[edk2-devel] [staging/firmwarehandoff PATCH v1 1/1] Branch to implement and migrate to Firmware Handoff for ARM Platforms

["Prachotan Bathi via groups.io" <prachotan.bathi=arm.com@groups.io>]

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This branch introduces a new staging branch for Firmware Handoff
specification to:
- Implement the specification and introduce TransferList support for
ARM platforms in edk2.
- Migrate existing hand-off procedures to now use the standardized
TransferList.

More description in the readme.

Please create the following branches:
1. edk2-staging repo
URL: https://github.com/tianocore/edk2-staging.git
Branch Name: firmwarehandoff

2. edk2-platforms repo
URL: https://github.com/tianocore/edk2-platforms.git
Branch Name: devel-firmwarehandoff

Signed-off-by: Prachotan Bathi <prachotan.bathi@arm.com>
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+# Firmware Handoff
+
+## Introduction
+
+The [Firmware Handoff Specification](https://firmwarehandoff.github.io/firmware_handoff/) defines a data structure (Transfer List) which facilitates handing off information between different firmware stages involved in platform initialization.
+
+The Firmware Handoff Specification is defined for ARM architecture (both AArch32 and AArch64) and is currently implemented in [ARM-Trusted Firmware](https://trustedfirmware-a.readthedocs.io/en/latest/getting_started/build-options.html#:~:text=)%20by%20default.-,TRANSFER_LIST,-%3A%20Setting%20this%20to) . This branch will be used to:
+
+- Implement the specification and introduce TransferList support for ARM platforms in edk2.
+- Migrate existing hand-off procedures to now use the standardized TransferList
+
+## Goals
+
+- Streamline adoption by ARM platforms
+- Minimize impact of migration and enable backward compatibility where possible
+- Reuse common code and a standardized library
+
+## Key Features
+
+1. Standardized Information Passing:
+    - Establishes a well-defined and scalable data structure (a TransferList (TL) containing TransferList Entries (TEs))
+    - Allows information to be propagated and accumulated as the system boots
+2. Register Usage Standardization:
+    - Defines the usage of scratch registers (e.g., x0-x3) at handoff boundaries
+    - Ensures consistency across different firmware implementations
+
+## Benefits
+
+By implementing this specification, we aim to:
+
+1. Improve interoperability between different boot stages and firmware implementations
+2. Simplify the process of passing critical system information during boot
+3. Provide a flexible framework that can accommodate future extensions and requirement.
+
+# Guidelines for submitting patches
+
+1. Follow the standard edk2 coding guidelines for preparing patches. <BR>
+   The edk2-staging guidelines can be found at
+   <https://github.com/tianocore/edk2-staging>
+
+2. To submit a patch for edk2-staging repo include the branch name in
+   the subject line of the commit message. <BR>
+   e.g. **[staging/firmwarehandoff PATCH v<*n*> <x/y>]: Package/Module: Subject**
+
+3. To submit a patch for edk2-platforms staging repo include the branch
+   name in the subject line of the commit message. <BR>
+   e.g. **[platforms/devel-firmwarehandoff PATCH v<*n*> <x/y>]: Package/Module: Subject**
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