[Buildroot] [Bug 6092] New: Bootable ISO image creation seems to have stopped working since 2012.08

[Buildroot] [Bug 6092] New: Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

           Summary: Bootable ISO image creation seems to have stopped
                    working since 2012.08
           Product: buildroot
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: gfx229-uclibc at yahoo.com
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


2012.08 and prior generated bootable ISO images whereas the changes after this
(which defaulted to CPIO initramfs from Ext2 filesystem image) seems to have
stopped working (could be operator error but no obvious documentation in this
scenario).

Repro (2012.11 to 2013.02) - used mostly straight-line defaults:
 [ ] Linux kernel - Install kernel image to /boot in target, used 
                    i386_defconfig extracted from Linux kernel build as
                    defined kernel config
 [ ] Bootloaders - specified both grub and syslinux (Install isolinux)
 [ ] Filesystem images - iso image, fs/iso9660/menu.lst
                       - cpio the root filesystem (no compression method)
 [ ] Package selection - nothing but BusyBox

Observed behavior - burned ISO boots and hangs after "Loading Stage2 ....."

Previous good (2012.08) 
 [ ] Burned ISO bootable (I think because initrd is Ext2 rather than
Initramfs/CPIO)

---

Perhaps I'm doing something wrong or need other configuration parameters for
the Linux kernel (I tried adding other filesystem module support but that did
not help nor do I suspect it is necessary).  If there is some BuildRoot
documentation that I'm overlooking or need to do more directly with Linux
kernel configuration to ensure even a "linked-in" initramfs copy works, I'm
happy to further investigate my own issues.  (It just was working fine with the
Ext2 initrd but seems to have stopped after the changes in 2012.11 so I was
wondering where I've gone wrong or if this is not a widely tested scenario.)

Thank you very much and best regards.

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #1 from gfx229-uclibc at yahoo.com 2013-03-13 18:43:35 UTC ---
FWIW - the kernel and initramfs (cpio) images work independently of the ISO
image created (just the current formatting as a bootable ISO seems disrupted).

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #2 from gfx229-uclibc at yahoo.com 2013-03-13 19:02:54 UTC ---
Additional information - I hand-built an ISO using the stage2_eltorito bits
built from my 2012.08 build and the resulting ISO is bootable. So I imagine
there's something amiss with the grub-0.97 bits between now and then that are
contributing to my hang.  Will continue to investigate as time permits.

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #3 from gfx229-uclibc at yahoo.com 2013-03-13 19:04:50 UTC ---
FYI, to clarify, I combined bits built from my current 2013.02 build and
el-torito bits from my 2012.08 builds.  Thus the focus is on the Grub bits used
to create a bootable ISO. Thanks.

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #4 from gfx229-uclibc at yahoo.com 2013-03-13 21:55:21 UTC ---
FYI - I now believe this is a GCC versionitis issue per se.  Kicking my build
back to GCC 4.5.x (instead of 4.6.x as is the current default) restores the
bootability of the resulting bits.  I'm not sure how these newer compilers are
impacting the build of the Grub directory but I will ad this note as an
advisory at this point.  If you wish to close this as not a bug you wish to
track (but rather document for work-around status), please feel free.  Thanks
for your continued valued work.

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #5 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2013-03-15 14:56:49 UTC ---
Thanks a lot for the great investigation! Can you try the patch at
http://free-electrons.com/~thomas/pub/0001-grub-bump-to-0.97-67.patch ?

I think it should fix the gcc 4.6 problem. The patch simply bumps the Grub
version we use to a slightly more recent Debian patch version, which precisely
includes a gcc 4.6 related fix.

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #6 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2013-05-26 13:34:07 UTC ---
Did you had the time to test the proposed patch?

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #7 from gfx229-uclibc at yahoo.com 2013-05-31 16:24:58 UTC ---
Sorry, this one got past me as we were using the work around here. I will try
it asap.  (Is it already in the RC betas?)  Thank you and apologies for the
delay.

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #8 from Sven Neumann <s.neumann@raumfeld.com> 2013-08-26 09:57:51 UTC ---
(In reply to comment #6)
> Did you had the time to test the proposed patch?

We have run into this problem today when trying to create a bootable ISO image
of our firmware for use on our continuous integration server. We are using the
2013.05 release with gcc 4.7.

I've applied the patch that bumps grub to 0.97-67 but the boot still hangs at
"Loading Stage2 ....."

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

--- Comment #9 from tentothe8th at yahoo.com 2013-10-07 18:28:26 UTC ---
Based on a Gentoo patch, I found that adding the flag "-fno-reorder-functions"
to GRUB_CFLAGS in boot/grub/grub.mk makes the ISO bootable again.  The Gentoo
patch only adds it to STAGE2_CFLAGS, but changing grub.mk is easier than making
a new patch since it doesn't interfere with the other patches being applied.

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[Buildroot] [Bug 6092] Bootable ISO image creation seems to have stopped working since 2012.08

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6092

Thomas Petazzoni <thomas.petazzoni@free-electrons.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #10 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2014-01-08 05:01:59 UTC ---
I've tested ISO support with Grub recently on the master Buildroot branch, and
it just worked. I did a few improvements to make things slightly better, but
I'm not experiencing the problems described in this bug report.

Therefore, I believe the bug has been fixed. If not, feel free to reopen, after
testing the latest Buildroot version. Thanks!

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