how to use separated the FPGA configuration and HPS booting?

yes, when the FPGA is powered or reset, i want the HPS boot right after the FPGA have been configured, you are right.

From your description, we got below points.

1. Early IO release feature must be disabled in Quartus.

2. No other singal need to be set/control.

3. this feature is tested on latest U-boot.

these are the information we need.

and i have two more question,

1. you mentioned that the HPS can be in a loop to wait the FPGA configuration done, what step that the loop locates? in the boot ROM? or uboot-SPL?

2. we are now using the U-Boot 2021.04, is this version support the feature?

we will test it soon.

thank you.