Re: Parameter 'driver' expects pluggable device type

[Priyamvad Acharya <priyamvad.agnisys@gmail.com>]

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Hi,
I have set user_creatable to true in class_init function of pl061 source
code.
Now when I run qemu via command line with *-device *option it gives below
output

> qemu-system-arm: Device pl061 can not be dynamically instantiated
>


I request community members to reply asap!!!!!!!!!!!!!!!



On Fri, 8 May 2020 at 07:40, Priyamvad Acharya <priyamvad.agnisys@gmail.com>
wrote:

> Hi,
> Thanks for providing relevant information.
> FYI
> I am using Qemu version *4.2.94 (v5.0.0-rc4-dirty).*
> I am using *virt* board.
>
> Where we need to set *user creatable *to true?
> Any other modification is needed to allow sysbus device support?
>
> Below is the script which I am using  to boot linux image with pl061
> device on virt board.
>
> #!/bin/bash
>>
>> KERNEL="/lhome/priyamvad/debian_qemu_arm32/vmlinuz-3.16.0-6-armmp-lpae"
>>
>> INIT_IMAGE="/lhome/priyamvad/debian_qemu_arm32/initrd.img-3.16.0-6-armmp-lpae"
>> DISK="/lhome/priyamvad/debian_qemu_arm32/hda30.qcow2"
>>
>> ./qemu-system-arm \
>> -M virt \
>> -m 1024 \
>> -smp 4 \
>> -kernel $KERNEL \
>> -object rng-random,filename=/dev/urandom,id=rng0 \
>> -device virtio-rng-device,rng=rng0 \
>> -initrd $INIT_IMAGE \
>> -append 'root=/dev/vda2' \
>> -drive if=none,file=$DISK,format=qcow2,id=hd \
>> -device pl061 \
>> -device virtio-blk-device,drive=hd \
>> -device virtio-net-device,netdev=usernet \
>> -netdev user,id=usernet,hostfwd=tcp::2222-:22 \
>> -nographic
>>
>
> Is the above script  correct  to boot linux image with pl061 device on
> virt board?
>
> On Fri, 8 May 2020 at 02:32, John Snow <jsnow@redhat.com> wrote:
>
>>
>>
>> On 5/6/20 8:56 AM, Priyamvad Acharya wrote:
>> >
>> > Hello developer community,
>> > I want to allow a *sysbus *type device to boot with kernel image(arm
>> > architecture) via Qemu command line .
>> >
>> > When I run qemu arm system executable with *-device *option via qemu
>> > command line,I get following error message
>> >
>> >> qemu-system-arm: -device pl061: Parameter 'driver' expects pluggable
>> > device type
>> >
>> > So, how to allow a sysbus device via command line?
>> > Is there any working patch?
>>
>> Hi, it looks like the pl061 device is not declared "user creatable" so
>> it is unavailable from the CLI. As a sysbus device, QEMU is not aware,
>> in the abstract, of how to "connect" the device to other devices.
>>
>> See the sysbus class initialization code for more detail:
>> https://github.com/qemu/qemu/blob/master/hw/core/sysbus.c#L301
>>
>>
>> However, It looks like these boards/devices create such a device:
>>
>> hw/arm/highbank
>> hw/arm/realview
>> hw/arm/sbsa-ref
>> hw/arm/stellaris
>> hw/arm/versatilepb
>> hw/arm/virt
>>
>> If you want one on some other kind of machine, you'll need to write it
>> up yourself in the machine board code, but you didn't tell us what
>> version of QEMU you're using, what machine type you are trying to use,
>> etc.
>>
>> --js
>>
>>

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