I have tried using OpenCL in both Jack the Ripper and Hashcat. For JtR, it is partially functional for a single test. Hashcat can not even perform tests. Neither JtR nor Hashcat can analyze certain formats.
For example, with WPA-PSK, JtR spits out an error. Hashcat simply hangs until interrupted.
From what I gather, the runtime/driver may have been fine up until the released version. Hence, I am requesting an earlier verision of both rockchip-mali-midgard and rockchip-mali-midgard-dev.
Regardless, OpenCL on the Rock Pi is not properly implemented – and Radxa should promptly fix the runtime/drivers.