This article got it right. The only bummer is that good changes went into early 6.15 for i486 support that was tested. They’re in the stable patch trees now, but 6.14 mainline is a bit more raw for i486. Good enough perhaps.

https://arstechnica.com/gadgets/2025/05/linux-to-end-support-for-1989s-hottest-chip-the-486-with-next-release/

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