Decisions

Architecture decision records, Nygard’s shape (status, context, decision, consequences) with dated updates.

• 1. No bootloader unlock until a way back to stock is proven
• 2. Experiment on a spare M.2 2230 SSD; keep the stock drive intact
• 3. First boot through a ChromeOS kernel partition on external storage
• 4. Mainline device tree forked from the XPS 13 9345; stock tree as hardware map only
• 5. Vendor content and per-unit identifiers stay out of git; extraction stays reproducible
• 6. Debug console through GSC CCD and a SuzyQ, read-only while CCD is locked
• 7. Local kernel patches live in kernel/patches/ and apply at build time
• 8. The board DTS removes the PSCI domain idle states (cluster cl4/cl5, system ss3)
• 9. No PSCI cpuidle on mica: the per-CPU domains lose cluster_c4
• 10. Milestones M0 to M7, a feature status table, and the upstream hold ends at M5
• 11. Versions: CalVer tags for released images, the gbook version in uname -r
• 12. M3 rootfs: Debian sid from a snapshot, on the stick’s partition 2, entered by switch_root
• Decisions