Re: [gentoo-user] chroot: cannot run command `bin/bash': Exec format error

["Boyd Stephen Smith Jr." <bss03@volumehost.com>]

On Thursday 23 February 2006 15:56, Bo Andresen <bo.andresen@gmail.com> 
wrote about 'Re: [gentoo-user] chroot: cannot run command `bin/bash': Exec 
format error':
> > > Will a 64 bit kernel be able to run a 32 bit bash?
> >
> > A 64-bit kernel will run 32-bit binaries fine... Um, there may be a
> > needed kernel option though... CONFIG_IA32_EMUL? Anyone?
>
> I cannot seem to find any such kernel config option.

I think these are relevant:
$ zgrep -i ia32 /proc/config.gz
CONFIG_IA32_EMULATION=y
CONFIG_IA32_AOUT=y

> > > In order to get a 64
> > > bit kernel a have to set CFLAGS=-march=k8
> >
> > Your CFLAGS in make.conf don't affect your kernel, normally.
>
> Didn't really think so either. It's just that I still get  the Exec
> format error when I try to chroot. Is there a way to very that I really
> am running a 64 kernel?

I believe this tells you:
$ uname -m
x86_64

> > > and set the processor type to
> > > K8 in the kernel configuration, right?
> >
> > Just setting the proper processor type should build your kernel as
> > 64-bit.
>
> Did do that.

The only thing I can't think of at this point is something from the gentoo 
cross compile howto from vapier that may or may not apply:

"If you want to cross compile a kernel, do this:
 make ARCH=hppa CROSS_COMPILE=hppa2.0-unknown-linux-gnu-"

So, you may want to configure, make, and install your kernel like:
make ARCH=x86_64 menuconfig
make ARCH=x86_64
make ARCH=x86_64 install

(You don't need a CROSS_COMPILE prefix since gcc should work fine.)

-- 
Boyd Stephen Smith Jr.
bss03@volumehost.com
ICQ: 514984 YM/AIM: DaTwinkDaddy
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