wellllllll, i think that 1.2GHz can fry the chip, not sure, but i think it might be true, the A8s are made to withstand 1Ghz speeds (the good samples).

for me, i will just go directly to 2Ghz and run windows 7 on it, heck why not, with enough human souls from this forums, i will go to 5GHz, yeah!

on the other hand, if you want to allow both 125MHz and 250Mhz, type this xterm:

echo > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/avoid_frequencies

if you want to avoid 125MHz, type this:

echo 125000 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/avoid_frequencies