Ampere: Add in-band NVPARAM access support #241
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
added 3 commits
November 9, 2024 15:22
NVParamLibConstructor function will locate gEfiMmCommunication2ProtocolGuid protocol which is required to communicate with ATF for Altra NVPARAM access. Without this step, all NVPARAM access of DXE_RUNTIME_DRIVER will return EFI_INVALID_PARAMETER error. Signed-off-by: Nhi Pham <[email protected]>
NVParamRuntimeDxe is a proxy to access NVPARAM at runtime via UEFI variables
like NVParamOffset and NVParamValue.
UEFI Variable GUID for the runtime NVPARAM access:
0xa12544a4, 0xbcc0, 0x4b12, { 0xaa, 0x56, 0x0a, 0x2a, 0x76, 0xf1, 0x65, 0x63 }
To read a NVPARAM:
+ Write offset to UEFI variable name "NVParamOffset"
+ Read back UEFI variable name "NVParamValue"
To write a NVPARAM:
+ Write offset to UEFI variable name "NVParamOffset"
+ Write 4 bytes value to UEFI variable name "NVParamValue"
Signed-off-by: Nhi Pham <[email protected]>
NVParamRuntimeDxe allows to read/write NVPARAM at runtime via UEFI
variables.
To read a NVPARAM:
+ Write offset to UEFI variable name "NVParamOffset"
+ Read back UEFI variable name "NVParamValue"
To write a NVPARAM:
+ Write offset to UEFI variable name "NVParamOffset"
+ Write 4 bytes value to UEFI variable name "NVParamValue"
Signed-off-by: Nhi Pham <[email protected]>
|
For this patch series, |
chuongtranle
approved these changes
Nov 13, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This introduces NVPARAM Runtime DXE driver to provide in-band NVPARAM access in runtime.