Are you sure about this? I just had a look at the datasheet for the STM32 and the PB12 - PB15 ports are accessable as SPI2…
Mmmm, second thoughts, the schematic (DSO203 v2.6) shows the SPI port on the FPGA connected to PB10 - PB13. Now that seems a bizzare oversight!
Is the schematic wrong, or did the HW designer really stuff up!