[gentoo-amd64] Mixing Architectures... AMD64 bit kernel on 32bit build.

[gentoo-amd64] Mixing Architectures... AMD64 bit kernel on 32bit build.

[Joel Wiramu Pauling]

Hi all,

quick question about mixing archs.

Can I safely put a 64bit compiled kernel image into /boot/ along
with /lib/modules<version> and the source in /usr/src/<version>

into a fully 32bit image? 

If so what other utilities on the system NEED to be 64bit for this to
work? 

I have a 32bit precooked image I use, and have dumped it onto a Turion
laptop (see http://aenertia.net/megabook_m635.html for coverage). 

I am getting alot of issues with IRQ and USB f$%#ups. And am wondering
if a native 64bit kernel will help. But want to know if I can simply
drop an am64 kernel into the middle of a 32bit environment and have it
boot? 

What is the easiest route for me to do this based on the above linked
report.

Kind regards



Joel W


P.S any help with this laptop would be appreciated.


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Re: [gentoo-amd64] Mixing Architectures... AMD64 bit kernel on 32bit build.

[Jeremy Huddleston]

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> Can I safely put a 64bit compiled kernel image into /boot/ along
> with /lib/modules<version> and the source in /usr/src/<version>
> into a fully 32bit image? 

Yes, as long as you don't have a 32bit kernel also in /lib/modules/* of
the same version.

> If so what other utilities on the system NEED to be 64bit for this to
> work? 

Assuming you have 32bit support in the kernel, nothing...

> I have a 32bit precooked image I use, and have dumped it onto a Turion
> laptop (see http://aenertia.net/megabook_m635.html for coverage). 
> 
> I am getting alot of issues with IRQ and USB f$%#ups. And am wondering
> if a native 64bit kernel will help. But want to know if I can simply
> drop an am64 kernel into the middle of a 32bit environment and have it
> boot? 

Yep, you can.  This is what sparc64 does.

> What is the easiest route for me to do this based on the above linked
> report.

You'll need to get an x86_64 compiler on your system (crossdev should
work fine, or you can modify gcc64), then you'll need to cross-compile
the kernel (there are plenty of docs online about how to do this).

--Jeremy

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Re: [gentoo-amd64] Mixing Architectures... AMD64 bit kernel on 32bit build.

[Joel Wiramu Pauling]

> 
> Yep, you can.  This is what sparc64 does.

Brilliant!
> 
> > What is the easiest route for me to do this based on the above linked
> > report.
> 
> You'll need to get an x86_64 compiler on your system (crossdev should
> work fine, or you can modify gcc64), then you'll need to cross-compile
> the kernel (there are plenty of docs online about how to do this).
> 
> --Jeremy

Thanks... Thats Ok I have plenty of native opterons I can build on I was
just more concerned if I needed extras like binutils etc (and hence have
to much around changing /usr/libs paths). This is great!

Onto it now... Hopefully I can build up a nice kernel for that laptop
and when the client comes back just drop it in and everything (fingers
crossed) will go.

Kind regards

Joel W

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Re: [gentoo-amd64] Mixing Architectures... AMD64 bit kernel on 32bit build.

[Joel Wiramu Pauling]

On Sat, 2005-10-29 at 01:34 -0700, Jeremy Huddleston wrote:
Crap... this is probably not going to work as easily as hopped...
ndiswrapper is needed and I also have out of kernel alsa... I spose I
can compile alsa modules on a native box and it should be ok... does
anyone know if ndiswrapper needs any particular librarys to work or does
it just reside as a module and some wrapper scripts?

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