On Thu, 15 Sept 2022 at 03:16, Sughosh Ganu sughosh.ganu@linaro.org wrote:
diff --git a/doc/develop/uefi/fwu_updates.rst b/doc/develop/uefi/fwu_updates.rst new file mode 100644 index 0000000000..fad3fbb3a8 --- /dev/null +++ b/doc/develop/uefi/fwu_updates.rst @@ -0,0 +1,165 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. Copyright (c) 2022 Linaro Limited
+FWU Multi Bank Updates in U-Boot +================================
+The FWU Multi Bank Update feature implements the firmware update +mechanism described in the PSA Firmware Update for A-profile Arm +Architecture specification [1]. Certain aspects of the Dependable +Boot specification [2] are also implemented. The feature provides a +mechanism to have multiple banks of updatable firmware images and for +updating the firmware images on the non-booted bank. On a successful +update, the platform boots from the updated bank on subsequent +boot. The UEFI capsule-on-disk update feature is used for performing +the actual updates of the updatable firmware images.
+The bookkeeping of the updatable images is done through a structure +called metadata. Currently, the FWU metadata supports identification +of images based on image GUIDs stored on a GPT partitioned storage +media. There are plans to extend the metadata structure for non GPT +partitioned devices as well.
+Accessing the FWU metadata is done through generic API's which are +defined in a driver which complies with the U-Boot's driver model. A +new uclass UCLASS_FWU_MDATA has been added for accessing the FWU +metadata. Individual drivers can be added based on the type of storage +media, and it's partitioning method. Details of the storage device +containing the FWU metadata partitions are specified through a U-Boot +specific device tree property `fwu-mdata-store`. Please refer to +U-Boot `doc <doc/device-tree-bindings/firmware/fwu-mdata-gpt.yaml>`__ +for the device tree bindings.
+Enabling the FWU Multi Bank Update feature +------------------------------------------
+The feature can be enabled by specifying the following configs::
- CONFIG_EFI_CAPSULE_ON_DISK=y
- CONFIG_EFI_CAPSULE_FIRMWARE_MANAGEMENT=y
- CONFIG_EFI_CAPSULE_FIRMWARE=y
- CONFIG_EFI_CAPSULE_FIRMWARE_RAW=y
- CONFIG_FWU_MULTI_BANK_UPDATE=y
- CONFIG_CMD_FWU_METADATA=y
- CONFIG_DM_FWU_MDATA=y
s/CONFIG_DM_FWU_MDATA/CONFIG_FWU_MDATA