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From: Theo <theom+news@chiark.greenend.org.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Inconsistent results for checking whether the OS is 32 or 64 bit
Date: 17 Jul 2024 16:50:59 +0100 (BST)
Organization: University of Cambridge, England
Message-ID: <dCF*yOFPz@news.chiark.greenend.org.uk>
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Adam Funk <a24061@ducksburg.com> wrote:
> Hi
> 
> I have a Pi 4 B that I use headlessly over SSH. I can't remember
> whether I installed the 32-bit or 64-bit OS on it, but different
> commands found on the web give different results.
> 
> $ uname -m
> aarch64
> 
> $ getconf LONG_BIT
> 32
> 
> $ dpkg --print-architecture 
> armhf
> 
> Which one is right?

That sounds like a 32 bit OS on 64 bit hardware.  Not sure if uname -m is
the kernel or the hardware, but perhaps you're running a 32 bit userland on
a 64 bit kernel?

Seems that Pi OS switched to a 64 bit kernel on the Pi4 in March 2023:
https://github.com/raspberrypi/firmware/issues/1795

It looks like 'getconf' returns glibc parameters, which would be 32 bit on a
32 bit userland.

Theo