Re: [coreboot] how to implement variable read/write variable in coreboot

[Nico Huber]

On 30.09.2017 16:12, Peter Stuge wrote:
> Nico Huber wrote:
> > In-flash variable format
> >
> > I like to keep things simple and assume that a key=value approach
> > suffices (for this layer). Though, as we have certainly to deal with
> > NOR flash chips (and their erase blocks), we can't just store things
> > in a table that would require an erase cycle for every change of a
> > variable. Here is a random proposal:
>
> We already have a simple coreboot-native key-value store: CBFS

Well, I never looked close, but everybody kept telling me for years that
CBFS is not designed for updates.

Nico
> Yes, there is some overhead with every CBFS entry, but IIRC the
> minimum alignment is 16 bytes.
>
> Melissa, how many variables do you think are actually needed?
>
> //Peter