Sorry missed that part about Android I am using that VFD because that was what was asked. Report about Amlogic S905X4 HK1 RBOX X4 - #304 by Betatester
Running as normal and su there is no /sys/kernel/debug.
Android dmesg shows /sys/module/aml_fd655 for vfdsrv if that helps. Seems consistent with comments here GitHub - hkallweit/linux-amlogic-sc2 at sc2 Maybe the source there is needed?