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contact devel+owner@edk2.groups.io Resent-Date: Mon, 02 Dec 2024 12:01:53 -0800 Resent-From: prachotan.bathi@arm.com Reply-To: devel@edk2.groups.io,prachotan.bathi@arm.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: hgYxpIyaNIappG1RcEU5pNcox7686176AA= Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_DU5PR08MB1041382462CFCF678E4306D99EF352DU5PR08MB10413eu_" X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20240830 header.b="Sa9Innq/"; dmarc=pass (policy=none) header.from=groups.io; spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 45.79.224.7 as permitted sender) smtp.mailfrom=bounce@groups.io --_000_DU5PR08MB1041382462CFCF678E4306D99EF352DU5PR08MB10413eu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 --- readme.md | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 readme.md diff --git a/readme.md b/readme.md new file mode 100644 index 0000000000..9165d19319 --- /dev/null +++ b/readme.md @@ -0,0 +1,47 @@ +# Firmware Handoff + +## Introduction + +The [Firmware Handoff Specification](https://firmwarehandoff.github.io/fir= mware_handoff/) defines a data structure (Transfer List) which facilitates = handing off information between different firmware stages involved in platf= orm initialization. + +The Firmware Handoff Specification is defined for ARM architecture (both A= Arch32 and AArch64) and is currently implemented in [ARM-Trusted Firmware](= https://trustedfirmware-a.readthedocs.io/en/latest/getting_started/build-op= tions.html#:~:text=3D)%20by%20default.-,TRANSFER_LIST,-%3A%20Setting%20this= %20to) . This branch will be used to: + +- Implement the specification and introduce TransferList support for ARM p= latforms in edk2. +- Migrate existing hand-off procedures to now use the standardized Transfe= rList + +## Goals + +- Streamline adoption by ARM platforms +- Minimize impact of migration and enable backward compatibility where pos= sible +- Reuse common code and a standardized library + +## Key Features + +1. Standardized Information Passing: + - Establishes a well-defined and scalable data structure (a TransferLi= st (TL) containing TransferList Entries (TEs)) + - Allows information to be propagated and accumulated as the system bo= ots +2. Register Usage Standardization: + - Defines the usage of scratch registers (e.g., x0-x3) at handoff boun= daries + - Ensures consistency across different firmware implementations + +## Benefits + +By implementing this specification, we aim to: + +1. Improve interoperability between different boot stages and firmware imp= lementations +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.
+ The edk2-staging guidelines can be found at + + +2. To submit a patch for edk2-staging repo include the branch name in + the subject line of the commit message.
+ e.g. **[staging/firmwarehandoff PATCH v<*n*> ]: Package/Module: Su= bject** + +3. To submit a patch for edk2-platforms staging repo include the branch + name in the subject line of the commit message.
+ e.g. **[platforms/devel-firmwarehandoff PATCH v<*n*> ]: Package/Mo= dule: Subject** \ No newline at end of file -- 2.34.1 IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. If you are not the intended recipient, p= lease notify the sender immediately and do not disclose the contents to any= other person, use it for any purpose, or store or copy the information in = any medium. Thank you. -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#120854): https://edk2.groups.io/g/devel/message/120854 Mute This Topic: https://groups.io/mt/109887505/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- --_000_DU5PR08MB1041382462CFCF678E4306D99EF352DU5PR08MB10413eu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thi= s 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>
---
 readme.md | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 readme.md

diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000000..9165d19319
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,47 @@
+# Firmware Handoff
+
+## Introduction
+
+The [Firmware Handoff Specification](https://firmwarehandoff.github.io/fir= mware_handoff/) defines a data structure (Transfer List) which facilitates = handing off information between different firmware stages involved in platf= orm initialization.
+
+The Firmware Handoff Specification is defined for ARM architecture (both A= Arch32 and AArch64) and is currently implemented in [ARM-Trusted Firmware](= https://trustedfirmware-a.readthedocs.io/en/latest/getting_started/build-op= tions.html#:~:text=3D)%20by%20default.-,TRANSFER_LIST,-%3A%20Setting%20this= %20to) . This branch will be used to:
+
+- Implement the specification and introduce TransferList support for ARM p= latforms in edk2.
+- Migrate existing hand-off procedures to now use the standardized Transfe= rList
+
+## Goals
+
+- Streamline adoption by ARM platforms
+- Minimize impact of migration and enable backward compatibility where pos= sible
+- 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 ha= ndoff boundaries
+    - Ensures consistency across different firmware implementati= ons
+
+## Benefits
+
+By implementing this specification, we aim to:
+
+1. Improve interoperability between different boot stages and firmware imp= lementations
+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. <B= R>
+   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>]: P= ackage/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**
\ No newline at end of file
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2.34.1

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