[coreboot] How to enable SMMStore on MinowboardMax

[zahra rahimkhani]

Hello

I am trying to enable NVRAM for MainnoMax for the 4.11 branch.
I am trying to save persistence config in SOC E3825. (It has
a MC146818B-compatible 242 bytes of battery-backed RAM).

I enabled  the following options in coreboot 4.11 branch:

-

Use CMOS for configuration values
   -

Load default config values on each boot

And tested whether the configuration made by nvramcui (as my second
mayload) is persistent across power-offs with no luck.

I have the following questions and I would appreciate it if anyone can
answer any of these questions:
1.How to enable coreboot to save configuration on MinnowMAX?
2.With the battery connected to the board, is it correct to use nvramcui to
check persistent configuration?
3. I read about SMMSTORE as a way to store configuration changes in BIOS
without having an actual EEPROM storage but I don't know if I have to
enable it explicitly if my board doesn't support it.
4. How one can add SMMSTORE support for SoCs like Intel E3800 families.

Also I would be grateful if anyone can send me links to investigate any
further.