docs: Add skeletal documentation of cubieboard

Add skeletal documentation of the cubieboard machine.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20210713142226.19155-2-peter.maydell@linaro.org
diff --git a/MAINTAINERS b/MAINTAINERS
index 814d103..1596b35 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -560,6 +560,7 @@
 F: hw/*/allwinner*
 F: include/hw/*/allwinner*
 F: hw/arm/cubieboard.c
+F: docs/system/arm/cubieboard.rst
 
 Allwinner-h3
 M: Niek Linnenbank <nieklinnenbank@gmail.com>
diff --git a/docs/system/arm/cubieboard.rst b/docs/system/arm/cubieboard.rst
new file mode 100644
index 0000000..344ff8c
--- /dev/null
+++ b/docs/system/arm/cubieboard.rst
@@ -0,0 +1,16 @@
+Cubietech Cubieboard (``cubieboard``)
+=====================================
+
+The ``cubieboard`` model emulates the Cubietech Cubieboard,
+which is a Cortex-A8 based single-board computer using
+the AllWinner A10 SoC.
+
+Emulated devices:
+
+- Timer
+- UART
+- RTC
+- EMAC
+- SDHCI
+- USB controller
+- SATA controller
diff --git a/docs/system/target-arm.rst b/docs/system/target-arm.rst
index 705b883..e2fcb64 100644
--- a/docs/system/target-arm.rst
+++ b/docs/system/target-arm.rst
@@ -85,6 +85,7 @@
    arm/aspeed
    arm/sabrelite
    arm/digic
+   arm/cubieboard
    arm/musicpal
    arm/gumstix
    arm/nrf