BFE Engineering
42fb386f60
Replace every em dash with real punctuation (rewrites, not hyphen swaps) in docs, code comments, scripts, configs, and the port records; convert en dashes, curly quotes, ellipsis glyphs, arrows, and section signs to ASCII; drop machine-writing tell phrases from living docs. ADR titles now use a colon. The M2 bring-up DTS model string carried an em dash into the patch series and its record echoes; fixed at both, and the full series re-verified to apply cleanly onto pristine 6.18.46. One comment in freshness.h deliberately names the em dash glyph the UI renders as the unknown mark; that is data, kept as prose naming it. Verified: cargo tests (sim, config-lint, rs485-bridge), shellcheck, both driver MC/DC harnesses, patches-apply.
1.5 KiB
1.5 KiB
ADR 0001: Kernel Forward-Port
Status: Accepted (2026-08-25). Supersedes the README's original plan44/6.6 goal.
Context
The vendor kernel is Rockchip 5.10.160 (via Luckfox). We want the newest stable Linux runnable on our Buildroot LTS (2025.02.x). Two candidate paths existed: (a) baseline on plan44's OpenWrt RV1106 fork (Linux 6.6, 152 RV1106 patches), or (b) forward-port the vendor tree directly onto a chosen upstream stable.
Decision
Forward-port directly to Linux 6.18.46 from vendor 5.10.160, carrying no
plan44/OpenWrt code. Reuse the already-upstream rv1126 register data where it
matches the RV1106 ("RV-series lite" VOP, clk, pinctrl), and carry the RV1106
deltas as a reviewable patch series in patches/.
Consequences
- Done and hardware-verified on
warden-c8a3: clk, pinctrl, eMMC, GMAC, TRNG, OTP, SARADC/TSADC, RTC, USB host, PWM/backlight, VOP display, GT911 touch, AIC8800 wifi, RGA, I2S audio, HPMCU mailbox, open NPU driver, PVTM. - uClibc stays required: RGA/MPP/ISP/NPU userspace ship as uClibc-only blobs; a glibc swap breaks media (flare-edge #51, wontfix). Any kernel bump inherits this.
- Kernel bumps risk struct-ABI breaks for out-of-tree modules (the AIC8800/VLAN
struct net_deviceoffset saga). Mitigation: ship one matched full boot+oem image, never a partial reflash. - Deferred by design: crypto-v3 accelerator (CPU crypto already covers the need), open NPU compute (a person-year register-RE effort, no RV1106 prior art).