Re: Inconsistent results for checking whether the OS is 32 or 64 bit

On 2024-07-17, Theo wrote:

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?

That does seem to be the case.

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

"After updating 32 bit Raspi OS Pi 4 is on 64bit kernel" --- yes, that
would explain it.  Thanks!

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

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