Our quartus version is 19.3. The work frequency of Nios is 300M Hz. If we want to debug nios software, we need to change the default settings.
Nios 2->BSP->Editor->Settings->Advanced->hal->linker, then uncheck"allow_code_at_reset" and "enable_alt_load".
After the setting modification is finnished, re-build project and debug it as Nios 2 hardware. Then the software always shows a prompt that connected system ID has not found on target at expected base address. Please help to give some possible reason for that.