I am using a Pi4 4GB as a controller for my 3D printer using Klipper.
The Pi4 is powered by a 5V 5A power supply. Connected to the Pi4 via USB is a tool head board (LDO Nitehawk36) which uses a RP2040 as an additional MCU.
My problem is that the Pi4 will not boot when the RP2040 is connected. I just get a solid red power light with no activity. As soon as I unplug the 2040 board the activity light comes on and the system boots fine. I can plug the 2040 board back in at this point and everything is absolutely fine.
But this isn't something I can do every time I switch it on.
Does anyone have any ideas why having the RP2040 connected would prevent the Pi4 from booting? Any solutions I can try?
The Pi4 is powered by a 5V 5A power supply. Connected to the Pi4 via USB is a tool head board (LDO Nitehawk36) which uses a RP2040 as an additional MCU.
My problem is that the Pi4 will not boot when the RP2040 is connected. I just get a solid red power light with no activity. As soon as I unplug the 2040 board the activity light comes on and the system boots fine. I can plug the 2040 board back in at this point and everything is absolutely fine.
But this isn't something I can do every time I switch it on.
Does anyone have any ideas why having the RP2040 connected would prevent the Pi4 from booting? Any solutions I can try?
Statistics: Posted by MrMeatbeard — Fri Aug 29, 2025 3:11 pm — Replies 2 — Views 75