kernel: M3 DONE — full WardenOS boots on the self-built 6.18 kernel

Adding the eMMC dw_mmc node (mmc@ffa90000, clocks from cru + grf_cru) was all M3
needed. On warden-c8a3 the 6.18 kernel enumerates the eMMC at HS200
(mmcblk0 8GTF4R 7.28 GiB), mounts the ext4 rootfs, runs /sbin/init, and starts
every WardenOS daemon. Serial root login confirms:

  Linux warden-c8a3 6.18.46 armv7l
  ps: warden-flared warden-modbus warden-mikrotik warden-asic warden-ui warden-flight

Expected M4/M5 gaps are clean failures: the 5.10 aic8800 wifi/BT .ko won't load on
6.18 (vermagic), and no backlight/framebuffer yet (no VOP node). Next: M4 display,
M5 AIC8800 SDIO port, M6 the rest; plus a lean defconfig + Buildroot-on-6.18.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf

kernel/docs/m2-boot-on-c8a3.md

@@ -84,8 +84,19 @@ pre-MMU), then fixed:
 CP2102 bench adapter — so the M2 DT pins 115200 for readable bring-up; production
 overrides to 1.5M.
 
-## Next (M3)
+## M3 (same session): ✅ the full WardenOS runs on the 6.18 kernel
 
-The kernel mounts the 5.10 rootfs_b but the userspace/modules are 5.10 (vermagic
-mismatch). M3: lean RV1106 defconfig, `dw_mmc`/`sdhci` DT (eMMC already probes —
-`MMC0: HS200`), and our Buildroot userspace rebuilt on 6.18.
+Adding the eMMC `dw_mmc` node (`mmc@ffa90000`, clocks from cru + grf_cru) was the
+only change M3 needed — the mmc/ext4 drivers are already in-config. The kernel
+enumerated the eMMC at HS200, mounted the ext4 rootfs, ran `/sbin/init`, and
+started every WardenOS daemon. A serial root login confirms `uname -a` →
+`Linux warden-c8a3 6.18.46 armv7l`, with `warden-flared/-modbus/-mikrotik/-asic/
+-ui/-flight` all running. Expected M4/M5 gaps show cleanly: the 5.10 aic8800 `.ko`
+won't load (vermagic → M5), and there's no backlight/framebuffer yet (→ M4).
+
+**Console lesson applied:** with `console=ttyS2,115200` the whole boot is readable
+on the CP2102 (the 1.5M vendor rate is garbage on it). Serial login uses the same
+`c8a3_run.py` [bench-creds] helper as the 5.10 firmware — the userspace is unchanged.
+
+Next: M4 (VOP2 display + panel + touch), M5 (AIC8800 SDIO port + our 4 patches),
+M6 (RGA/watchdog/HPMCU/USB-OTG); plus a lean defconfig + Buildroot-on-6.18 cleanup.

kernel/rv1106-enablement/PORT-STATUS.md

@@ -95,11 +95,35 @@ Three bring-up bugs were found and fixed on hardware, all captured in the DT:
 comes up far enough to clock the UART and the arch timer on hardware. A wrong CPU
 mux/PLL would show later (cpufreq / peripheral rates), still to be checked.
 
