Hi Rony,
on ARM Versatile Express the UEFI variables are stores on NOR Flash
(ArmPlatformPkg/Drivers/NorFlashDxe).
What you need to support Non-Volatile UEFI variables is a Non-Volatile Memory.
And also a driver that implements the EFI Firmware Volume Block protocol for
this NVM device.
I had a quick look to the Arndale features, I saw there is eMMC support. You
could use it as a NVM for your UEFI Variables.
FYI, I worked on a prototype to store UEFI variables into a file of a file
system supported by UEFI (eg: Fat32 partition). But we should forget this
support. If you want to support Set/Get UEFI Variable from UEFI Runtime
Services, you should not access the file system from the Runtime Services.
Best Regards,
Olivier
________________________________________
From: Rony Nandy [rony.na...@linaro.org]
Sent: 19 March 2013 06:35
To: Olivier Martin
Cc: edk2-devel@lists.sourceforge.net; grant.lik...@linaro.org
Subject: Regarding storing Boot Device Config in persistent memory
Hi Oliver,
I am trying to fix a issue related to UEFI on
Arndale(https://bugs.launchpad.net/arndale/+bug/1131141).The Arndale
boards do not store the Boot Device config, meaning that each time the
board boots, it defaults to the config built into the image.Ideally, the
board should store the config in some persistent storage, eg, flash or
SD card.
Do you have any suggestion as to where I need to work on to fix
this problem.How is this handled in VExpress?
Regards
Rony
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