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From: Adam Funk <a24061@ducksburg.com>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Inconsistent results for checking whether the OS is 32 or 64 bit
Date: Mon, 22 Jul 2024 14:27:57 +0100
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On 2024-07-22, Theo wrote:

> Adam Funk <a24061@ducksburg.com> wrote:
>> I'm starting to wonder if I just moved the SD card and external USB
>> drive from a 2 to a 4B when I got the 4B and kept upgrading. Would
>> that explain this situation?
>
> It looks like it was changed in an update.  I think the Pi maintains
> multiple kernels in /boot, so it's possible the same SD card will boot with
> a 64-bit kernel on a Pi4 and 32-bit kernel on a Pi2 (especially the v1.0 Pi2
> with a Cortex A7 which doesn't support 64 bit).

Right.


> So it may not be that moving the card has affected it, just that the single
> '32 bit' Pi OS boots a different kernel depending on which hardware you put
> the card into.

Well, if I had done a fresh install on a 4B, I would have picked the
64-bit option, so the 32-bit userland is a vestige of that.


> (this has caused some troubles for build systems which use uname -m to work
> out whether to build 32 or 64: it returns 64, but the right answer is 32. 
> The same would happen with a 32 bit chroot on a 64 bit x86)

Ouch. Fortunately I haven't run into that.


-- 
With the breakdown of the medieval system, the gods of chaos, lunacy,
and bad taste gained ascendancy.                ---Ignatius J Reilly