[ De1-soc ] Helping me with a problem about HPS DMA example

Hm, I would like to try it out myself but right now I do not have ARM license that allows me to perform baremetal debug over USB Blaster II...

But since the example uses the u-boot-spl.axf file from SOCEDS during compilation (this u-boot-spl.axf file is built using the GHRD meant for the CV dev kit, not DE1-SoC) I would recommend trying to re-generate the u-boot-spl.axf (if you haven't) using the hardware handoff files for DE1-SoC. Or, you can copy one from one of Terasic's design example.

Another thing to check is that there is no Quartus Programmer/System Console that is running on the background - sometimes this will hinder with the debugging since they are using the same JTAG resource. Also, remove the SD card (if any) from the its slot.