[Qemu-devel] Compile QEMU for android

[Qemu-devel] Compile QEMU for android

[Spartacus Rex]

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Hi there,

I am trying to get a version of qemu to compile for Android.

Then I would like to boot debian-armel.. or even a minimal arm buildroot fs.

I have so far tried compiling with NDK toolchain and codesourcery.

You can build them, but either they seg-fault when you run them on Android
or the scsi stuff seems wrong when you boot.. crashes.. sorry don't know
more about that.

I am obviously doing something wrong..

Is there anybody who can help - tell me how - point me in the right
direction - to compiling a stable version of qemu-system-arm for Android ?

Thanks in advance!

Spartacus

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Re: [Qemu-devel] Compile QEMU for android

[David Ahern]

On 01/18/2012 08:41 AM, Spartacus Rex wrote:
> Hi there,
> 
> I am trying to get a version of qemu to compile for Android.
> 
> Then I would like to boot debian-armel.. or even a minimal arm buildroot fs.

Why do you want to run a VM on Android versus using the rootfs natively?

David

Re: [Qemu-devel] Compile QEMU for android

[Spartacus Rex]

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Yes, it's important that root is not required..

I just want a Normal version of qemu.

I am trying to get it to work in terminal IDE :-)

A slow full gcc-arm tool chain would be nice..

Spartacus
On Jan 18, 2012 8:37 PM, "David Ahern" <dsahern@gmail.com> wrote:

> On 01/18/2012 08:41 AM, Spartacus Rex wrote:
> > Hi there,
> >
> > I am trying to get a version of qemu to compile for Android.
> >
> > Then I would like to boot debian-armel.. or even a minimal arm buildroot
> fs.
>
> Why do you want to run a VM on Android versus using the rootfs natively?
>
> David
>

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Re: [Qemu-devel] Compile QEMU for android

[Peter Maydell]

On 18 January 2012 15:41, Spartacus Rex <spartacusrex99@gmail.com> wrote:
> I am trying to get a version of qemu to compile for Android.
>
> Then I would like to boot debian-armel.. or even a minimal arm buildroot fs.
>
> I have so far tried compiling with NDK toolchain and codesourcery.
>
> You can build them, but either they seg-fault when you run them on Android
> or the scsi stuff seems wrong when you boot.. crashes.. sorry don't know
> more about that.

This is excessively vague. Quoting error messages is usually a better
idea than handwaving about crashes.

There's an Android bug where (at least for some gcc versions) the
__builtin___clear_cache() function doesn't work. You might like to
try the test in this Android bug report:
http://code.google.com/p/android/issues/detail?id=1803
to see if it still affects your compiler. (It's possible it's one of
those bugs that was valid 3 years ago and has since been fixed but
nobody closed the bug report.)

> I am obviously doing something wrong..
>
> Is there anybody who can help - tell me how - point me in the right
> direction - to compiling a stable version of qemu-system-arm for Android ?

The other thing to note is that QEMU 1.0 was noted in the release notes
as not working on ARM hosts. Some but not all of this has been fixed
since then.

Bottom line: you can probably get this going if you're prepared
to investigate and fix some issues. If you're hoping that somebody
will have a simple recipe you can follow, I suspect you're out of
luck :-(

-- PMM

Re: [Qemu-devel] Compile QEMU for android

[Spartacus Rex]

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OK.

Is there a version that is known to work..? On arm.

Spartacus
On Jan 18, 2012 10:33 PM, "Peter Maydell" <peter.maydell@linaro.org> wrote:

> On 18 January 2012 15:41, Spartacus Rex <spartacusrex99@gmail.com> wrote:
> > I am trying to get a version of qemu to compile for Android.
> >
> > Then I would like to boot debian-armel.. or even a minimal arm buildroot
> fs.
> >
> > I have so far tried compiling with NDK toolchain and codesourcery.
> >
> > You can build them, but either they seg-fault when you run them on
> Android
> > or the scsi stuff seems wrong when you boot.. crashes.. sorry don't know
> > more about that.
>
> This is excessively vague. Quoting error messages is usually a better
> idea than handwaving about crashes.
>
> There's an Android bug where (at least for some gcc versions) the
> __builtin___clear_cache() function doesn't work. You might like to
> try the test in this Android bug report:
> http://code.google.com/p/android/issues/detail?id=1803
> to see if it still affects your compiler. (It's possible it's one of
> those bugs that was valid 3 years ago and has since been fixed but
> nobody closed the bug report.)
>
> > I am obviously doing something wrong..
> >
> > Is there anybody who can help - tell me how - point me in the right
> > direction - to compiling a stable version of qemu-system-arm for Android
> ?
>
> The other thing to note is that QEMU 1.0 was noted in the release notes
> as not working on ARM hosts. Some but not all of this has been fixed
> since then.
>
> Bottom line: you can probably get this going if you're prepared
> to investigate and fix some issues. If you're hoping that somebody
> will have a simple recipe you can follow, I suspect you're out of
> luck :-(
>
> -- PMM
>

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Re: [Qemu-devel] Compile QEMU for android

[Peter Maydell]

On 18 January 2012 21:36, Spartacus Rex <spartacusrex99@gmail.com> wrote:
> Is there a version that is known to work..? On arm.

Current git master plus this patch:
http://git.linaro.org/gitweb?p=qemu/qemu-linaro.git;a=commitdiff;h=5462c1db44e6bfb4cd9e8de45aad208910af3a88

should work on a Linux ARM host.

-- PMM

Re: [Qemu-devel] Compile QEMU for android

[Alex Bradbury]

On 18 January 2012 21:33, Peter Maydell <peter.maydell@linaro.org> wrote:
> There's an Android bug where (at least for some gcc versions) the
> __builtin___clear_cache() function doesn't work. You might like to
> try the test in this Android bug report:
> http://code.google.com/p/android/issues/detail?id=1803
> to see if it still affects your compiler. (It's possible it's one of
> those bugs that was valid 3 years ago and has since been fixed but
> nobody closed the bug report.)

Apparently it's definitely fixed in the most recent NDK (check by
objdump -d on a binary that uses __clear_cache), but it's a real shame
the bug hasn't been updated with any indication as to what NDK version
it was fixed in.

Alex

Re: [Qemu-devel] Compile QEMU for android

[Spartacus Rex]

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When you try and compile the latest version with ndk tool it says it can't
find

arm-linux-androideabi-pkg-config

?

How can I get that ?

Can that be disabled in the latest version, so as to not use pkg-config?

Sorry, more of a java man..

Spartacus
On Jan 19, 2012 12:27 AM, "Alex Bradbury" <asb@asbradbury.org> wrote:

> On 18 January 2012 21:33, Peter Maydell <peter.maydell@linaro.org> wrote:
> > There's an Android bug where (at least for some gcc versions) the
> > __builtin___clear_cache() function doesn't work. You might like to
> > try the test in this Android bug report:
> > http://code.google.com/p/android/issues/detail?id=1803
> > to see if it still affects your compiler. (It's possible it's one of
> > those bugs that was valid 3 years ago and has since been fixed but
> > nobody closed the bug report.)
>
> Apparently it's definitely fixed in the most recent NDK (check by
> objdump -d on a binary that uses __clear_cache), but it's a real shame
> the bug hasn't been updated with any indication as to what NDK version
> it was fixed in.
>
> Alex
>

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