encountered such behavior before?
Looks like the something is going wrong during the handover from u-boot to rtems.

> Load address: 0x10000000
> Loading: ###
>          2.9 MiB/s
> done
> Bytes transferred = 39140 (98e4 hex)
> ## Booting kernel from Legacy Image at 10000000 ...
>    Image Name:   RTEMS
>    Image Type:   ARM RTEMS Kernel Image (gzip compressed)
>    Data Size:    39076 Bytes = 38.2 KiB
>    Load Address: 00104000
>    Entry Point:  00104000
>    Verifying Checksum ... OK
>    Uncompressing Kernel Image ... OK
> CC** BEGIN OF TEST SP 16 ***
> *** TEST VERSION: 5.0.0-m2006-2
> *** TEST STATE: EXPECTED_PASS
> *** TEST BUILD: RTEMS_POSIX_API

Best regards,

   Jan