How do I route I2C_EMAC ports to the FPGA without EMAC modules in Qsys?

To work around this problem, open the Qsys project file (.qsys) in a text editor and find the lines below.

  <parameter name="I2CEMAC0_Mode" value="N/A" />
  <parameter name="I2CEMAC0_PinMuxing" value="Unused" />
  <parameter name="I2CEMAC1_Mode" value="N/A" />
  <parameter name="I2CEMAC1_PinMuxing" value="Unused" />
  <parameter name="I2CEMAC2_Mode" value="N/A" />
  <parameter name="I2CEMAC2_PinMuxing" value="Unused" />

Then edit the lines of I2C_EMAC you want to route to the FPGA like below. In this case only I2C_EMAC0 and I2C_EMAC1 are routed to the FPGA.

  <parameter name="I2CEMAC0_Mode" value="default" />
  <parameter name="I2CEMAC0_PinMuxing" value="FPGA" />
  <parameter name="I2CEMAC1_Mode" value="default" />
  <parameter name="I2CEMAC1_PinMuxing" value="FPGA" />
  <parameter name="I2CEMAC2_Mode" value="N/A" />
  <parameter name="I2CEMAC2_PinMuxing" value="Unused" />

Open your qsys file and you can find I2C_EMAC I/O in the HPS module. Make sure that once you open the HPS parameters window and edit any pin settings, the settings above may disappear.

This problem is scheduled to be fixed in a future release of the Quartus II software.