1SoCFPGA EPCS/EPCQx1 mini howto:
2- Instantiate EPCS/EPCQx1 Serial flash controller in QSys and rebuild
3- The controller base address is the "Base" in QSys + 0x400
4- Set MSEL[4:0]=10010 (AS Standard)
5- Load the bitstream into FPGA, enable bridges
6- Only then will the driver work
7