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.
29 lines
1.5 KiB
Markdown
29 lines
1.5 KiB
Markdown
# ADR 0001: Kernel Forward-Port
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**Status:** Accepted (2026-08-25). Supersedes the README's original plan44/6.6 goal.
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## Context
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The vendor kernel is Rockchip 5.10.160 (via Luckfox). We want the newest stable
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Linux runnable on our Buildroot LTS (2025.02.x). Two candidate paths existed:
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(a) baseline on plan44's OpenWrt RV1106 fork (Linux 6.6, 152 RV1106 patches), or
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(b) forward-port the vendor tree directly onto a chosen upstream stable.
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## Decision
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Forward-port **directly to Linux 6.18.46** from vendor 5.10.160, carrying **no
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plan44/OpenWrt code**. Reuse the already-upstream **rv1126** register data where it
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matches the RV1106 ("RV-series lite" VOP, clk, pinctrl), and carry the RV1106
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deltas as a reviewable patch series in `patches/`.
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## Consequences
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- Done and **hardware-verified on `warden-c8a3`**: clk, pinctrl, eMMC, GMAC, TRNG,
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OTP, SARADC/TSADC, RTC, USB host, PWM/backlight, VOP display, GT911 touch, AIC8800
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wifi, RGA, I2S audio, HPMCU mailbox, open NPU driver, PVTM.
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- **uClibc stays required**: RGA/MPP/ISP/NPU userspace ship as uClibc-only
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blobs; a glibc swap breaks media (flare-edge #51, wontfix). Any kernel bump
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inherits this.
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- Kernel bumps risk struct-ABI breaks for out-of-tree modules (the AIC8800/VLAN
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`struct net_device` offset saga). Mitigation: ship one matched full boot+oem
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image, never a partial reflash.
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- Deferred by design: crypto-v3 accelerator (CPU crypto already covers the need),
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open NPU *compute* (a person-year register-RE effort, no RV1106 prior art).
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