Why does HPS EMAC MDIO not work when routed to FPGA IO on Agilex™ 5 designs?

Due to a problem in the Quartus™ Prime Pro Edition Software version 24.1, when routed to FPGA IO, the HPS EMAC MDIO does not work as expected for designs targeting Agilex™ 5 device.

You will be able to route MDIO to FPGA IO in Platform Designer and generate the design without errors, but the actual input and output will always be 0.

A patch is available to fix this problem for the Quartus® Prime Pro Edition Software version 24.1. Download and install Patch 0.19 from the following links:

• Quartus™ Prime Pro Edition Software v24.1 Patch 0.19 for Windows (.exe)
• Quartus™ Prime Pro Edition Software v24.1 Patch 0.19 for Linux (.run)
• Readme for Quartus™ Prime Pro Edition Software v24.1 Patch 0.19 (.txt)

This problem has been fixed in a future release of the Quartus™ Prime Pro Edition software version 24.2 and later versions..