[PATCH 3/5] docs/system: Document Arm Versatile Express boards

[Peter Maydell]

Provide a minimal documentation of the Versatile Express boards
(vexpress-a9, vexpress-a15).

Signed-off-by: Peter Maydell <address@hidden>
---
 docs/system/arm/vexpress.rst | 60 ++++++++++++++++++++++++++++++++++++
 docs/system/target-arm.rst   |  1 +
 MAINTAINERS                  |  1 +
 3 files changed, 62 insertions(+)
 create mode 100644 docs/system/arm/vexpress.rst

diff --git a/docs/system/arm/vexpress.rst b/docs/system/arm/vexpress.rst
new file mode 100644
index 00000000000..7f1bcbef078
--- /dev/null
+++ b/docs/system/arm/vexpress.rst
@@ -0,0 +1,60 @@
+Arm Versatile Express boards (``vexpress-a9``, ``vexpress-a15``)
+================================================================
+
+QEMU models two variants of the Arm Versatile Express development
+board family:
+
+- ``vexpress-a9`` models the combination of the Versatile Express
+  motherboard and the CoreTile Express A9x4 daughterboard
+- ``vexpress-a15`` models the combination of the Versatile Express
+  motherboard and the CoreTile Express A15x2 daughterboard
+
+Note that as this hardware does not have PCI, IDE or SCSI,
+the only available storage option is emulated SD card.
+
+Implemented devices:
+
+- PL041 audio
+- PL181 SD controller
+- PL050 keyboard and mouse
+- PL011 UARTs
+- SP804 timers
+- I2C controller
+- PL031 RTC
+- PL111 LCD display controller
+- Flash memory
+- LAN9118 ethernet
+
+Unimplemented devices:
+
+- SP810 system control block
+- PCI-express
+- USB controller (Philips ISP1761)
+- Local DAP ROM
+- CoreSight interfaces
+- PL301 AXI interconnect
+- SCC
+- System counter
+- HDLCD controller (``vexpress-a15``)
+- SP805 watchdog
+- PL341 dynamic memory controller
+- DMA330 DMA controller
+- PL354 static memory controller
+- BP147 TrustZone Protection Controller
+- TrustZone Address Space Controller
+
+Other differences between the hardware and the QEMU model:
+
+- QEMU will default to creating one CPU unless you pass a different
+  ``-smp`` argument
+- QEMU allows the amount of RAM provided to be specified with the
+  ``-m`` argument
+- QEMU defaults to providing a CPU which does not provide either
+  TrustZone or the Virtualization Extensions: if you want these you
+  must enable them with ``-machine secure=on`` and ``-machine
+  virtualization=on``
+- QEMU provides 4 virtio-mmio virtio transports; these start at
+  address ``0x10013000`` for ``vexpress-a9`` and at ``0x1c130000`` for
+  ``vexpress-a15``, and have IRQs from 40 upwards. If a dtb is
+  provided on the command line then QEMU will edit it to include
+  suitable entries describing these transports for the guest.
diff --git a/docs/system/target-arm.rst b/docs/system/target-arm.rst
index d1196cbe01c..4779293d731 100644
--- a/docs/system/target-arm.rst
+++ b/docs/system/target-arm.rst
@@ -73,6 +73,7 @@ undocumented; you can get a complete list by running
    arm/integratorcp
    arm/realview
    arm/versatile
+   arm/vexpress
    arm/musicpal
    arm/nseries
    arm/orangepi
diff --git a/MAINTAINERS b/MAINTAINERS
index 1f84e3ae2c6..74cff1c3818 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -826,6 +826,7 @@ M: Peter Maydell <address@hidden>
 L: address@hidden
 S: Maintained
 F: hw/arm/vexpress.c
+F: docs/system/arm/vexpress.rst
 
 Versatile PB
 M: Peter Maydell <address@hidden>
-- 
2.20.1