When in Trial State, the platform keeps a count of the number of times
it has booted in the Trial State. Once the threshold of the maximum
allowed count exceeds, the platform reverts to boot from a different
bank on subsequent boot, thus coming out of the Trial State. It is
expected that all the updated images would be accepted or rejected
while the platform is in Trial State. Put in checks so that it is not
possible to apply an empty capsule once the max Trial Count exceeds.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Tested-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

The FWU code supports both versions of the FWU metadata, i.e. v1 and
v2. A platform can then select one of the two versions through a
config symbol. Put a dependency in the FWU metadata version selection
config symbol to ensure that both versions of the metadata cannot be
enabled.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Michal Simek <michal.simek@amd.com>
Tested-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

The platform transitions out of Trial State into the Regular State
only when all the images in the update bank have been accepted. Check
for this condition before transitioning out of Trial State.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Tested-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Do a sanity check that the version of the FWU metadata that has been
read aligns with the version enabled in the image. This allows to
indicate an early failure as part of the FWU module initialisation.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Tested-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

In the version 2 of the FWU metadata, the metadata is broken into two
parts, a top-level structure, which provides information on the total
size of the structure among other things. Try reading the primary
partition first, and if that fails, try reading the secondary
partition. This will help in the scenario where the primary metadata
partition has been corrupted, but the secondary partition is intact.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Tested-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Move this header to include/u-boot/ so that it can be used by external
tools.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

Use the API function list_count_nodes() to count the number of list
entries.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

Drop all duplicate newlines. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Sughosh Ganu <sughosh.ganu@linaro.org> says:

The following patch series adds support for version 2 of the FWU
metadata. The version 2 metadata structure is defined in the latest
revision of the FWU specification [1].

The earlier versions of these patches were migrating to a version 2
only support in U-Boot, similar to TF-A. However, based on feedback
from ST [2], this series has been updated to support both versions. A
platform would still be needed to enable one of the two versions of
metadata through a config symbol.

TF-A has code which reads the FWU metadata and boots the platform from
the active partition. TF-A has decided to migrate the FWU code to a
version 2 only support. These changes have been merged in upstream
TF-A.

These changes have been tested on the ST DK2 board, which uses the GPT
based partitioning scheme. Both V1 and V2 metadata versions have been
tested on the DK2 board.

These changes need to be tested on platforms with MTD partitioned
storage devices.

Make changes to the functions used for generating the DFU's alt
variable so that the FWU image information is obtained from the common
version agnostic structure instead of reading the metadata.

While here, also update the name of the field used for storing the
image GUID in the FWU metadata.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Tested-by: Michal Simek <michal.simek@amd.com>