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

["Alex Bennée" <alex.bennee@linaro.org>]

Peter Maydell <peter.maydell@linaro.org> writes:

> Provide a minimal documentation of the Versatile Express boards
> (vexpress-a9, vexpress-a15).
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  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.

TIL ;-)

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée