[PATCH v3 0/6] Add support for DT overlays handoff

[Raymond Mao]

Hi,

The Firmware Handoff spec changes required for this series is already accepted and merged at [1].

Please review and merge this series.

[1] Add Transfer Entry for Devicetree Overlay
https://github.com/FirmwareHandoff/firmware_handoff/pull/74

Thanks and regards,

Raymond

On 2025-07-18 10:16 a.m., Raymond Mao wrote:

> The series include refactoring on bloblist and fdtdec to support handoff
> of multiple DT overlays and applying them into the DT base during setup.
> All changes are aligned to the spec update for supporting DT overlay
> handoff[1].
>
> Notes for testing:
>
> Currently DT overlay is not yet enabled in TF-A, but with the test patches
> I provided for TF-A and OP-TEE build, importing a DT overlay blob file from
> QEMU to TF-A reserved memory is supported.
> Follow below instructions to build and run for test:
> $ repo init -u https://github.com/OP-TEE/manifest.git -m qemu_v8.xml
> Replace your local qemu_v8.xml with [2], which contains all necessary
> changes in both TF-A and OP-TEE build.
> $ repo sync
> $ cd build
> $ make toolchains
> $ make ARM_FIRMWARE_HANDOFF=y all
> Copy and rename your DT overlay blob as 'qemu_v8.dtb' into out/bin
> $ make ARM_FIRMWARE_HANDOFF=y run-only
>
> [1] Add Transfer Entry for Devicetree Overlay
> https://github.com/FirmwareHandoff/firmware_handoff/pull/74
>
> [2] https://github.com/raymo200915/optee_manifest/blob/dt_overlay_handoff/qemu_v8.xml
>
> Raymond Mao (6):
>    bloblist: add blob type for DT overlay
>    bloblist: add helper functions
>    bloblist: fix a potential negative size for memmove
>    bloblist: add API for applying blobs with specified tag
>    fdtdec: apply DT overlays from bloblist
>    configs: Select OF_LIBFDT_OVERLAY to hand over DTO via bloblist
>
>   common/bloblist.c                       | 67 ++++++++++++++++++++-
>   configs/qemu_arm64_defconfig            |  1 +
>   configs/vexpress_fvp_bloblist_defconfig |  1 +
>   include/bloblist.h                      | 34 ++++++++++-
>   lib/fdtdec.c                            | 80 +++++++++++++++++++++++++
>   5 files changed, 181 insertions(+), 2 deletions(-)
>