[Qemu-devel] Isochronous devices support in QEMU

[Qemu-devel] Isochronous devices support in QEMU

[Taimoor Mirza]

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Hi all,

 

I've few questions about QEMU:

 

1) I read in QEMU's official documentation that in case of using host system devices "USB devices requiring real time streaming (i.e. USB Video Cameras) are not supported yet". Also there is no isochronous transfer based virtual USB device in QEMU. I want to know what is current status of Iso. support in QEMU? Can I test my Linux based USB host application for ARM with physical iso devices in host USB port? 

 

2) I found a function "ohci_service_iso_td" in usb-ohci.c file in QEMU source code.

 

3) I am developing a Linux based USB device using Gadget API. Does QEMU provide USB function controller emulation in such a way that I can run plug this USB device at run time with host machine and can test it?

 

Regards,

Taimoor
 		 	   		  
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Re: [Qemu-devel] Isochronous devices support in QEMU

[David S. Ahern]

David Ahern


On 02/22/2010 12:32 AM, Taimoor Mirza wrote:
> Hi all,
>  
> I've few questions about QEMU:
>  
> 1) I read in QEMU's official documentation that in case of using host
> system devices "USB devices requiring real time streaming (i.e. USB
> Video Cameras) are not supported yet". Also there is no isochronous
> transfer based virtual USB device in QEMU. I want to know what is
> current status of Iso. support in QEMU? Can I test my Linux based USB

As of commit 8e65b7c04965c8355e4ce43211582b6b83054e3d I have been able
to pass audio devices to a VM with good success (though I use qemu-kvm,
not just qemu).

I just started looking at web cameras and not having much luck yet.

David


> host application for ARM with physical iso devices in host USB port?
>  
> 2) I found a function "ohci_service_iso_td" in usb-ohci.c file in QEMU
> source code.
>  
> 3) I am developing a Linux based USB device using Gadget API. Does QEMU
> provide USB function controller emulation in such a way that I can run
> plug this USB device at run time with host machine and can test it?
>  
> Regards,
> Taimoor
> 
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