On Thu, 22 Oct 2020 22:15:44 -0000 (UTC), Markus Robert Kessler
 declaimed the following:


>Sorry, forget to mention:
>
>Yes, I try to install Raspbian OS.
>
>Reason for asking all this, is, that once I saw a warning saying that
>installing newer Raspberry machines like "Rpi-Zero" will only be possible
>by using the most recent Raspbian versions. Older ones cannot do.
>
>So, it seems that there are indeed some differences regarding accessing
>the hardware architecture, but hopefully newer OS-es -- once installed --
>can serve older hardware like "RPI-A" as well.

 The 4B has a significantly different boot process, only supported with
the Raspbian based on Debian 10 (Buster). The foundation actually released
a Raspbian version some two weeks before Buster went official -- just
because the 4B had been released, and no earlier Raspbian would support its
boot.

 The 3B+, I believe, also required some additions to the boot system,
but I think that was still in the late Debian 9 (Stretch) period.

 ALL Raspbian releases contain the boot configuration files needed by
all Raspberry Pi models at the time of its release. The boot loader selects
the correct file once it determines which board it is running on. Just look
at all the bcm####*.dtb files in the FAT partition.


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