[meta-intel] Atom E3826 storage that survives over reboot

[Teemu K]

On Tue, Jan 22, 2019 at 12:13 PM Burton, Ross <ross.burton at intel.com> wrote:
>
> EFI variables should work?
After doing some googling it looks promising. I just couldn't find any
info how to actually do it. Also I don't know how big chunk of code is
needed to access them from grub.  Linux seems to have filesystem for
that.

-Teemu

>
> Ross
>
> On Tue, 22 Jan 2019 at 08:20, Teemu K <maillinglists18 at gmail.com> wrote:
> >
> > Hi,
> >
> > Not exactly Yocto related, but was wondering if anyone have (new) ideas here.
> >
> > I have HW that has Congate TCA-3 board with Atom E3826 processor
> > running Linux and there is need to relay information from Linux to
> > bootloader for next warm boot. I only need few bytes. This information
> > is used to determine if to boot secondary system on device or if to
> > execute factory reset etc.
> >
> > Any idea where/how to store the information so it'd be (somewhat)
> > easily accessible in bootloader(grub)? Congatec has their own CGOS
> > system, but it's way too big for this job and doesn't work outside
> > Linux. I'm not entirely sure if writing to RAM is good idea ie. can it
> > lose it content on reboot?
> >
> > Of course generic approach would be nice, but Atom E3826 specific is
> > also fine atm.
> >
> > -TeemuK
> > --
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