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[2/5] kbuild: Allow DTB overlays to built into .dtbo.S files

Message ID 20240705202954.1149590-3-rasmus.villemoes@prevas.dk
State Changes Requested
Delegated to: Marek Vasut
Headers show
Series finish using .dtso for overlay source files | expand

Commit Message

Rasmus Villemoes July 5, 2024, 8:29 p.m. UTC 
[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@prevas.dk>
---
 scripts/Makefile.lib | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)
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Patch

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