Description

G12/GXL boards with memory of 1GB or lower are unable to boot because the CMA memory pool is set to high. Leaving CMA at the default 256M and providing an overlay for those who need or want the CMA higher, makes more sense than not supporting all possible memory options provided by said SoC(s).

As an aside; I've noticed people have been unable to boot the Radxa Zero 512MB/1GB models using the current Armbian images.

Jira reference number [AR-9999]

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• [x] Installed and booted kernel without the current CMA patches applied. That left me at the current default which is 256M. Then using extlinux fdtoverlays, I added the overlay and rebooted giving me a CMA of 896M.
• [x] Test ran on a Radxa Zero 4GB and Le Potato 2GB. This should really be tested on boards with a lower memory count, but I don't have any available to me.

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules

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