The proposal in https://github.com/systemd/systemd/pull/35091 suggests that there are going to be more resources sooner or later that shall be embeddable in a UKI, but are specific to some machine. The .hwids logic as it is implemented right now is conceptually flexible enough to cover that too (as long as the system has SMBIOS and thus CHIDs). Hence, let's prepare the ground for a future (that might possibly never come, but let's keep the door open) where the section can be reused for this purpose. The patch is really dumb ultimately. it just changes the initial field in the "Device" struct to carry not just the size of it (as before) but also a type indicator, that is for now fixed to 1, indicating DT blobs. This breaks compatibility, hence this should get merged before we do the v257 release, so that this is done properly before the first release with .hwids.
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