Here is a working port of Kali Linux Rolling Edition with Kernel 4.5 for our Nokia N900 device.
This port is much more stable than my previous port, I have not faced any kernel panic errors, segmentation faults etc.
Everything that worked in my previous port should work in this port.

I have attached working kali-rolling rootfs image to this post along with installation instructions.

Installation instructions:

Step 1: Get a 8GB or more sized memory card.
Step 2: Extract 'kali-rolling.7z' file, it will give you 'kali-rolling.img' file.
Step 3: Insert your memory card to a linux system.
Step 4: Write the extracted 'kali-rolling.img' file to your sdcard (sudo dd if=/path to the extracted .img file/kali-rolling.img of=/dev/sdx bs=1M (here replace x with your sdcard device letter)).
Step 5: Install pali's U-Boot in your phone (Maemo).
Step 6: Copy 'configure_u-boot.sh' file to your phone memory, and run it as root user ('$ sudo gainroot' then '# ./configure_u-boot.sh').
Step 7: Insert your sdcard into your phone.
Step 8: Switch off and slide up your phone then switch on. And choose Kali-Rolling OS from the list.
Step 9: Configure your Kali OS on your first boot.
Step 10: Login with username 'user' and password with the password that you have specified during configuration.
Step 11: After everything works fine, shutdown your device and resize your sdcard's existing partition using any partition managing tool and you can add a 'swap' partition to your sdcard if you want.

Dowload link:
Kali Linux Rolling Edition for Nokia N900

I have built this using the official documentation from kali

I thank every person who put their effort on this device. Especially wicket, I have used his scripts for patching the kali's rootfs.

Hope you enjoy!

Reserved

Awesome! Kernel 4.5? Does this kernel support telephony?

good question.
telephony and audio were an issue if I remember when I was playing with the old version..
If it has no seg. faults... or panics.. or updating probs... etc..
I would hope it handles tele and audio...
crossing fingers to hear back from rapol the good news...

I have not yet tested telephony or audio, mostly the telephony will be supported by the kernel. Don't have enough time to test them

Just checked http://elinux.org/N900/Changelog
Seems to have speech since 4.1

Kernel 4.5 should support most of our device hardware, we need to find a way to use them.

Not sure - maybe this helps someone?
http://pavelmachek.livejournal.com/130784.html#comments

Thank you for the link..

I am trying installing it and I think everything went good until I typed my password, but now I only have a black screen with a blinking underscore on the top left. I have waited a bit just in case the first boot would be longer, but it has been more than 10 min now. Am I doing something wrong?