Re: [Buildroot] [PATCH v1 1/1] package/gcc: add microblaze atomic support

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Neal,

On Mon, 28 Jul 2025 05:51:45 +0100
Neal Frager via buildroot <buildroot@buildroot.org> wrote:

> This patch adds atomic test and set support for the microblaze arch.  A patch
> is required to use atomic test and set with gcc 14 and 15 which has been
> submitted upstream.
> 
> To test this patch with gcc 14:
> $ cat > .config<<EOF
> BR2_microblazeel=y
> BR2_GCC_VERSION_14_X=y
> BR2_TOOLCHAIN_BUILDROOT_CXX=y
> BR2_PACKAGE_ACPITOOL=y
> EOF
> $ make olddefconfig
> $ make
> 
> To test this patch with gcc 15:
> $ cat > .config<<EOF
> BR2_microblazeel=y
> BR2_GCC_VERSION_15_X=y
> BR2_TOOLCHAIN_BUILDROOT_CXX=y
> BR2_PACKAGE_ACPITOOL=y
> EOF
> $ make olddefconfig
> $ make
> 
> Fixes: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118280
> Upstream: https://patchwork.ozlabs.org/project/gcc/list/?series=466193
> 
> Signed-off-by: Neal Frager <neal.frager@amd.com>

Thanks a lot for this patch, which I have successfully tested, so:

Tested-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

However, there is now a separate problem: a build with gcc 14.x
generates a working user-space, but a build with gcc 15.x does not.

Try to build qemu_microblazeel_mmu_defconfig and then run it under qemu:

  ./output/host/bin/qemu-system-microblazeel -M petalogix-s3adsp1800 -kernel output/images/linux.bin -serial stdio

it works fine.

Now, change to GCC 15.x, rebuild from scratch, try again: the kernel
will boot, but the boot will stop at:

Run /init as init process
  with arguments:
    /init
  with environment:
    HOME=/
    TERM=linux

and never go further.

Any idea?

Thomas Petazzoni
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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