[PATCH 04/10] microblaze: Update linker scripts to ensure appended device tree is aligned

[Ilias Apalodimas]

On Fri, 16 Jan 2026 at 00:28, Tom Rini <trini at konsulko.com> wrote:
>
> With commit 0535e46d55d7 ("scripts/dtc: Update to upstream version
> v1.7.2-35-g52f07dcca47c") it is now a fatal error to U-Boot if our
> device tree is not 8-byte aligned. In commit f613a6e15ef7 ("ARM: OMAP2+:
> Pad SPL binary to 8-byte alignment before DTB") Beleswar Padhi explains
> that we must have ALIGN(x) statements inside of a section to ensure that
> padding is included and not simply that the linker address counter is
> incremented. To that end, this patch:
> - Aligns the final section before _end (for U-Boot) or _image_binary_end
>   (for xPL phases) by 8-bytes by adjusting the ALIGN(4) statement to be
>   ALIGN(8) in the final section before the symbol.
> - Ensure that we do have alignment by adding an ASSERT so that when not
>   aligned we fail to link (and explain why).
>
> Signed-off-by: Tom Rini <trini at konsulko.com>
> ---

Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>

> Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> Cc: Marek Vasut <marek.vasut+renesas at mailbox.org>
> Cc: Michal Simek <michal.simek at amd.com>
> Cc: Richard Henderson <richard.henderson at linaro.org>
> ---
>  arch/microblaze/cpu/u-boot-spl.lds | 5 ++++-
>  arch/microblaze/cpu/u-boot.lds     | 4 +++-
>  2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/arch/microblaze/cpu/u-boot-spl.lds b/arch/microblaze/cpu/u-boot-spl.lds
> index 09abbea84d06..620ef2c96dbd 100644
> --- a/arch/microblaze/cpu/u-boot-spl.lds
> +++ b/arch/microblaze/cpu/u-boot-spl.lds
> @@ -50,7 +50,7 @@ SECTIONS
>                 *(.bss)
>                 *(.bss.*)
>                 *(COMMON)
> -               . = ALIGN(4);
> +               . = ALIGN(8);
>                 __bss_end = .;
>         }
>         _end = . ;
> @@ -61,3 +61,6 @@ SECTIONS
>  ASSERT(_end - _start <= (CONFIG_SPL_MAX_FOOTPRINT), \
>          "SPL image plus BSS too big");
>  #endif
> +
> +ASSERT(_image_binary_end % 8 == 0, \
> +       "_image_binary_end must be 8-byte aligned for device tree");
> diff --git a/arch/microblaze/cpu/u-boot.lds b/arch/microblaze/cpu/u-boot.lds
> index a2c8fb2e21c0..70fa49c31712 100644
> --- a/arch/microblaze/cpu/u-boot.lds
> +++ b/arch/microblaze/cpu/u-boot.lds
> @@ -67,8 +67,10 @@ SECTIONS
>                 *(.scommon)
>                 *(.bss*)
>                 *(COMMON)
> -               . = ALIGN(4);
> +               . = ALIGN(8);
>                 __bss_end = .;
>         }
>         _end = . ;
>  }
> +
> +ASSERT(_end % 8 == 0, "_end must be 8-byte aligned for device tree");
> --
> 2.43.0
>