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PROCESSOR-SDK-AM57X: /dev/rpmsg-dce not instantiated

Part Number: PROCESSOR-SDK-AM57X

Hello, all.

Trying to run gstreamer on my EVM with SDK-8.0.

I am having the same problem (/dev/rpmsg-dce not instantiated) as in:
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/845540/processor-sdk-am57x-dev-rpmsg-dce-not-instantiated

But:
i have one DTB and one kernel from SDK-6.0 which runs. IMHO, this means that my file system content is OK, all the xem4 files are correct, etc

Any attempt to change something to SDK-8.0 fails with this problem of rpmsg-dce.

I tried pre-built DTB+pre-built kernel, any combination of working DTB/kernel with 8.0 dtb/kernel - no success.

Can somebody shed some light on this mysterious device and how to force its creation?

Many many many thanks ahead.