Are my eyes fooled, or is there a N900 install image for Devuan?

Has anybody used it? What's it like? How hard is it to install?

yes there is
it works pretty well. command line only for now, as far as i know. i've not had the time to play with it yet. if you want more info, join IRC - freenode/#maemo and ask

I see N900 image in Devuan downloads but don't know how to use this. Search in irc log not contain answer.
Is it using like Easy-debian?

no. you need to boot into it instead of maemo. you can either use uboot to do this, or load the kernel via flasher

for u-boot select u-boot console then type run sdboot.
username/password: root/toor

I couldnot get wifi too work, despite copying wl1251-fw.bin and wl1251-nvs.bin to /lib/firmware/ti-connectivity, i cant connect to my network.

Device shows up, syslog messages are
wl1251: loaded
wl1251: initialized

"iwlist wlan0 scan" lists all networks

i set up /etc/network/interfaces
ifup wlan0

dhcp forever, iwconfig no values set..

ESSID: off/any
AP: Not-Associated

dmesg:
wl1251: firmware booted (Rev 4.0.4.3.7)

I tried to create a script setting some values like (ESSID) via iwconfig (which seems to work), but failed to connect.

(It is the same in my wickets 4.1 config, maybe i should try conman)

Maybe someone has already found a way to get it work?

I had xfce installed, and for sure it worked from wicd, though I had to change some setting to make it use something newer (sorry, can't remember now what it was ).

What definitely works from console is wpa_supplicant, though iirc you should use nl80211 driver, not wext. Could be the same that had to be changed in wicd.

nice!

nl80211 is working for me, dispite errormsg
rfkill: Cannot open RFKILL control device

(-Dwext not)

for completeness:

wpa_passphrase MYSSID passphrase > /etc/wpa_supplicant/example.conf

wpa_supplicant -B -i wlan0 -Dnl80211 -c /etc/wpa_supplicant/example.conf

dhclient wlan0