[v7,00/13] FWU: Add FWU Multi Bank Update feature support

The patchset adds support for the FWU Multi Bank Update[1]
feature. Certain aspects of the Dependable Boot[2] specification have
also been implemented.

The FWU multi bank update feature is used for supporting multiple
sets(also called banks) of firmware image(s), allowing the platform to
boot from a different bank, in case it fails to boot from the active
bank. This functionality is supported by keeping the relevant
information in a structure called metadata, which provides information
on the images. Among other parameters, the metadata structure contains
information on the currect active bank that is being used to boot
image(s).

Functionality is being added to work with the UEFI capsule driver in
u-boot. The metadata is read to gather information on the update bank,
which is the bank to which the firmware images would be flashed to. On
a successful completion of the update of all components, the active
bank field in the metadata is updated, to reflect the bank from which
the platform will boot on the subsequent boots.

Currently, the feature is being enabled on the STM32MP157C-DK2 and
Synquacer boards. The DK2 board boots a FIP image from a uSD card
partitioned with the GPT partioning scheme, while the Synquacer board
boots a FIP image from a MTD partitioned SPI NOR flash device.

This feature also requires changes in a previous stage of
bootloader, which parses the metadata and selects the bank to boot the
image(s) from. Support has being added in tf-a(BL2 stage) for the
STM32MP157C-DK2 board to boot the active bank images. These changes 
have been merged to the upstream tf-a repository.

The earlier patchset contained patches for both the DK2 and the
Synquacer platforms. The handling of review comments for the Synquacer
platform is to be taken up by a different engineer, and has not been
done yet. After discussion with Tom Rini and Heinrich, it was decided
to send the patches for the DK2 platform separately for review. The
patch for adding a python test for the feature has been developed, and
was sent in the version 5 of the patches[3]. However, the test script
depends on adding support for the feature on MTD SPI NOR devices, and
that is being done as part of the Synquacer patches. Hence these set
of patches do not have the test script for the feature. That will be
added through the patches for adding support for the feauture on
Synquacer platform.

[1] - https://developer.arm.com/documentation/den0118/a
[2] - https://git.codelinaro.org/linaro/dependable-boot/mbfw/uploads/6f7ddfe3be24e18d4319e108a758d02e/mbfw.pdf
[3] - https://lists.denx.de/pipermail/u-boot/2022-June/485992.html

Changes since V6:
* Define the LOG_CATEGORY macro as suggested by Patrick
* Add some documentation in the fwu_get_mdata and fwu_update_mdata
  functions to describe the sequence of calls to be made for modifying
  the metadata, as suggested by Etienn
* Define the LOG_CATEGORY macro as suggested by Patrick
* s/STM32MP1/STM32MP15/ as suggested by Patrick


Sughosh Ganu (13):
  dt/bindings: Add bindings for FWU Metadata storage device
  FWU: Add FWU metadata structure and driver for accessing metadata
  FWU: Add FWU metadata access driver for GPT partitioned block devices
  stm32mp1: dk2: Add a node for the FWU metadata device
  stm32mp1: dk2: Add image information for capsule updates
  FWU: stm32mp1: Add helper functions for accessing FWU metadata
  FWU: STM32MP1: Add support to read boot index from backup register
  FWU: Add boot time checks as highlighted by the FWU specification
  FWU: Add support for the FWU Multi Bank Update feature
  FWU: cmd: Add a command to read FWU metadata
  mkeficapsule: Add support for generating empty capsules
  mkeficapsule: Add support for setting OEM flags in capsule header
  FWU: doc: Add documentation for the FWU feature

 arch/arm/dts/stm32mp157c-dk2-u-boot.dtsi      |   7 +
 arch/arm/mach-stm32mp/include/mach/stm32.h    |   5 +
 board/st/stm32mp1/stm32mp1.c                  |  67 +++
 cmd/Kconfig                                   |   7 +
 cmd/Makefile                                  |   1 +
 cmd/fwu_mdata.c                               |  80 +++
 common/board_r.c                              |   5 +
 doc/develop/uefi/fwu_updates.rst              | 156 ++++++
 doc/develop/uefi/index.rst                    |   1 +
 doc/develop/uefi/uefi.rst                     |   2 +
 .../firmware/fwu-mdata.yaml                   |  32 ++
 doc/mkeficapsule.1                            |  33 +-
 drivers/Kconfig                               |   2 +
 drivers/Makefile                              |   1 +
 drivers/fwu-mdata/Kconfig                     |  16 +
 drivers/fwu-mdata/Makefile                    |   7 +
 drivers/fwu-mdata/fwu-mdata-uclass.c          | 469 ++++++++++++++++++
 drivers/fwu-mdata/fwu_mdata_gpt_blk.c         | 410 +++++++++++++++
 include/configs/stm32mp15_common.h            |   4 +
 include/dm/uclass-id.h                        |   1 +
 include/fwu.h                                 |  71 +++
 include/fwu_mdata.h                           |  67 +++
 lib/Kconfig                                   |   6 +
 lib/Makefile                                  |   1 +
 lib/efi_loader/efi_capsule.c                  | 231 ++++++++-
 lib/efi_loader/efi_setup.c                    |   3 +-
 lib/fwu_updates/Kconfig                       |  31 ++
 lib/fwu_updates/Makefile                      |   7 +
 lib/fwu_updates/fwu.c                         | 191 +++++++
 lib/fwu_updates/fwu_gpt.c                     |  88 ++++
 tools/eficapsule.h                            |   8 +
 tools/mkeficapsule.c                          | 105 +++-
 32 files changed, 2094 insertions(+), 21 deletions(-)
 create mode 100644 cmd/fwu_mdata.c
 create mode 100644 doc/develop/uefi/fwu_updates.rst
 create mode 100644 doc/device-tree-bindings/firmware/fwu-mdata.yaml
 create mode 100644 drivers/fwu-mdata/Kconfig
 create mode 100644 drivers/fwu-mdata/Makefile
 create mode 100644 drivers/fwu-mdata/fwu-mdata-uclass.c
 create mode 100644 drivers/fwu-mdata/fwu_mdata_gpt_blk.c
 create mode 100644 include/fwu.h
 create mode 100644 include/fwu_mdata.h
 create mode 100644 lib/fwu_updates/Kconfig
 create mode 100644 lib/fwu_updates/Makefile
 create mode 100644 lib/fwu_updates/fwu.c
 create mode 100644 lib/fwu_updates/fwu_gpt.c