-## M3 — rootfs boot: NEXT
-The M2 kernel mounts the 5.10 WardenOS rootfs_b but the userspace/module vermagic
-mismatches (5.10 `.ko` won't load on 6.18). M3 = a lean RV1106 defconfig (drop
-multi_v7), `dw_mmc`/`sdhci` DT wired to our CRU (eMMC already probes — `MMC0: HS200`),
-and our Buildroot userspace rebuilt against 6.18. Then M4 display, M5 wifi, M6 rest.
+## M3 — rootfs boot: ✅ DONE — the full WardenOS runs on the 6.18 kernel (2026-08-24)
+Adding the eMMC (`dw_mmc`) node to the DT was all M3 needed — the drivers are already
+in the config. On hardware:
+```
+dwmmc_rockchip ffa90000.mmc: Version ID is 270a       ← our dw_mmc bound
+mmc0: new HS200 MMC card ... mmcblk0: 8GTF4R 7.28 GiB  ← eMMC at HS200 (198 MHz)
+mmcblk0: p1(env)...p10(rootfs_b)...p12(userdata)      ← partitions enumerated
+EXT4-fs (mmcblk0p10): mounted ... VFS: Mounted root    ← ext4 rootfs mounted
+Run /sbin/init as init process
+Starting warden-modbus / -mikrotik / -asic / -flared / Warden UI
+```
+A root shell over the serial console confirms it: `uname -a` → **`Linux warden-c8a3
+6.18.46 armv7l`**, with `warden-flared`, `warden-modbus`, `warden-mikrotik`,
+`warden-asic`, `warden-ui`, `warden-flight` all in `ps`. The eMMC node's ciu-drive/
+ciu-sample clocks come from `grf_cru`, so the M2 grf-cru fix was a prerequisite.
+
+The expected M4/M5 gaps show as clean failures: the out-of-tree 5.10 `aic8800`
+wifi/BT `.ko` won't load on 6.18 (vermagic — needs the driver ported, **M5**), and
+`warden-ui: no backlight device` (no display/VOP node yet — **M4**).
+
+## M4/M5/M6 — NEXT
+- **M4 display**: VOP2 + the RGB666 720×720 panel + GT911 touch + PWM backlight →
+  the LVGL UI renders (the UI process already runs, it just has no framebuffer).
+- **M5 wifi**: port the AIC8800 SDIO driver to 6.18 (+ the Tier-1 fix) so wlan0/usb0
+  come back; re-apply our 4 kernel patches.
+- **M6**: RGA, watchdog, HPMCU coprocessor, USB-OTG dual role.
+- **Cleanup**: a lean RV1106 defconfig to replace multi_v7 (shrinks the image, retires
+  the fdt-high workaround) + our Buildroot userspace rebuilt on 6.18 (retires the
+  vermagic-mismatched modules).
 
 ## Upstream tracking (decision 2026-08-23)
 Base stays the vendor forward-port (applies to 6.18; we control it). The unmerged upstream

kernel/rv1106-enablement/dts/rv1106-warden-m2.dts

@@ -39,9 +39,8 @@
 		stdout-path = "serial2:115200n8";
 		/*
 		 * earlycon with no baud = reuse the divisor the bootloader left in
-		 * uart2, so the first prints work regardless of our clock tree. The ttyS console is
-		 * pinned to 115200 to stay readable on the CP2102 bench adapter;
-		 * production WardenOS uses 1.5M.
+		 * uart2, so the first prints work regardless of our clock tree. The
+		 * ttyS console rate (1.5M) is PORT-VERIFY against the board.
 		 */
 		bootargs = "earlycon=uart8250,mmio32,0xff4c0000 console=ttyS2,115200n8 earlyprintk rootwait";
 	};
@@ -123,4 +122,24 @@
 		clock-names = "baudclk", "apb_pclk";
 		status = "okay";
 	};
+
+	/* M3: the eMMC (dw_mmc). Lets the kernel enumerate mmcblk0 and mount an
+	 * ext4 rootfs. ciu-drive/ciu-sample clocks come from grf_cru, so the
+	 * grf-clock-controller node above is a hard dependency. */
+	emmc: mmc@ffa90000 {
+		compatible = "rockchip,rv1106-dw-mshc", "rockchip,rk3288-dw-mshc";
+		reg = <0xffa90000 0x4000>;
+		interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru HCLK_EMMC>, <&cru CCLK_SRC_EMMC>,
+			 <&grf_cru SCLK_EMMC_DRV>, <&grf_cru SCLK_EMMC_SAMPLE>;
+		clock-names = "biu", "ciu", "ciu-drive", "ciu-sample";
+		fifo-depth = <0x100>;
+		max-frequency = <200000000>;
+		rockchip,use-v2-tuning;
+		bus-width = <8>;
+		non-removable;
+		cap-mmc-highspeed;
+		mmc-hs200-1_8v;
+		status = "okay";
+	};
 };