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Provide a minimal documentation of the Versatile Express boards (vexpress-a9, vexpress-a15). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20200507151819.28444-4-peter.maydell@linaro.org
61 lines
1.9 KiB
ReStructuredText
61 lines
1.9 KiB
ReStructuredText
Arm Versatile Express boards (``vexpress-a9``, ``vexpress-a15``)
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================================================================
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QEMU models two variants of the Arm Versatile Express development
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board family:
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- ``vexpress-a9`` models the combination of the Versatile Express
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motherboard and the CoreTile Express A9x4 daughterboard
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- ``vexpress-a15`` models the combination of the Versatile Express
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motherboard and the CoreTile Express A15x2 daughterboard
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Note that as this hardware does not have PCI, IDE or SCSI,
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the only available storage option is emulated SD card.
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Implemented devices:
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- PL041 audio
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- PL181 SD controller
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- PL050 keyboard and mouse
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- PL011 UARTs
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- SP804 timers
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- I2C controller
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- PL031 RTC
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- PL111 LCD display controller
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- Flash memory
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- LAN9118 ethernet
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Unimplemented devices:
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- SP810 system control block
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- PCI-express
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- USB controller (Philips ISP1761)
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- Local DAP ROM
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- CoreSight interfaces
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- PL301 AXI interconnect
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- SCC
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- System counter
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- HDLCD controller (``vexpress-a15``)
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- SP805 watchdog
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- PL341 dynamic memory controller
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- DMA330 DMA controller
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- PL354 static memory controller
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- BP147 TrustZone Protection Controller
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- TrustZone Address Space Controller
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Other differences between the hardware and the QEMU model:
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- QEMU will default to creating one CPU unless you pass a different
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``-smp`` argument
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- QEMU allows the amount of RAM provided to be specified with the
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``-m`` argument
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- QEMU defaults to providing a CPU which does not provide either
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TrustZone or the Virtualization Extensions: if you want these you
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must enable them with ``-machine secure=on`` and ``-machine
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virtualization=on``
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- QEMU provides 4 virtio-mmio virtio transports; these start at
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address ``0x10013000`` for ``vexpress-a9`` and at ``0x1c130000`` for
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``vexpress-a15``, and have IRQs from 40 upwards. If a dtb is
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provided on the command line then QEMU will edit it to include
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suitable entries describing these transports for the guest.
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