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

[Raymond Mao]

Hi Venkatesh,

On Wed, 20 Aug 2025 at 01:15, Abbarapu, Venkatesh
<venkatesh.abbarapu at amd.com> wrote:
>
> [AMD Official Use Only - AMD Internal Distribution Only]
>
> Hi @Raymond Mao,
> I was trying to test these patches with the transfer list binary which contains tl.bin(dtb+dtbo) inside it. Facing issue with the dtbo address and fdt_check_header(*blob) from fdtdec_apply_dto_blob() gets the invalid magic num.

Currently, DTO support is not enabled in TF-A qemu - It won't append a
DTO via qemu so I am not sure if you had your own patch or platform
code to make this work.
To verify this U-Boot patch, please simply follow the 'Notes for
testing' in my cover letter, my working branch referred by my manifest
provides necessary changes for TF-A and OP-TEE to allow loading a DTO
file via qemu, place it into a TF-A reserved memory and append it as a
TE.

Regards,
Raymond

> fdt_magic=0x38 fdt_chk_version=0x1
>
> Attaching the log with details. Let me know if you need any other information.
>
> Thanks
> Venkatesh
>
> > -----Original Message-----
> > From: Raymond Mao <raymond.mao at linaro.org>
> > Sent: Friday, July 18, 2025 7:46 PM
> > To: u-boot at lists.denx.de
> > Cc: Simek, Michal <michal.simek at amd.com>; Abbarapu, Venkatesh
> > <venkatesh.abbarapu at amd.com>; Raymond Mao <raymond.mao at linaro.org>;
> > Tom Rini <trini at konsulko.com>; Tuomas Tynkkynen <tuomas.tynkkynen at iki.fi>;
> > Liviu Dudau <liviu.dudau at foss.arm.com>; Simon Glass <sjg at chromium.org>; Ilias
> > Apalodimas <ilias.apalodimas at linaro.org>; Dan Carpenter
> > <dan.carpenter at linaro.org>; Patrick Rudolph <patrick.rudolph at 9elements.com>;
> > Andrew Goodbody <andrew.goodbody at linaro.org>; Harrison Mutai
> > <harrison.mutai at arm.com>; Jerome Forissier <jerome.forissier at linaro.org>;
> > Heinrich Schuchardt <xypron.glpk at gmx.de>; Evgeny Bachinin
> > <EABachinin at salutedevices.com>; Matthias Brugger <mbrugger at suse.com>; Lad
> > Prabhakar <prabhakar.mahadev-lad.rj at bp.renesas.com>
> > Subject: [PATCH v3 0/6] Add support for DT overlays handoff
> >
> > 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.x
> > ml
> >
> > 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(-)
> >
> > --
> > 2.25.1
>