Why does the FPGA to HPS bridge address width dropdown in the Hard Processor System Intel® Stratix® 10 FPGA IP allow for up to 40-bit addressing?

Description

The Bridge Address width dropdown in the FPGA to HPS slave interface section of the HPS FPGA AXI Bridges section on the FPGA Interfaces tab of the Hard Processor System Intel® Stratix® 10 FPGA IP allows selections of up to 40-bit addressing.  However, the HPS address map as visible from the FPGA is only 128GB or 37 bits.

Resolution

In the Intel® Stratix® 10 HPS interconnect, the high-order bits are available but ignored.  Masters accessing this bridge should not use these bits.

This problem is fixed starting with the Intel® Quartus® Prime Pro/Standard Edition Software version 20.1.