How to push up to maximum frequency.

[jzhang18]

Hostname: rockpro64
CPU Frequency:
Core0: 1416Mhz
Core1: 1416Mhz
Core2: 1416Mhz
Core3: 1416Mhz
Core4: 1800Mhz
Core5: 1800Mhz
CPU Governor: performance
Temperature: 40  C

I am wondering how I can push 4 LITTLE cores to 1.5Ghz and 2 big cores to 2.0Ghz.

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For Banana PI M3, there is a file called sys_config.fex, has content like:
B_LV3_freq = 1608000000
B_LV3_volt = 920

B_LV4_freq = 1200000000
B_LV4_volt = 840

B_LV5_freq = 0
B_LV5_volt = 840

B_LV6_freq = 0
B_LV6_volt = 840

B_LV7_freq = 0
B_LV7_volt = 840

B_LV8_freq = 0
B_LV8_volt = 840

[vf_table1]

I am thinking if there is similar file in rockpro64, so I can tune it by myself to unlock 2.0Ghz/1.5Ghz

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BTW - I have a good power supply 12V/6A, full height heat sink, and a good cooling fan running on top of the sink. want to unlock the potential of RK3399 CPU