Hi Brian
So you are saying that if you use Altera U-Boot from 2025.01 and 2025.04 branches in Cyclone V, there is no output from the serial console similarly to what is being reported in the Agilex 5 Modular dev kit when using latest branch in Das U-Boot repo?
If this is the case, I think that for Cyclone V this shouldn't be a surprise, since the latest code validated for Cyclone V uses the QPDS24.1STD_REL_GSRD_PR tag in Altera Repos as it can be seen in https://altera-fpga.github.io/rel-25.1/embedded-designs/cyclone-v/sx/soc/gsrd/ug-gsrd-cve-soc/#source-code
Cyclone V is aligned with Quartus STD releases, which occur only once a year, so it is not expected to work with U-Boot branches 2025.01 or 2025.04.
In the case of Modular Dev Kit, this should work with Altera U-Boot branches from 2025.01 and 2025.04, but since not all the updates in the Altera repos have been pushed to the Das U-Boot repo, it possible to observe this issue, so that's why we recommend to use the Altera repo content.
Thanks
Rolando