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Different raspberry pi 4 and 3 on same SD card


edmundwatson@...
 

Hello,

I am trying to build a image that work on a raspberry pi 3 and 4.

Does anyone know a way of doing this?

I have tryied copying over bcm2710-rpi-3-b.dtb kernel7.img (the RPi3 kernel) over to  raspberry pi 4  image boot partition
I get a blank screen however.

Thanks

Ed Watson