[Buildroot] grub compilation issue (x86_64 target)

[vbr vbr]

That's what I had just decided earlier today. :-)

While trying to boot the ISO, I am getting a "image too big" error. My
rootfs.iso9660 is about 315 MB. This seems huge, I was expecting something
about 20MB. As I am a buildroot beginner, I only changed a few config
parameters. Do these sizes sound reasonable??

[vincent at 192.168.0.1 buildroot-2010.05]$ ls -al output/images/
total 622044
drwxr-xr-x 2 root    root       4096 Jul 15 10:23 .
drwxr-xr-x 9 vincent users      4096 Jul 14 14:49 ..
-rw-r--r-- 1 root    root    2528704 Jul 15 15:41 bzImage
-rw-r--r-- 1 root    root  315383808 Jul 15 16:07 rootfs.ext2
-rw-r--r-- 1 root    root  318392320 Jul 15 16:07 rootfs.iso9660

Thanks
Vincent



On Wed, Jul 21, 2010 at 5:33 PM, Paul Jones <paul at pauljones.id.au> wrote:

> Could you just use the 32bit x86 rather than the x86_64? I do this myself
> for testing and it works fine.
>
>
>
>
>
> Paul.
>
>
>
>
>
> *From:* buildroot-bounces at busybox.net [mailto:
> buildroot-bounces at busybox.net] *On Behalf Of *vbr vbr
> *Sent:* Thursday, 22 July 2010 5:09 AM
> *To:* Thomas Petazzoni
> *Cc:* buildroot at busybox.net
> *Subject:* Re: [Buildroot] grub compilation issue (x86_64 target)
>
>
>
> Thanks for the quick answer.
>
> Just playing to see the feasability of using buildroot as a diagnostic OS
> on x86_64 servers. It is not meant to be the real OS running on these
> servers.
>
> One thing I am confused about is that ISO support was added recently for
> x86_64 targets in buildroot and it seems that ISO requires grub (from
> menuconfig). If grub is not supported, then ISO can't be supported either
> for x86_64. Also, I am pretty sure that grub was building fine on buildroot
> 2010.05 for x86_64. I could check that again.
>
> Thanks
> Vincent
>
> On Wed, Jul 21, 2010 at 11:59 AM, Thomas Petazzoni <
> thomas.petazzoni at free-electrons.com> wrote:
>
> Hello,
>
>
> On Wed, 21 Jul 2010 08:11:24 -0700
> vbr vbr <vvvg77 at gmail.com> wrote:
>
> > There seems to be a compilation issue in the grub area with
> > buildroot's latest code (git) with x86_64 target. (or maybe it's just
> > my setup) After googling a little bit, the type of error shown in the
> > config.log seems to indicate a missing library.
> > I attached the config log and my buildroot config.
>
> Yes, this is due to the fact that Grub uses the x86_64
> cross-compilation toolchain with the -m32 gcc switch, in order to
> produce 32 bits binaries. Unfortunately, the toolchain that Buildroot
> produces is a pure 64 bits toolchain, so it cannot support the -m32
> switch.
>
> I see four possible solutions to this :
>
>  *) Extend the Buildroot toolchain build system so that it can produce
>    a 32/64 bits multilib toolchain that supports -m32. As embedded on
>    x86_64 is very uncommon, I'm not sure we'll find someone who is
>    interested to work on this.
>
>  *) Extend Crosstool-NG so that it can produce such a 32/64 bits
>    toolchain and then use it as an external toolchain. I've started to
>    work on multilib support for Crosstool-NG, but it's far from being
>    ready at the moment.
>
>  *) Somehow make Buildroot generate two toolchains, a 32 bits one used
>    to compile Grub, and a 64 bits toolchain to compile all the rest.
>    Since would involve fairly large and complicated modifications,
>    which I'm not sure we're ready to do for such a untypical use-case.
>
>  *) Mark Grub as broken on x86_64 so that it cannot be compiled. I
>    think this is the solution we're going to choose. Grub can always
>    be compiled outside of Buildroot, and the build of bootloaders is
>    not the biggest added value of embedded build systems such as
>    Buildroot anyway.
>
> Just out of curiosity, what is your use case for using Buildroot on a
> x86_64 machine ? Is it just for experimenting/playing, or are they real
> embedded products out there using x86_64 and that have footprint
> requirements that make using Buildroot an interesting thing compared to
> using full-blown distributions ?
>
> Thanks,
>
> Thomas
> --
> Thomas Petazzoni, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com
>
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