Prior to rebuilding the kernel and checking overclock limits I thought it would be useful to see how the default kernel clocks are setup
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root@odroid64:/sys/devices/system/cpu/cpufreq# cat all_time_in_state
freq cpu0 cpu1 cpu2 cpu3
100000 0 0 0 0
250000 0 0 0 0
500000 0 0 0 0
1000000 0 0 0 0
1296000 0 0 0 0
1536000 0 0 0 0
1752000 0 0 0 0
2016000 815556 815556 815556 815556
Let's check what the governor is
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root@odroid64:/sys/devices/system/cpu# cd cpu0/cpufreq/
root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_cur_freq
2016000
root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_max_freq
2016000
root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# cat cpuinfo_min_freq
100000
root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_available_frequencies
100000 250000 500000 1000000 1296000 1536000 1752000 2016000
root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_available_governors
hotplug performance
root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_governor
performance
Lets set it up to hotplug for the governor
root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# echo hotplug > scaling_governor
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root@odroid64:/sys/devices/system/cpu/cpu0/cpufreq# cat /sys/devices/system/cpu/cpufreq/all_time_in_state
freq cpu0 cpu1 cpu2 cpu3
100000 0 0 0 0
250000 1906 1906 1906 1906
500000 10 10 10 10
1000000 10 10 10 10
1296000 0 0 0 0
1536000 0 0 0 0
1752000 0 0 0 0
2016000 848828 848828 848828 848828
Next up, figure out how to overclock and find the C2 limits