[Qemu-devel] Problems bringing up network in qemu-system-arm

[Qemu-devel] Problems bringing up network in qemu-system-arm

[Wolfgang Schildbach]

Hi everyone,

I am using the current CVS (HEAD) version of qemu running on x86 linux, 
and am using it to emulate an ARM on the integrator board, running 
arm-linux, using arm-test-0.1.tar.gz.

>From what I've read in this list (
http://lists.gnu.org/archive/html/qemu-devel/2005-12/msg00137.html), it 
should be possible to set up a network, user-mode or TUN/TAP. However, I 
fail to see the light as to how to bring the correct interface up on the 
guest system (arm-linux). ifconfig shows two devices, lo and dummy0, but 
nothing that would point to a smc91 being detected or used. This is 
independent from whether I try -net tap or -net user.

1) Is the network/smc91x support finished enough to be useable?
2) If so, what is the magic bullet? Any boot options that I need to give 
to the kernel? (BTW, I am calling the emulation as

qemu-system-arm -kernel integratorcp.zImage -initrd arm_root.imfg 
-nographic -net user )

Thanks much for any help,
 Wolfgang
--
Wolfgang Schildbach, Senior Research Engineer
Coding Technologies GmbH

Re: [Qemu-devel] Problems bringing up network in qemu-system-arm

[Daniel Jacobowitz]

On Wed, Jan 04, 2006 at 04:56:13PM +0100, Wolfgang Schildbach wrote:
> Hi everyone,
> 
> I am using the current CVS (HEAD) version of qemu running on x86 linux, 
> and am using it to emulate an ARM on the integrator board, running 
> arm-linux, using arm-test-0.1.tar.gz.
> 
> >From what I've read in this list (
> http://lists.gnu.org/archive/html/qemu-devel/2005-12/msg00137.html), it 
> should be possible to set up a network, user-mode or TUN/TAP. However, I 
> fail to see the light as to how to bring the correct interface up on the 
> guest system (arm-linux). ifconfig shows two devices, lo and dummy0, but 
> nothing that would point to a smc91 being detected or used. This is 
> independent from whether I try -net tap or -net user.
> 
> 1) Is the network/smc91x support finished enough to be useable?

Yes.

> 2) If so, what is the magic bullet? Any boot options that I need to give 
> to the kernel? (BTW, I am calling the emulation as
> 
> qemu-system-arm -kernel integratorcp.zImage -initrd arm_root.imfg 
> -nographic -net user )

-net nic -net user, or no -net option at all.  You need a network card
on the VLAN, and also a connection ("user") to the outside.

-- 
Daniel Jacobowitz
CodeSourcery

Re: [Qemu-devel] Problems bringing up network in qemu-system-arm

[Paul Brook]

> http://lists.gnu.org/archive/html/qemu-devel/2005-12/msg00137.html), it
> should be possible to set up a network, user-mode or TUN/TAP. However, I
> fail to see the light as to how to bring the correct interface up on the
> guest system (arm-linux). ifconfig shows two devices, lo and dummy0, but
> nothing that would point to a smc91 being detected or used. This is
> independent from whether I try -net tap or -net user.

Probably your kernel doesn't have the right driver. Looks like the image on 
the qemu website doesn't include the NIC driver.

Paul

Re: [Qemu-devel] Problems bringing up network in qemu-system-arm

[Wolfgang Schildbach]

Indeed at bootup time the kernel does not appear to detect the smc91 
network card. I'll try to build my own kernel then.

For the kernel at the qemu website, did you use the patch-2.6.14-arm1 
patch available at the ARM website? Which config options did you use -- 
can you post the config file?

Thanks much,

- Wolfgang

Paul Brook <paul@codesourcery.com> wrote on 04.01.2006 22:30:56:

> > http://lists.gnu.org/archive/html/qemu-devel/2005-12/msg00137.html), 
it
> > should be possible to set up a network, user-mode or TUN/TAP. However, 
I
> > fail to see the light as to how to bring the correct interface up on 
the
> > guest system (arm-linux). ifconfig shows two devices, lo and dummy0, 
but
> > nothing that would point to a smc91 being detected or used. This is
> > independent from whether I try -net tap or -net user.
> 
> Probably your kernel doesn't have the right driver. Looks like the image 
on 
> the qemu website doesn't include the NIC driver.
> 
> Paul

--
Wolfgang Schildbach, Senior Research Engineer
Coding Technologies GmbH

Re: [Qemu-devel] Problems bringing up network in qemu-system-arm

[Paul Brook]

[-- Attachment #1: Type: text/plain, Size: 439 bytes --]

On Thursday 05 January 2006 13:59, Wolfgang Schildbach wrote:
> Indeed at bootup time the kernel does not appear to detect the smc91
> network card. I'll try to build my own kernel then.
>
> For the kernel at the qemu website, did you use the patch-2.6.14-arm1
> patch available at the ARM website? 

I used vanilla kernel.org, probably 2.6.14.

> Which config options did you use -- can you post the config file?

Config attached.

Paul


[-- Attachment #2: config.qemu.gz --]
[-- Type: application/x-gzip, Size: 4106 bytes --]

Re: [Qemu-devel] Problems bringing up network in qemu-system-arm

[Wolfgang Schildbach]

Thanks much! I have now successfully built a kernel that runs on qemu, and 
detects the smc91x.

I used the 2.6.14 kernel sources from kernel.org, modified with the patch 
available at the ARM website 
(http://www.arm.com/linux/linux_download.html). After I discovered 
/proc/config.gz (very useful!), I used that to model my config.

- Wolfgang

Paul Brook <paul@codesourcery.com> wrote on 05.01.2006 18:34:49:

> On Thursday 05 January 2006 13:59, Wolfgang Schildbach wrote:
> > Indeed at bootup time the kernel does not appear to detect the smc91
> > network card. I'll try to build my own kernel then.
> >
> > For the kernel at the qemu website, did you use the patch-2.6.14-arm1
> > patch available at the ARM website? 
> 
> I used vanilla kernel.org, probably 2.6.14.
> 
> > Which config options did you use -- can you post the config file?
> 
> Config attached.
> 
> Paul
> 
> [attachment "config.qemu.gz" deleted by Wolfgang 
> Schildbach/nbg/CodingTechnologies] 
--
Wolfgang Schildbach, Senior Research Engineer
Coding Technologies GmbH