docs: gxbb: Add documentation
Change-Id: Ie2465c1ccc482bd8eb5e5a71c580543095e4ba94
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/docs/plat/meson-gxbb.rst b/docs/plat/meson-gxbb.rst
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+Trusted Firmware-A for Amlogic Meson S905 (GXBB)
+================================================
+
+The Amlogic Meson S905 is a SoC with a quad core Arm Cortex-A53 running at
+1.5Ghz. It also contains a Cortex-M3 used as SCP.
+
+This port is a minimal implementation of BL31 capable of booting mainline U-Boot
+and Linux:
+
+- SCPI support.
+- Basic PSCI support (CPU_ON, CPU_OFF, SYSTEM_RESET, SYSTEM_OFF). Note that CPU0
+ can't be turned off, so there is a workaround to hide this from the caller.
+- GICv2 driver set up.
+- Basic SIP services (read efuse data, enable/disable JTAG).
+
+In order to build it:
+
+::
+
+ CROSS_COMPILE=aarch64-linux-gnu- make DEBUG=1 PLAT=gxbb bl31
+
+This port has been tested in a ODROID-C2. After building it, follow the
+instructions in the `U-Boot repository`_, replacing the mentioned **bl31.bin**
+by the one built from this port.
+
+.. _U-Boot repository: https://github.com/u-boot/u-boot/blob/master/board/amlogic/odroid-c2/README