On 07/09/2020 18:45, Brian Gregory wrote:
> On 07/09/2020 14:38, druck wrote:
>> You shouldn't need to, I upgraded my whole dozen strong collection
>> including every generation of Raspberry Pi, from Stretch to Buster,
>> and didn't loose any of them.
>>
>> When promoting a card to a later machine, I've occasionally found a
>> newer kernel and startX.elf isn't present, using rpi-update on the
>> older machine before moving the card fixes that.
>
> I found the boot partition was too small for all the latest raspberry pi
> 4 stuff when I upgraded my Raspberry pi 2 to Buster.
> It runs Raspberry pi 2 compatible buster fine though, just doesn't have
> all the latest boot files for the raspberry pi 4, which doesn't really
> matter in my case since it's just a very low traffic web server that can
> stay on the Raspberry Pi 2 for now.

Good point, I'd forgotten about that. All my old cards only had a 64MB
boot partition, but when the Pi 3 came out I followed recommendation to
change it to 256MB. Even if the normal contents of boot is quite small,
it uses about twice the space during an update.

I repartitioned most of my cards at that point, but only finished off
the process for the Pi Zeros, 1s and 2s more recently to make everything
consistent. This involved repartitioning my backup images on the NAS
too, but the process is the same.

> Actually I think it would boot on a Pi 4, it just doesn't have the
> latest power optimization stuff.

Pi 4 does need its own version of just about every file in boot, so
don't try it with an old 64MB partition.

---druck

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