On 8/26/23 11:06, Sughosh Ganu wrote:
Provide a way for removing certain devicetree nodes and/or properties from the devicetree. This is needed to purge certain nodes and properties which may be relevant only in U-Boot. Such nodes and properties are then removed from the devicetree before it is passed to the kernel. This ensures that the devicetree passed to the OS does not contain any non-compliant nodes and properties. The removal of the nodes and properties is being done through an EVT_FT_FIXUP handler. I am not sure if the removal code needs to be behind any Kconfig symbol. I have only build tested this on sandbox, and tested on qemu arm64 virt platform. This being a RFC, I have not put this through a CI run.
We should have a test for the new functionality. E.g. add some superfluous properties and nodes to arch/sandbox/dts/test.dts, delete them via the DT_PURGE macro, and check that the device-tree passed to an EFI binary does not contain these properties and nodes. Best regards Heinrich
Sughosh Ganu (5): dt: Provide a way to remove non-compliant nodes and properties fwu: Add the fwu-mdata node for removal from devicetree capsule: Add the capsule-key property for removal from devicetree bootefi: Call the EVT_FT_FIXUP event handler doc: Add a document for non-compliant DT node/property removal cmd/bootefi.c | 18 +++++ .../devicetree/dt_non_compliant_purge.rst | 64 ++++++++++++++++ drivers/fwu-mdata/fwu-mdata-uclass.c | 5 ++ include/dt-structs.h | 11 +++ lib/Makefile | 1 + lib/dt_purge.c | 73 +++++++++++++++++++ lib/efi_loader/efi_capsule.c | 7 ++ 7 files changed, 179 insertions(+) create mode 100644 doc/develop/devicetree/dt_non_compliant_purge.rst create mode 100644 lib/dt_purge.c
