Support for Squeeze ended 3 years ago (5 if you consider, that LTS does not cover anything beyond x86). Is there a reason why you don't use a more recent release?
If you still want to chroot into the system from Maemo, then you should be able to use Jessie after patching glibc. [1] I can provide you patched packages.
If you don't care for chroot, I'd suggest to go straight to to Buster.

You may also want to consider contacting @wicket, who ran a pretty similar project called DebiaN900, but abandoned it in favor of the Maemo Leste project, which you should have a look at.

btw: The N900 supports armhf, it's just Nokia's stock kernel for Fremantle that doesn't - "kernel power" does.


[1] https://talk.maemo.org/showpost.php?...postcount=3138