[PATCH v2 1/2] scripts/Makefile.xpl: Align filtered DTB to 8-byte within multidtb.fit

[Padhi, Beleswar]

On 1/12/2026 8:09 PM, Marek Vasut wrote:
> On 1/12/26 11:11 AM, 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.
>
> Because DT properties are 4-byte aligned, and fitImage is a DT with 
> long binary strings encoded in them. But that is not the case here, 
> because the invocation does use mkimage -E .
>
> Therefore I see two issues:
> - Should the code which handles LEGACY fitImages with 4-byte alignment 
> be fixed to relocate the blobs ? I think yes.


This we can fix in the Makefile via the dd command as suggested by Tom.

> - Should mkimage -E align blobs to 8 bytes by default ? I think yes, 
> and frankly, I thought it does so already, but apparently not.


This can be done, but should it be? Not all FITs demand an 8-byte
alignment right? It is only the FDT which requires this.