[PATCH v2 2/5] kbuild: Allow DTB overlays to built into .dtbo.S files
Simon Glass
sjg at chromium.org
Fri Sep 20 18:01:25 CEST 2024
On Wed, 10 Jul 2024 at 09:17, Rasmus Villemoes
<rasmus.villemoes at prevas.dk> wrote:
>
> [linux commit 941214a512d8, modified for U-Boot by removing the
> include of vmlinux.lds.h and replacing STRUCT_ALIGNMENT by 16.]
>
> DTB files can be built into the kernel by converting them to assembly
> files then assembling them into object files. We extend this here
> for DTB overlays with the .dtso extensions.
>
> We change the start and end delimiting tag prefix to make it clear that
> this data came from overlay files.
>
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
> ---
> scripts/Makefile.lib | 20 +++++++++++++++++++-
> 1 file changed, 19 insertions(+), 1 deletion(-)
>
Reviewed-by: Simon Glass <sjg at chromium.org>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 3e68d5aa803..549c3619472 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -305,7 +305,7 @@ endif
> DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
>
> # Generate an assembly file to wrap the output of the device tree compiler
> -quiet_cmd_dt_S_dtb= DTB $@
> +quiet_cmd_dt_S_dtb= DTBS $@
> # Modified for U-Boot
> cmd_dt_S_dtb= \
> ( \
> @@ -322,6 +322,24 @@ cmd_dt_S_dtb= \
> $(obj)/%.dtb.S: $(obj)/%.dtb
> $(call cmd,dt_S_dtb)
>
> +# Generate an assembly file to wrap the output of the device tree compiler
> +quiet_cmd_dt_S_dtbo= DTBOS $@
> +# Modified for U-Boot
> +cmd_dt_S_dtbo= \
> +{ \
> + echo '.section .dtb.init.rodata,"a"'; \
> + echo '.balign 16'; \
> + echo '.global __dtbo_$(subst -,_,$(*F))_begin'; \
> + echo '__dtbo_$(subst -,_,$(*F))_begin:'; \
> + echo '.incbin "$<" '; \
> + echo '__dtbo_$(subst -,_,$(*F))_end:'; \
> + echo '.global __dtbo_$(subst -,_,$(*F))_end'; \
> + echo '.balign 16'; \
> +} > $@
> +
> +$(obj)/%.dtbo.S: $(obj)/%.dtbo
> + $(call cmd,dt_S_dtbo)
> +
> ifeq ($(CONFIG_OF_LIBFDT_OVERLAY),y)
> DTC_FLAGS += -@
> endif
> --
> 2.45.2
>
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