[linux-yocto] [PATCH 2/3] meta: efi-ext.cfg: replace EFI_VARS with EFIVAR_FS

[Stefan Stanacar]

Linux kernel exposes EFI variables data to userspace via 2 interfaces:
- old sysfs-efivars interface (CONFIG_EFI_VARS), populated at /sys/firmware/efi/vars,
1024 byte maximum per-variable data size limitation, no UEFI Secure Boot variables support
and not recommended anymore.
- new efivarfs interface (CONFIG_EFIVAR_FS), typically mounted like this:
mount -t efivarfs efivarfs /sys/firmware/efi/efivar
It was added in 3.8 intended as a replacement for the sysfs-efivars interface,
has no maximum per-variable size limitation and supports UEFI Secure Boot variables.
It also allows creating new vars easily, a very useful trick:
printf "\x07\x00\x00\x00\x00" > /sys/firmware/efi/efivar/myvar-12345678-1234-1234-1234-123456789abc

Signed-off-by: Stefan Stanacar <stefanx.stanacar at intel.com>
---
 meta/cfg/kernel-cache/cfg/efi-ext.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/cfg/kernel-cache/cfg/efi-ext.cfg b/meta/cfg/kernel-cache/cfg/efi-ext.cfg
index 6371da2..edceb75 100644
--- a/meta/cfg/kernel-cache/cfg/efi-ext.cfg
+++ b/meta/cfg/kernel-cache/cfg/efi-ext.cfg
@@ -10,5 +10,5 @@ CONFIG_PARTITION_ADVANCED=y
 # Add support for optional EFI features
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_FB_EFI=y
-CONFIG_EFI_VARS=y
+CONFIG_EFIVAR_FS=y
 CONFIG_EFI_PARTITION=y
-- 
1.8.5.3