Forgot to mention, support for the EERAM was added after the Stretch 6/2020 image was released. My former colleagues at Kunbus haven't pushed a new release of the raspberrypi-kernel package to the apt-repository since then. Until they do that, you need to build your own kernel with kernelbakery
. Sorry for the inconvenience.
My recollection is that no driver changes were necessary to bring up the EERAM. Only the devicetree overlay had to be amended. So it may be sufficient to just swap /boot/overlay/revpi-compact.dtbo with an updated version. For some reason the devicetree overlay on the official revpi-4.19
branch does not contain the requisite changes. Not sure what went wrong there, perhaps someone destroyed them. I still have the changes locally in my git repo and pushed them to a new revpi-4.19-compact