This still uses the SDRAM interface designed for the MiSTer. If you get errors around the 100mhz range it does not indicate a problem with your Pocket, it just highlights which frequencies are incompatible with the MiSTer FPGA implementation.
Port of the MiSTer SDRAM Tester to the Analogue Pocket
Port of the MiSTer SDRAM tester.
Original is here https://github.com/MiSTer-devel/MemTest_MiSTer/tree/master
Up/Down changes speed
Right turn on auto mode
Left turn on auto mode