Re: [Buildroot] [PATCH 1/6] configs/stm32f429_disco_xip: fix boot failure after uClibc bump

[Waldemar Brodkorb <wbx@openadk.org>]

Hi Julien,
Julien Olivain via buildroot wrote,

> Hi Dario,
> 
> On 21/07/2026 20:42, Dario Binacchi wrote:
> > Since uClibc was bumped to 1.0.58 (c7fef3704c70, "package/uclibc:
> > bump to 1.0.58"), the board fails to boot:
> > 
> >     sh: out of memory
> >     Kernel panic - not syncing: Attempted to kill init!
> > exitcode=0x00000100
> >     CPU: 0 PID: 1 Comm: init Not tainted 6.1.167 #2
> >     Hardware name: STM32 (Device Tree Support)
> >     Function entered at [<0800ea1e>] from [<0800de7b>]
> >     Function entered at [<0800de7b>] from [<080e4991>]
> >     Function entered at [<080e4991>] from [<080e2d19>]
> >     Function entered at [<080e2d19>] from [<080125eb>]
> >     Function entered at [<080125eb>] from [<08012b09>]
> >     Function entered at [<08012b09>] from [<08012b69>]
> >     ---[ end Kernel panic - not syncing: Attempted to kill init!
> > exitcode=0x00000100 ]---
> > 
> > The STM32F429 has no MMU, and uClibc's standard malloc() implementation
> > returns NULL for allocations performed during early init on this target,
> > causing init to abort immediately.
> > 
> > Fix this by switching to MALLOC_SIMPLE, a plain mmap-based allocator
> > meant for small/noMMU systems, via a uClibc config fragment. The
> > fragment is placed under board/stmicroelectronics/common/stm32f4xx/,
> > rather than under the board-specific directory, so that it can be
> > shared with the STM32F469, another Cortex-M4/noMMU board affected by
> > the same issue, which will be fixed in a subsequent patch.
> 
> For info, the issue may have been introduced by uclibc commit:
> https://github.com/wbx-github/uclibc-ng/commit/487af14988c3c923aa661f204642597cff356a83
> 
> There is an upstream fix, not released yet,  which seems to fix the issue:
> https://github.com/wbx-github/uclibc-ng/commit/7730f0d05a51cd89a7123bd696e4638c3c035d7b
> 
> You could possibly drop this malloc config change after the next uclibc
> bump.
> 
> > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> 
> In the meantime, I applied this series to master, thanks.

I sent following patch to avoid any breakage before the next
release:
https://patchwork.ozlabs.org/project/buildroot/patch/ai6stJaA2hWFBHDW@waldemar-brodkorb.de/

But it was not accepted, yet. Xtensa and M68k noMMU is also
affected.

best regards
 Waldemar

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