[meta-xilinx] [PATCH v1] qemuzynmp: Add the qemuzynqmp machine

[Alistair Francis]

On Tue, Jun 14, 2016 at 7:11 AM, Nathan Rossi <nathan at nathanrossi.com> wrote:
> On Tue, Jun 14, 2016 at 2:25 AM, Alistair Francis
> <alistair.francis at xilinx.com> wrote:
>> On Tue, May 17, 2016 at 9:40 AM, Alistair Francis
>> <alistair.francis at xilinx.com> wrote:
>>> On Tue, May 17, 2016 at 6:27 AM, Nathan Rossi <nathan at nathanrossi.com> wrote:
>>>> On Tue, May 17, 2016 at 8:20 AM, Alistair Francis
>>>> <alistair.francis at xilinx.com> wrote:
>>>>> On Mon, May 16, 2016 at 9:39 AM, Alistair Francis
>>>>> <alistair.francis at xilinx.com> wrote:
>>>>>> On Sun, May 15, 2016 at 10:10 AM, Peter Crosthwaite
>>>>>> <crosthwaitepeter at gmail.com> wrote:
>>>>>>> On Sun, May 15, 2016 at 1:17 AM, Nathan Rossi <nathan at nathanrossi.com> wrote:
>>>>>>>> On Sat, May 14, 2016 at 2:54 AM, Alistair Francis
>>>>>>>> <alistair.francis at xilinx.com> wrote:
>>>>>>>>> On Fri, May 13, 2016 at 2:35 AM, Nathan Rossi <nathan at nathanrossi.com> wrote:
>>>>>>>>>> On Fri, May 13, 2016 at 6:11 AM, Alistair Francis
>>>>>>>>>> <alistair.francis at xilinx.com> wrote:
>>>>>>>>>>> Add the qemuzynqmp machine based on the physical ZCU02 revB board.
>>>>>>>>>>
>>>>>>>>>> Hi Alistair,
>>>>>>>>>>
>>>>>>>>>> So I am a little confused, is this machine supposed to emulate the
>>>>>>>>>> ep108 (the args to QEMU appear to be for the ep108) or the zcu102? or
>>>>>>>>>> are both able to be emulated?
>>>>>>>>>
>>>>>>>>> Hey Nathan,
>>>>>>>>>
>>>>>>>>> This machine is supposed to be emulating the ZCU102.
>>>>>>>>>
>>>>>>>>> At the moment we only have the EP108 in upstream QEMU. It isn't worth
>>>>>>>>> adding a ZCU102 model upstream yet as at the moment we don't have
>>>>>>>>> enough modeled upstream to notice any differences between the boards.
>>>>>>>>
>>>>>>>> Ah ok, so in the future QEMU will have models for both the EP108 and
>>>>>>>> the ZCU102 boards. In that case I don't actually see a need for a
>>>>>>>> 'qemuzynqmp' machine, since the ep108-zynqmp already provides the
>>>>>>>> setup for QEMU. The same can be done for the zcu102-zynqmp board, this
>>>>>>>> would also make it easier to maintain consistency (aka changes only
>>>>>>>> need to be made to the zcu102-zynqmp machine).
>>>>>>>>
>>>>>>>
>>>>>>> +1, qemuzynq as well as the "zynq" machine model in upstream QEMU are
>>>>>>> legacy convention that we should replace with concrete boards going
>>>>>>> forward.
>>>>>>
>>>>>> Ok, I'll look into adding a ZCU102 machine similar to what we do for the EP108.
>>>>>
>>>>> How can I run the EP108 on QEMU? I can't find how I can start QEMU with Yocto.
>>>>
>>>> There is no runqemu support though the ep108 machine is setup to build
>>>> qemu-native for use. But there was a guide created back when first
>>>> adding zynqmp, essentially it is manually running QEMU with the
>>>> correct args. http://www.wiki.xilinx.com/Yocto+for+zynqmp
>>>
>>> Ok, but I'm looking for adding runqemu support to Yocto. The way that
>>> everyone else seems to do it is by architecture and not by board so I
>>> think that is my only option.
>>>
>>> Do you have a better idea of adding runqemu support?
>>
>> This has been accepted in poky master branch with this commit:
>> commit ff3bc6c61f5946aa5e91a77442d828ec1a03387d
>> Author: Alistair Francis <alistair.francis at xilinx.com>
>> Date:   Thu May 12 14:37:39 2016 -0700
>>
>>     runqemu: Add suport for qemuzynqmp
>>
>>     (From OE-Core rev: d2a7c1db9bff6ae3844e3d017e94f29d1501bf57)
>>
>>     Signed-off-by: Alistair Francis <alistair.francis at xilinx.com>
>>     Signed-off-by: Ross Burton <ross.burton at intel.com>
>>     Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
>>
>>
>> Can we work on merging this in meta-xilinx now?
>
> I will accept the addition of this machine given that it will only
> exist for the purposes of runqemu, and it will be removed in the
> future once runqemu is able to handle using the actual machine
> targets. But there should be no specific configuration/overrides for
> this machine, it should be equivalent to the target QEMU model, in
> this case ep108-zynqmp.

Agreed! I would much rather have EP108 and ZCU102 machines which can
boot on QEMU, but that doesn't seem to be how the rest of Yocto works.

>
> But between this patch, your patch to runqemu and that with qemu 2.6.0
> zynqmp does not boot correctly. I don't see a point in merging this
> addition until all parts are working as expected. This means that
> runqemu should be setup to direct boot the kernel, as this works fine
> with qemu 2.5 (and should also work fine with 2.6 once the cpu bring
> up issue is resolved).

How are you testing with QEMU 2.6? I am unable to build images with
meta-xilinx and poky both at master.

Thanks,

Alistair

>
> ---
>
> With regards to this patch, please change it so that it is just
> including the ep108 machine. Something like the following in
> qemuzynqmp.conf.
>
> MACHINEOVERRIDES =. "ep108-zynqmp:"
> require conf/machine/ep108-zynqmp.conf
>
> As for setting the "QEMU_DTB", this can be set in the ep108 conf. I
> would also suggest using the kernel_devicetree/imagetype to set it.
>
> QEMU_DTB = "${KERNEL_IMAGETYPE}-${@os.path.splitext(os.path.basename(d.getVar("KERNEL_DEVICETREE",
> True)))[0]}"
>
> As for the kernel changes, that kernel config is broken for QEMU.
>
> Regards,
> Nathan
> --
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