Disable cores in Rpi 3 Model B

[ClaudiaWhite]

Hi,

I'm trying to disable the cores on Raspberry Pi 3 Model B, but to no avail.
The OS is Ubuntu MATE 16.04.

I've tried:
1) Editing /boot/cmdline.txt and add maxcpus=1
After that, I rebooted the Rpi, but it gave a blank screen. I couldn't boot into the OS.

2) Typing command below in terminal:
$ sudo -i
$ echo 0 > /sys/devices/system/cpu/online
However, I get "Permission denied".

Is there any ways to solve it?

Thank you.

[pepedog]

Example to try

Code: Select all

echo 0 > /sys/devices/system/cpu/cpu3/online

CPU0 can't be disabled

[ClaudiaWhite]

Hi,

Thanks for the reply, but no file named "online" in /sys/devices/system/cpu/cpu3

The only "online" file that I found is in /sys/devices/system/cpu/online


Is there a way to solve it?

Thank you.