When powering my RPI5 with the a standard power supply over USB-C it boots directly, but when I power it over 5V GPIO, the only visible reaction is the red LED turning on and staying on (no boot). When I press the power button it starts booting and working fine.
I have read the power supply requirements, and the one I'm using can deliver well more than 25W.
Not sure what the cause of this issue is, and how to solve it.
Reading the forum, there seems to be much attention on the power button, but the only similar problem I found was in this post which I'm trying to revive now.
Can it be that there is a timing requirement on how fast the power supply ramps up the voltage?
Do you know any solutions or workarounds?
An untested hypothesis...
Perhaps the firmware only has the ability to check the power supply connected to the usb-c power connector? Perhaps in the absence of information from that port confirming that the power supply is adequate it acts defensively and asks for user confirmation to proceed? Information from the default console on the dedicated serial 'debug' port might be helpful to confirm this.
The behaviour you describe matches what I see if I attempt to boot from a usb mass storage device with a competent, but 'dumb' (ie. non-PD), 5 volt usb-c power supply.
Have you tried the "I know what I am doing and my dumb PSU is working fine, just boot anyway" entry in /boot/firmware/config.txt?
See Powering Raspberry Pi 5 https://www.raspberrypi.com/documentati ... berry-pi-5 for details.
Statistics: Posted by B.Goode — Wed Jan 31, 2024 10:00 am