Yes, I configured the bootloader EEPROM with PSU_MAX_CURRENT (used both 5000 and 3000) but RPi5 still does not boot untill I press the power button.
I think that UPS provide enough current to boot in stable state, otherwise it would not boot at all.
Maybe you are right about the voltage rise time. What are the minimum values? Why there is such requirement for minimum rise time? Can I somehow configure the bootloader to skip that check or try to boot with time delay?
I also see that this UPS has capability to wake RPi via GPIO3 but RPi5 uses dedicated power button input (or J2) instead of that GPIO.
I think that UPS provide enough current to boot in stable state, otherwise it would not boot at all.
Maybe you are right about the voltage rise time. What are the minimum values? Why there is such requirement for minimum rise time? Can I somehow configure the bootloader to skip that check or try to boot with time delay?
I also see that this UPS has capability to wake RPi via GPIO3 but RPi5 uses dedicated power button input (or J2) instead of that GPIO.
Statistics: Posted by kajoje — Mon Dec 22, 2025 3:05 pm