Setting CMA in armbian

[ajellisuk]

Hello

 

I need to increase the size of the CMA on my armbian set up. But I've not found a way to do it.

 

Is there a kernel command line option I need to pass to increase the CMA size, or is this done in the kernel configuration before building?

 

Thanks in advance

 

Andrew

[usual user]

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kernel-parameters.txt

[ajellisuk]

Thank you for the link.

 

For the benefit of anyone else who may come accross this post:

I added the following line to "/boot/boot.cmd/"

setenv bootargs "${bootargs} cma=xM"

 

where x is the size of RAM allocated to CMA.

 

I then compiled the file with:

mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr

 

Hopefully this will help anyone else who runs into this issue.

 

Andrew