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
>
>