Kernel default frequency scaling governor

[agongon]

Hi all, not quite sure if this is the place to post this.

I've got my beaglebone black a few days ago. I had some troubles powering it up since it's USB powered and as it seems the default boot-up governor is set to "performance". I had to get a PSU.

So I have two questions. The firs one is why does the AL-ARM kernel default to performance when its set to ondemand on the rest of platforms? And the second one is if there is any way to change the governor for the boot process which doesn't require to build a custom kernel. Its a pitty I cant plug my board via USB on the go and play with it without trouble.

PS: I know how to change it once the system is up and running. I want to change it for the boot process.

[WarheadsSE]

try cpufreq.governor=ondemand

[agongon]

$this->bbcode_second_pass_quote('WarheadsSE', 't')ry cpufreq.governor=ondemand

[WarheadsSE]

I understand that. I was saying try using that in the kernel command line

[agongon]

$this->bbcode_second_pass_quote('WarheadsSE', 'I') understand that. I was saying try using that in the kernel command line

[pepedog]

I can't test this, btw
On the raspberry pi you can do this
echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
Do cpu1 too for the beagle bone I presume.
So following https://wiki.archlinux.org/index.php/Systemd#Temporary_files pick an early service
/etc/tmpfiles.d/nameofchosenservice.conf
$this->bbcode_second_pass_code('', 'w /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor - - - - ondemand
w /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor - - - - ondemand')
Hope it is early enough

[agongon]

$this->bbcode_second_pass_quote('pepedog', '/')etc/tmpfiles.d/nameofchosenservice.conf
$this->bbcode_second_pass_code('', 'w /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor - - - - ondemand')

[kmihelich]

The latest bootloader tarball available on the installation page has a fix in the uEnv.txt for allowing >500mA through the mini-USB port.

You can also add this to your current uEnv.txt by adding the following command to uenvcmd:
$this->bbcode_second_pass_code('', 'i2c mw 0x24 1 0x3e')

To make it look like this:
$this->bbcode_second_pass_code('', 'uenvcmd=run findfdt; if test $board_name = A335BNLT; then i2c mw 0x24 1 0x3e; setenv mmcde.....')

However, because we know it can draw over 500mA, we recommend using a USB charger that can supply more than this as opposed to a port on a computer.