Snakeoil 1.4.0 (High End)

[hkphantomgtr]

Thanks. I'd found that page. And tried substituting the official RPi 5 PSU for my Linear PSU, but no joy 

There is also a YouTube video where the guy shows a way to override the Ubuntu error message on boot supposedly to allow the machine to boot. I haven't tried that, but perhaps I should.

It was a pain to get a power supply that the Pi5 recognises as 5V, 5A. Failed with super duper Gaan USB charger with 65W and Dell laptop 45W charger. Best to attach monitor to see what is happening. It will give you a message to press the power button to temporarily bypass this restriction, and also what to change in config file for permanent bypass.

Was not expecting a SQ difference, but the USB boot is better than microSD!     Brought it back closer to the NUC. So may have to start looking for a new LPS

Are you powering Pi5 thru USB C？ If so, in my understanding (I've searched a lot in internet last two months), the simplest way is to buy the original Pi 5 power supply.  Most of the USB switching power supply in the consumer market are not able to output more than 3A/4A in 5V.  

If you are powering pi5 thru GPIO, then you need to modify the /boot/firmware/boot.txt to let Pi 5 knows that, the incoming power supply can be more than 3A.  Or no matter how strong your power supply to GPIO, Pi 5 just keeps warning you for not enough power.  Then it slows down itself and limits the current output to those peripherals.  That will be very obvious if one boot into a desktop OS, e.g. Raspberry Pi OS, Ubuntu OS.  Everything will take very long time to load and they are slow.

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Confirming my Pi5 has 2 blue  USB ports and they are the bootable USB ports.  One more thing to consider.  The Pi5 expects 5V 5A when booting from USB (but this can be overwritten temporarily during boot or permanently in config file).  This may help:

https://bret.dk/usb-boot-on-the-raspberry-pi-5/

Thanks. I'd found that page. And tried substituting the official RPi 5 PSU for my Linear PSU, but no joy 

There is also a YouTube video where the guy shows a way to override the Ubuntu error message on boot supposedly to allow the machine to boot. I haven't tried that, but perhaps I should.

For the LPSU, did you modify the /boot/firmware/config.txt? 
Misc. sharing for building Raspberry Pi 5 as music server