[Qemu-devel] Raspberry ARM with 32-bit guest

[Qemu-devel] Raspberry ARM with 32-bit guest

[Benito]

Hi

I know this might absurd, but
I'm trying to run a 32-bit guest on a Raspberry Pi - Raspbian OS - 
Debian Wheezy ARM
I have used :

qemu-img create -f raw harddrive.raw 700M
qemu -hda harddrive.raw -cdrom fedora14.iso

I've installed qemu via apt-get install qemu on the Pi.

After I do the 2nd command, the guest os starts up , but soon consumes 
100% cpu , and then hangs. Tried with puppy 511 , centos6.3 minimal , 
fedora14

Is there a way to run any of these in "invisible" mode or user mode , 
and get past this obstacle.. ?

Can I create this guest on a faster machine , and clone itto the Pi's 
qemu that runs ARM ?

Also am I missing something regarding the creation of the guest? I don't 
need a GUI for the guest, just need to be able to get to it and execute 
commands.
Please could someone point me in the right direction ?

Kind Regards
Benito

Re: [Qemu-devel] Raspberry ARM with 32-bit guest

[Andreas Färber]

Hi,

Am 04.04.2013 13:06, schrieb Benito:
> I know this might absurd, but
> I'm trying to run a 32-bit guest on a Raspberry Pi - Raspbian OS -
> Debian Wheezy ARM
> I have used :
> 
> qemu-img create -f raw harddrive.raw 700M
> qemu -hda harddrive.raw -cdrom fedora14.iso
> 
> I've installed qemu via apt-get install qemu on the Pi.

You're not providing sufficient details for the upstream community to
help you, so CC'ing the Debian maintainer. "qemu" sounds rather old,
it's qemu-system-i386 since several versions already.

Did you check that you have sufficient RAM on your Raspi? Or disk space
on your SD card / USB disk? Disk images are created sparse, and when the
host runs out of resources lots of things can happen.

> After I do the 2nd command, the guest os starts up , but soon consumes
> 100% cpu , and then hangs. Tried with puppy 511 , centos6.3 minimal ,
> fedora14
> 
> Is there a way to run any of these in "invisible" mode or user mode ,
> and get past this obstacle.. ?

qemu-i386 can execute individual Linux binaries, with a bunch of known
issues. Might or might not work for you - you don't say what you
actually want to do.

> Can I create this guest on a faster machine , and clone itto the Pi's
> qemu that runs ARM ?

Yes. The disk image is just a file.

Regards,
Andreas

> Also am I missing something regarding the creation of the guest? I don't
> need a GUI for the guest, just need to be able to get to it and execute
> commands.
> Please could someone point me in the right direction ?
> 
> Kind Regards
> Benito

-- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

Re: [Qemu-devel] Raspberry ARM with 32-bit guest

[Aurelien Jarno]

On Thu, Apr 04, 2013 at 02:05:59PM +0200, Andreas Färber wrote:
> Hi,
> 
> Am 04.04.2013 13:06, schrieb Benito:
> > I know this might absurd, but
> > I'm trying to run a 32-bit guest on a Raspberry Pi - Raspbian OS -
> > Debian Wheezy ARM
> > I have used :
> > 
> > qemu-img create -f raw harddrive.raw 700M
> > qemu -hda harddrive.raw -cdrom fedora14.iso
> > 
> > I've installed qemu via apt-get install qemu on the Pi.
> 
> You're not providing sufficient details for the upstream community to
> help you, so CC'ing the Debian maintainer. "qemu" sounds rather old,
> it's qemu-system-i386 since several versions already.
> 

qemu-system-i386 is likely to be broken on arm hosts, I have never been
able to boot a Linux distribution further than grub. Other architectures
seems to work better though.

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net

Re: [Qemu-devel] Raspberry ARM with 32-bit guest

[Peter Maydell]

On 4 April 2013 14:11, Aurelien Jarno <aurelien@aurel32.net> wrote:
> qemu-system-i386 is likely to be broken on arm hosts, I have never been
> able to boot a Linux distribution further than grub. Other architectures
> seems to work better though.

Try making the guest CPU a 486 -- we've found in the past that
something in early boot divides by zero based on RDTSC values
ending up too close together [cf some comments by David Gilbert
in https://bugs.launchpad.net/qemu-linaro/+bug/893208]

I don't know if this is the result of the host CPU just being
too slow or of our RDTSC emulation not being very good...

-- PMM

Re: [Qemu-devel] Raspberry ARM with 32-bit guest

[Benito]

I've tried , no difference. Same result for puppy, centos and fedora.
CPU seems to be 99% used and nothing happens.

On 04/04/2013 03:17 PM, Peter Maydell wrote:
> On 4 April 2013 14:11, Aurelien Jarno <aurelien@aurel32.net> wrote:
>> qemu-system-i386 is likely to be broken on arm hosts, I have never been
>> able to boot a Linux distribution further than grub. Other architectures
>> seems to work better though.
> Try making the guest CPU a 486 -- we've found in the past that
> something in early boot divides by zero based on RDTSC values
> ending up too close together [cf some comments by David Gilbert
> in https://bugs.launchpad.net/qemu-linaro/+bug/893208]
>
> I don't know if this is the result of the host CPU just being
> too slow or of our RDTSC emulation not being very good...
>
> -- PMM
>
>