Is it possible to disable the A72?

[capablegh]

Hello.

Thank you for the reply! Even if it did not exactly answer the question as I posed, it helps towards the requirement indirectly. 

You mention that the A72 CPUs show up as 4 and 5 under Linux. Is this because on power-on RK3399 has the A53s as the first CPUs always? If so then somewhere at the start of the boot sequence (e.g. Trustzone BL1 or BL2 stages) I could ensure the A72s remain in reset all the way.

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Hi,
the easiest way is :

# get info
cat /proc/cpuinfo
# log root
sudo -s
#disable A72 (cpu 4 & 5)
echo 0 > /sys/devices/system/cpu/cpu4/online
echo 0 > /sys/devices/system/cpu/cpu5/online
# check (ctrl-c to quit)
htop
cat /proc/cpuinfo

to enable again replace 0 by 1

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oups I have not read that it should be from power on ! my method does not work then !