I got a user asking about having issues getting OpenChrome to work properly on Debian 9. The thing is, since Linux 4.5 kernel, vesafb, viafb, and vt8623fb frame buffer device drivers conflict with OpenChrome DDX, hence, they need to be blacklisted. In order to do this, you need to edit blacklist-framebuffer.conf configuration file located under /etc/modprobe.d/ as a root.
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Remove # before blacklist to blacklist the device driver. Do this for vesafb, viafb, and even vt8623fb. Reboot the computer and OpenChrome should be working.