I've just re-flashed my N900.
I've seen the wiki: http://wiki.maemo.org/Root_access
I've already instaled roothsh.

My problem is:
Before reflash, i easly can do:
sudo echo 900000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

now, it says access denyed.

If i do: sudo /usr/sbin/kernel-load
It prompt for password :S help please