efi: Capsule update support
Give userland an interface for passing binary blobs to the firmware via
the EFI capsule update mechanism. This is useful for performing firmware
upgrades.
A new hierarchy is created for all capsule data under,
/sys/firmware/efi/capsule/
Multiple capsules can be loaded with something along the lines of,
for f in $CAP_FILES; do
echo 1 > /sys/firmware/efi/capsule/loading
cat $f > /sys/firmware/efi/capsule/data
echo 0 > /sys/firmware/efi/capsule/loading
done
Loading of capsule data can be aborted by writing -1 to 'loading',
echo -1 > /sys/firmware/efi/capsule/loading
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
7 files changed