Hi Marcin,
Hope you have compiled the qemu with virtfs enabled.i.e --enable-virtfs
And the cli looks like this. But I am working on x86 not ARM.
-fsdev local,id=root,path=${ROOTFS},security_model=none,writeout=immediate
-device virtio-9p-pci,fsdev=root,mount_tag=/dev/root
-Regards,
Pradeep
On 27 September 2016 at 21:33, mar.krzeminski <mar.krzemin...@gmail.com>
wrote:
> So for some reason kernel expect that 9pfs channel will be named /dev/root
> (root= seem to be ignored).
> Working command line:
>
> Kernel: /root=/dev/root rootfstype=9p rootflags=trans=virtio rw/
> Qemu: /-device virtio-9p-device,fsdev=host_fs,mount_tag=/dev/root -fsdev
> local,id=host_fs,security_model=none,path=////work/rootfs/
> /
> Thanks,
> Marcin/
> /
> W dniu 23.09.2016 o 21:41, mar.krzeminski pisze:
>
> And most important, while mounting as roots, error is:
>>
>> [ 1.086235] device: '9p-1': device_add
>> [ 1.087859] 9pnet_virtio: no channels available
>> [ 1.091619] device: '9p-1': device_unregister
>> [ 1.092783] device: '9p-1': device_create_release
>> [ 1.093534] VFS: Cannot open root device "host" or unknown-block(0,0):
>> error -2
>>
>> Thanks,
>> Marcin
>>
>> W dniu 23.09.2016 o 21:38, mar.krzeminski pisze:
>>
>>> Hello,
>>>
>>> I have a problem in my custom arm machine to use 9p fs as a rootfs.
>>>
>>> 9p command line i qemu:
>>>
>>> /-device virtio-9p-device,fsdev=host_fs,mount_tag=hostfs -fsdev
>>> local,id=host_fs,security_model=none,path=/work/rootfs/
>>>
>>> Kernel cmd line:
>>>
>>> /--append "root=hostfs rootfstype=9p rootflags=trans=virtio noinitrd
>>> console=ttyS3,115200"
>>>
>>> /Device tree entry:
>>>
>>> / virtio: virtio_mmio@ff0a4000 {//
>>> // compatible = "virtio,mmio";//
>>> // reg = <0xff0a4000 0x200>;//
>>> // interrupts = <0 72 1>;//
>>> // status = "okay";//
>>> // };
>>>
>>>
>>> / I can mount this fs from kernel using fstab entry:
>>> /hostfs /mnt/host 9p trans=virtio 0 0
>>>
>>> /Do you have any idea what am I doing wrong?
>>>
>>> Thanks,
>>> Marcin/
>>> /
>>>
>>
>>
>
