[PATCH v3] mkimage: Default to 8-byte alignment for DTBs added via -b argument

[Tom Rini]

On Thu, Jan 22, 2026 at 10:52:47PM +0530, Beleswar Padhi wrote:

> When CONFIG_SPL_MULTI_DTB_FIT is enabled, multiple device trees are
> packed inside the multidtb.fit FIT image. While the individual DTBs
> and the FIT image start address are 8-byte aligned, the DTBs embedded
> within the FIT image are not guaranteed to maintain 8-byte alignment.
> 
> This misalignment causes -FDT_ERR_ALIGNMENT failure in
> setup_multi_dtb_fit() when locating the next available DTB within the
> FIT blob and setting gd->fdt_blob, because of the recent libfdt
> hardening since commit 0535e46d55d7 ("scripts/dtc: Update to upstream
> version v1.7.2-35-g52f07dcca47c")
> 
> The mkimage tool already supports enforcing this alignment via the -B
> option, but users would have to specify it explicitly. This change
> makes 8-byte alignment the default when using -b.
> 
> Reported-by: Anshul Dalal <anshuld at ti.com>
> Closes: https://lore.kernel.org/u-boot/DFJ950O0QM0D.380U0N16ZO19E@ti.com
> Fixes: 0535e46d55d7 ("scripts/dtc: Update to upstream version v1.7.2-35-g52f07dcca47c")
> Signed-off-by: Beleswar Padhi <b-padhi at ti.com>

Tested-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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