u-boot.git/lib/fdtdec.c, branch v2026.07

lib: fdtdec: validate bloblist FDT before consuming libfdt size

2026-05-08T21:49:27Z

Coverity Scan defects are observed in fdtdec_apply_bloblist_dtos(), since the live FDT taken from the bloblist is passed to libfdt helpers which consume header size/offset fields: - fdt_open_into() - fdt_pack() Validate the bloblist FDT with fdt_check_full() before calling fdt_open_into() and again after applying overlays before calling fdt_pack(). This makes the libfdt consumers operate on a checked FDT blob while keeping the existing flow unchanged. Also normalize libfdt return codes from this path to errno values, including the overlay callback path through bloblist_apply_blobs(). Fixes: b70cbbfbf94f ("fdtdec: apply DT overlays from bloblist") Addresses-Coverity-ID: CID 645837: (TAINTED_SCALAR) Signed-off-by: Raymond Mao Reviewed-by: Alexander Sverdlin

fdt: check fdt_pack() return value in fdtdec_apply_bloblist_dtos()

2026-05-04T18:56:08Z

The fdt_pack() function can return an error code, but its return value was not being checked. Add proper error handling to propagate any failure. Also fix typo in comment: "Shink" -> "Shrink". Addresses-Coverity-ID: CID 645839: Error handling issues (CHECKED_RETURN) Signed-off-by: Michal Simek Reviewed-by: Alexander Sverdlin Reviewed-by: Simon Glass Reviewed-by: Raymond Mao

Merge patch series "Add support for DT overlays handoff"

2026-04-27T15:44:40Z

Raymond Mao says: 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 Link: https://lore.kernel.org/r/20250718141621.3147633-1-raymond.mao@linaro.org

fdtdec: apply DT overlays from bloblist

2026-04-27T15:42:36Z

During FDT setup, apply all existing DT overlays from the bloblist to the base FDT if bloblist is being used for handoff from previous boot stage. According to the Firmware Handoff spec update to support DT overlay [1], an overlay must have the same top-level compatible string as its target base DT has. Before applying the overlays, check whether sufficient space is reserved in the base DT blob, if not, resize the blob to the allowed padded size, which is limited by CONFIG_SYS_FDT_PAD and the bloblist spare space size. After all overlays are applied, resize the merged DT to its actual size. [1] Add Transfer Entry for Devicetree Overlay https://github.com/FirmwareHandoff/firmware_handoff/pull/74 Signed-off-by: Raymond Mao Reviewed-by: Tom Rini Tested-by: Michal Simek

Merge patch series "Linux compat improvements and CCF prep"

2026-04-21T17:21:59Z

Casey Connolly says: This series implements various improvements to Linux header compatibility, largely in preparation for a full port of Linux CCF but many of these changes would also be helpful when porting other drivers. Beside the basic header/compat stuff there are a few larger patches: Patch 1 adds the "%pOF" format specifier to vsprintf, this behaves the same as it does in Linux printing the name of the ofnode, but notably it expects an ofnode pointer rather than a device_node. Patch 2 adds an option to skip doing a full DM scan pre-relocation. Some platforms like Qualcomm don't actually need devices to be probed prior to relocation, it is also quite slow to scan the entire FDT before caches are up. This option gets us to main loop 30-50% faster. Unfortunately it isn't possible to totally skip DM since U-Boot will panic if it can't find a serial port, but the serial uclass code will bind the serial port itself by reading /chosen/stdout-path, however any dependencies like clocks won't be found so this should only be enabled if the serial driver gracefully handles missing clocks. Patch 3 adds [k]strdup_const(), this works the same as the Linux version saving a small amount of memory by avoiding duplicating strings stored in .rodata, this is particularly useful for CCF. Patch 4 adds 64-bit versions of some 32-bit ofnode utilities functions, making it possible to parse 64-bit arrays. Patch 6 provides a simple implementation of kref, this will be used by CCF. Patch 9 adds devm_krealloc() support to devres, it relies on storing allocation sizes in the devres struct which will add a small overhead. Link: https://lore.kernel.org/r/20260401-casey-ccf-compat-v2-0-414d5b7f040b@linaro.org

ofnode: add read_u64_array and count_elems_of_size

2026-04-21T17:19:49Z

These are similar to their Linux counterparts, adding helpers for reading arrays of 64-bit values with of_access and fdtdec implementations. Signed-off-by: Casey Connolly

fdt: Prefer %pap over %llx

2026-03-25T20:37:03Z

In cases where phys_addr_t/phys_size_t is being printed, it's possible to use tiny-printf-friendly %pap instead of %llx. For instance, in SPL, with tiny-printf: Before the patch: fdtdec_setup_memory_banksize: DRAM Bank #0: start = 0xx, size = 0xx After the patch: fdtdec_setup_memory_banksize: DRAM Bank #0: start = 80000000, size = 40000000 Signed-off-by: Alexander Sverdlin

fdtdec: Add declaration for get_next_memory_node() helper

2026-02-13T07:16:24Z

Add get_next_memory_node() function declaration to fdtdec.h to support iterating through multiple memory nodes in device tree. This function is used to enumerate memory banks when the system has non-contiguous or multiple memory regions defined with device_type = "memory". The function implementation already exists in lib/fdtdec.c (lines 1298-1305) but was missing the public declaration in the header file. This patch adds the declaration and includes dm/ofnode_decl.h for the ofnode type definition. This is needed for platforms that require early memory enumeration before standard fdtdec_setup_memory_banksize() is called, particularly for dynamic MMU page table size calculation based on actual DRAM configuration. Signed-off-by: Pranav Sanwal Signed-off-by: Michal Simek Link: https://lore.kernel.org/r/20260129120021.1328653-2-pranav.sanwal@amd.com

bloblist: fix the overriding of fdt from bloblist

2025-04-28T16:13:19Z

When a bloblist is valid and contains fdt, it explicitly means a previous boot stage is passing transfer list compliant with Firmware Handoff specification, thus the fdt from bloblist should not be overridden with the ones from board or env variables. Fixes: 70fe23859437 ("fdt: Allow the devicetree to come from a bloblist") Signed-off-by: Raymond Mao Reviewed-by: Caleb Connolly Reviewed-by: Ilias Apalodimas Reviewed-by: Simon Glass

Merge patch series "Keep the access to dtb_dt_embedded() within fdtdec"

2024-12-31T16:57:54Z

Evgeny Bachinin says: The 1st patch addresses comments from the post-review, available by link [1]. The 2nd patch fixes problems of dtb_dt_embedded() with checkpatch. Links: [1] https://lore.kernel.org/u-boot/CAFLszTgEKamsa6FTnjzrEWQBLkqAR7EBbZqffx09AKgQ7ppuVA@mail.gmail.com/#t Link: https://lore.kernel.org/r/20241211-dtb_dt_embedded_within_fdtdec-v1-0-7840469f0084@salutedevices.com