On 25/10/2019 19:39, BIG Umberto wrote:
> In date: Fri, 25 Oct 2019 09:19:01 on group: comp.sys.raspberry-pi,
> druck wrote:
>
>> On 24/10/2019 21:13, ray carter wrote:
>>> Or you can do an in-place upgrade on the pi3 and then move to pi4. Just
>>> replace 'stretch' with 'buster' in you /etc/apt/sources.list then 'apt
>>> update' and 'apt dist-upgrade. It will take a while.
>>
>> You also need to follow that with an rpi-update otherwise the image will
>> not have the additional files needed to boot the 4B.
>
> Yes.
> The boot partition of pi4 is much large respect the pi3.

As my setup had been through many migrations between generations of Pi's
my boot partition wasn't big enough for the RPi 4B files, so I had
expand it to 256MB.

> Testing tomorrow for a hibrid mode: Boot of pi4 and second partition with
files of pi3.

You should be able put a Pi 4B Buster back in to a Pi 3B, as it contains
files for both.

---druck

--- SoupGate-Win32 v1.05