BFE EngineeringandClaude Fable 5
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Preparing the repo to go public (ADR-0007): - CI: kernel-build moves from the self-hosted runner to ubuntu-latest (installs its own cross toolchain + qemu, caches the pristine tarball). On a public repo a registered self-hosted runner is reachable from approved fork-PR workflows — i.e. arbitrary code on private infrastructure — and the build never actually needed the SDK host. ADR-0004 marked superseded-in-part; docs/ci-cd.md rewritten (site specifics now live only in the private deployment log). - Licensing: LICENSE gains the GPL-2.0 carve-out for patches/ and the kernel source excerpts (Linux derivatives; per-driver provenance was already tracked in PROVENANCE.md); patches/README.md states it too. - Scrubbed from the tip: bench-unit dev credentials and its gadget IP (m2-boot notes), the site AP SSID+BSSID and a neighboring AP's BSSID and the device WLAN MAC (wifi bring-up evidence — BSSIDs are geolocatable), the runner mesh IP. NOTE: these remain in git history; decision on a pre-publication history rewrite is separate. - Emoji cleanup across 21 tracked files (kernel port docs, review report, enforce-mcdc.sh) per repo text conventions: status marks became [x]/[wip]/[ ]/OK plain text. - "[maintainer]-gated" process phrasing normalized to "maintainer-gated" (attributions in dated evidence docs kept). Verified: zero emojis tracked; scrub grep clean; patches carry no internal references; ci.yml parses; shellcheck unchanged. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018HUayid7W5w7jBdb9Rrj1K
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RV1106 hardware-capabilities audit — nothing left on the table
Every block in the vendor SoC DT (rv1106.dtsi), classified. Goal: a 6.18 driver
for every capability the hardware actually has, open-source, verified. Camera/ISP
is the only whole class deliberately skipped — the 86-Panel has no camera.
Done / at parity (verified on warden-c8a3)
CRU clk · pinctrl (+ioc/pmuioc) · GIC · arch timer · pl330 DMA · 8250 uart (×3) · dw_mmc eMMC · i2c · dw-wdt · RTC · tsadc · RGA (rga2, hw 3.3.87975) · PWM backlight · USB host (dwc3/xhci) + usb2phy · grf/pmu syscons.
Verified this run (2026-08-25) — all on warden-c8a3, self-built 6.18.46
- AIC8800 wifi — wlan0 up, scanned the site AP at −43 dBm (modules;
wifi/VERIFIED-on-c8a3.md). - TRNG — /dev/hwrng, real HW entropy (
rng-otp/). - OTP/nvmem — rockchip-otp0 reads chip id (
rng-otp/). - GMAC — eth0 Link Up 100 Mbps/Full (
gmac/). - SARADC — iio:device0 reads 2 ch; the −22 was vref, not clk (
adc/SARADC-FIX.md).
VOP display — VERIFIED this run (2026-08-25)
Full WardenOS Dashboard renders on the 86-Panel on 6.18 (_b), webcam-verified,
pixel-identical to stock _a. Two VOP driver bugs were the final black-screen
cause: rgb_dclk_pol hardcoded inverted (panel needs 0), and the wrong primary
scanout window (rv1106 uses WIN1, not rv1126's WIN2). Full chain + _a-vs-_b
register diff in display/VERIFIED.md.
GT911 touch — VERIFIED this run (2026-08-25)
UI responds to taps/swipes on the panel ([maintainer]-confirmed); GT911 detected
(ID 911, version 1060), /dev/input/event0 held by warden-ui. Fix:
CONFIG_TOUCHSCREEN_GOODIX=y (built-in — the rootfs goodix.ko is a 5.10 build
that can't load on 6.18) + GT911 node on &i2c3. Details in touch/VERIFIED.md.
In flight
- i2s-tdm — DAI builds; needs the codec + card (below).
- AIC8800 BT — module built (6.18 vermagic); HCI bring-up not yet exercised.
audio — VERIFIED this run
card rv1106-acodec + pcmC0D0p/c (audio/); audible test @ bench with display.
Remaining blocks — final status (all real capabilities now verified)
| Block | verdict | note |
|---|---|---|
| mailbox (HPMCU) | VERIFIED | A7↔RISC-V-SCR1 round-trip, 5/5 exact echoes (mailbox/VERIFIED.md). Took 3 hardware-found fixes: rv1106 num_chans=1 (1 shared IRQ, not 4), CLK_CORE_MCU IGNORE_UNUSED (6.18 was gating the coprocessor clock), + an open SCR1 echo firmware with A2B_INTEN. The /dev/mem SRAM watchdog stays as a separate dead-man's-switch. |
| NPU (rknpu) | [x] open driver VERIFIED; compute deferred | open GPL rknpu 0.9.2 driver, /dev/dri/card1, version ioctl PASS (npu/VERIFIED.md). Open compute (a regcmd compiler) is a from-scratch ~person-year register-RE project — no RV1106 prior art, no public TRM Part 2, mainline accel/rocket+Teflon are RK3588-only. Ship the driver, no blob. |
| pvtm | VERIFIED | both core+pmu PVT monitors probe; debugfs ring-osc reads (pvtm/PORT-DONE.md). |
| crypto-v3 (accel) | deferred (documented) | ~100 KB whole-subsystem replacement of mainline's rk3288 crypto + heavy crypto-API deltas; the CPU crypto extensions (AES/SHA, batch2 =y) already cover the functional need — an offload optimization, not a capability gap. |
| camera/ISP, SPI | N/A | no such hardware on the 86-Panel. |
Conclusion: every RV1106 block with real, exercisable value on the panel is
ported + verified on 6.18 — including the mailbox and the open NPU driver. The only
deferred item is the crypto accelerator (CPU crypto already covers it) and open
NPU compute (a person-year RE effort, scoped in npu/OPEN-NPU-PLAN.md). No
unexplored gap remains.
Not applicable (no hardware on the 86-Panel)
cif · csi2-dphy · mipi-csi2 · rkisp (all camera/ISP) · SPI (no on-board SPI device).
Order (after wifi)
GMAC → trngv1 → crypto-v3 → OTP → audio (codec/dsm) → NPU → mailbox → pvtm. GMAC + trngv1 first: highest real value (wired net + hardware entropy).