<p><span class="h-card" translate="no"><a href="https://mastodon.social/@whitequark" class="u-url mention">@<span>whitequark</span></a></span> it feels to me like some sort of loader instructions, maybe for handling a sparse image or doing RLE or something. It seems like the bootloader occupies the first 64 kiB of the address space, which you could potentially use to narrow down MCUs by flash geometry -- bet whatever part this is has a 64 kiB initial erase sector, which rules out a lot of ST parts, for instance.</p>