Add documentation for ODROID-M1S (#3179)

Documentation/boards/README.md

@@ -13,6 +13,7 @@ The following boards/devices are supported:
   - [ODROID-C2](https://www.hardkernel.com/shop/odroid-c2/) (discontinued)
   - [ODROID-C4](https://www.hardkernel.com/shop/odroid-c4/)
   - [ODROID-M1](https://www.hardkernel.com/shop/odroid-m1/)
+  - ODROID-M1S [4 GB](https://www.hardkernel.com/shop/odroid-m1s-with-4gbyte-ram/) or [8 GB](https://www.hardkernel.com/shop/odroid-m1s-with-8gbyte-ram/)
   - [ODROID-N2](https://www.hardkernel.com/shop/odroid-n2/) (discontinued)
   - ODROID-N2+ [2 GB](https://www.hardkernel.com/shop/odroid-n2-with-2gbyte-ram-2/) or [4 GB](https://www.hardkernel.com/shop/odroid-n2-with-4gbyte-ram-2/)
   - [ODROID-XU4](https://www.hardkernel.com/shop/odroid-xu4-special-price/)
@@ -47,6 +48,7 @@ Notes:
 |ODROID-C2     |`make odroid_c2`     |[odroid_c2](../../buildroot-external/configs/odroid_c2_defconfig)|[hardkernel](./hardkernel/)|
 |ODROID-C4     |`make odroid_c4`     |[odroid_c4](../../buildroot-external/configs/odroid_c4_defconfig)|[hardkernel](./hardkernel/)|
 |ODROID-M1     |`make odroid_m1`     |[odroid_m1](../../buildroot-external/configs/odroid_m1_defconfig)|[hardkernel](./hardkernel/)|
+|ODROID-M1S    |`make odroid_m1s`    |[odroid_m1s](../../buildroot-external/configs/odroid_m1s_defconfig)|[hardkernel](./hardkernel/)|
 |ODROID-N2/N2+ |`make odroid_n2`     |[odroid_n2](../../buildroot-external/configs/odroid_n2_defconfig)|[hardkernel](./hardkernel/)|
 |ODROID-XU4    |`make odroid_xu4`    |[odroid_xu4](../../buildroot-external/configs/odroid_xu4_defconfig)|[hardkernel](./hardkernel/)|
 |Tinker Board  |`make tinker`        |[tinker](../../buildroot-external/configs/tinker_defconfig)|[asus](./asus/)|

Documentation/boards/hardkernel/odroid-m1s.md

@@ -0,0 +1,50 @@
+# ODROID-M1S
+
+Home Assistant OS 12 and newer support the ODROID-M1S board.
+
+## SD-card
+
+SD-card boot is supported only if you have erased Petitboot from eMMC.
+
+## eMMC
+
+To install to eMMC via on-board Petitboot bootloader:
+
+1. Download [`ODROID-M1S_EMMC2UMS.img`][1]
+2. Use balenaEtcher or another tool to flash the UMS utility onto an SD card.
+3. Plug-in that SD card to your ODROID-M1S and boot it. Connect your PC to the Micro USB OTG port.
+4. The eMMC will show as a drive on your PC and you can directly flash the HAOS image with balenaEther.
+
+Installing HAOS erases Petitboot, if you wish to return to any official Hardkernel images then short the maskRom pads near
+the 40pin connector while booting from a [Hardkernel recovery image][2].
+
+## NVMe
+
+Booting directly from NVMe is not supported. The NVMe card can be used as a data disk.
+
+## Technical notes on boot flow
+
+The Home Assistant OS image is bootable by the SoC directly. This means that no help from the Hardkernel provided and pre-installed bootloader Petitboot is necessary. Petitboot is stored on the eMMC and will be erased when installing HAOS.
+
+## Console
+
+By default, console access is available on the serial header (UART) and on HDMI.
+The serial console's baudrate is 1500000 by default.
+
+The systemd startup messages will only appear on the serial console by default.
+To show the messages on the HDMI console instead, add the console manually
+to the `cmdline.txt` file on the boot partition (e.g. `console=tty0`).
+
+## GPIO
+
+Odroid-M1S introduces a new 14pin expansion header. Refer to [the odroid wiki][3].
+At this point not all functionality is supported by the upstream kernel used by Home Assistant OS.  
+Supported modules include:
+- UPS
+- Internal USB
+- Mini IO board (partial support)
+
+
+[1]: https://dn.odroid.com/RK3566/ODROID-M1S/Installer/ODROID-M1S_EMMC2UMS.img
+[2]: https://wiki.odroid.com/odroid-m1s/getting_started/os_installation_guide
+[3]: https://wiki.odroid.com/odroid-m1s/hardware/expansion_connectors

Documentation/kernel.md

@@ -18,6 +18,7 @@ Default Kernel tree: 6.1
 | ODROID-C2 | 6.6.16 |
 | ODROID-C4 | 6.6.16 |
 | ODROID-M1 | 6.6.16 |
+| ODROID-M1S | 6.6.16 |
 | ODROID-N2 | 6.6.16 |
 | ODROID-XU4 | 6.6.16 |
 | Generic aarch64 | 6.6.16 |