[Buildroot] grub compilation issue (x86_64 target)

Thu Jul 22 16:22:45 UTC 2010

i386/ISO/grub/ext2 combination is working for me. I was able to fully boot
buildroot on qemu for the first time. Used initrd as main fs which will
allow to run diagnostics without disk. :-)

Thanks
Vincent

On Wed, Jul 21, 2010 at 6:19 PM, vbr vbr <vvvg77 at gmail.com> wrote:

> 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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