[2/6] kbuild: Allow DTB overlays to built into .dtso.S files
Commit Message
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.
[Based on patch by Frank Rowand <frank.rowand@sony.com>]
Signed-off-by: Andrew Davis <afd@ti.com>
---
scripts/Makefile.lib | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
Comments
On Sun, Oct 23, 2022 at 8:24 PM Andrew Davis <afd@ti.com> wrote:
> 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.
>
> [Based on patch by Frank Rowand <frank.rowand@sony.com>]
> Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
@@ -358,7 +358,7 @@ DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
# 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 $@
cmd_dt_S_dtb= \
{ \
echo '\#include <asm-generic/vmlinux.lds.h>'; \
@@ -375,6 +375,24 @@ cmd_dt_S_dtb= \
$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
$(call if_changed,dt_S_dtb)
+# Generate an assembly file to wrap the output of the device tree compiler
+quiet_cmd_dt_S_dtbo= DTBOS $@
+cmd_dt_S_dtbo= \
+{ \
+ echo '\#include <asm-generic/vmlinux.lds.h>'; \
+ echo '.section .dtb.init.rodata,"a"'; \
+ echo '.balign STRUCT_ALIGNMENT'; \
+ echo '.global __dtbo_$(subst -,_,$(*F))_begin'; \
+ echo '__dtbo_$(subst -,_,$(*F))_begin:'; \
+ echo '.incbin "$<" '; \
+ echo '__dtbo_$(subst -,_,$(*F))_end:'; \
+ echo '.global __dtbo_$(subst -,_,$(*F))_end'; \
+ echo '.balign STRUCT_ALIGNMENT'; \
+} > $@
+
+$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
+ $(call if_changed,dt_S_dtbo)
+
quiet_cmd_dtc = DTC $@
cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
$(DTC) -o $@ -b 0 \