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Where does the OpenBSD source code start?

To clarify the original post below, I mean when I hit the power button on my OpenBSD machine, what exactly happens? What line of code in what file does (I suppose the UEFI app) say to the CPU "okay I want you to start running this thousands-of-files-of-code software package that is OpenBSD here"?

https://www.reddit.com/r/openbsd/comments/lzw13b/where_does_the_openbsd_source_code_start/

#boot #system
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