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