If the RPI3 has 'Buster' installed then you need to update and upgrade the SD card then move it to the RPi4.MuntyScruntfundle wrote: ↑Wed Jan 15, 2020 7:08 pmHi there.
I have a bunch of pi3s which are all powered from pin 2 and 3 (I think) on the header, and I've just received a couple of 4s to try. I have buster flashed to a known good 32gb card, but I can't get either 4 to do anything.
I plug the power in, get a couple of tiny flashes from the green led, then nothing. I've just hooked them up via the hdmi to see what's going on, nothing.
Is there anything physically different about these things I should know about? I know the power requirement is slightly different, but I know I'm providing enough millis. Do I have to tell it I'm providing power to the header? Any card restrictions? I had assumed they'd run with the same stuff plugged in.
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sudo apt update sudo apt upgrade
No, no and yes.
IIRC, there are three stages and associated mechanisms within the boot process during which (processed) edid-data from the display via the HDMI connection is passed into and from which a display "setting" is generated. It could be that your display (what is it?) is using some peculiar or (literally) odd clock timings which cause the latter stage(s) to fail. Assuming you can enable SSH (via the dummy ssh text file mechanism**) and have a wired or wireless network connection (the latter can be setup by a similar method to SSH) can you login to the partially booted P4 and post the output of these tvservice commands which may give us some clues:MuntyScruntfundle wrote: ↑Wed Jan 15, 2020 8:49 pmHmm, spoke a little too soon.
With HDMI connected to either port I get the 4 raspberries, a very brief flash of a white panel with a raspberry on it, then the display dies.
The disk light continues to flash away for a couple of seconds, so I'm pretty sure it's booting, but the monitor output is getting cut.
I haven't seen any posts on this, so now I'm stumped. Unless this is the boot problem, I'll try the prom again, but I doubt that will do much.
Any other ideas?
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tvservice -n tvservice -m DMT tvservice -m CEA tvservice -s