edge: add post for generic sm7150 migration

I am contemplating trying if a split install can be converted without data loss, but that'll take me a while to try out. For now, the rest of the post should be ready.

mentioned in merge request pmaports!6286 (merged)

Thanks for the MR, Did not find anything wrong with it, just the end could maybe improved a little bit.

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Really exciting to see this come together!

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I don't think putting in the effort to try to provide a migration path for split installs is worth it. I'm willing to bet that no such install currently exists in the wild, and it would involve a lot of commands where things may not work as intended.

My idea was:

• Delete the old device package
• Install the new one
• Format cache as vfat and mount it at /boot
• Run mkinitfs
• Fix the boot partition UUID

All that is quite tricky to test because I can't just install the packages from a repo (since it's only in a MR at the moment) and I think this is IMO just wasted effort and might create confusion.

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Fixed the trailing whitespace, my bad.

I suggest linking to:

• pmaports!6286 (merged)
• https://wiki.postmarketos.org/wiki/Backup_and_restore_your_data

Should be merged together with pmaports!6286 (merged) it seems.

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