+frank On 1/25/21 3:53 PM, Masahiro Yamada wrote: > On Mon, Jan 25, 2021 at 8:07 PM Uwe Kleine-König <uwe@xxxxxxxxxxxxxxxxx> wrote: >> >> Adding the -@ switch to dtc results in the binary devicetrees containing >> a list of symbolic references and their paths. This is necessary to >> apply device tree overlays e.g. on Raspberry Pi as described on >> https://www.raspberrypi.org/documentation/configuration/device-tree.md. >> >> Obviously the downside of this change is an increas of the size of the >> generated dtbs, for an arm out-of-tree build (multi_v7_defconfig): >> >> $ du -s arch/arm/boot/dts* >> 101380 arch/arm/boot/dts-pre >> 114308 arch/arm/boot/dts-post >> >> so this is in average an increase of 12.8% in size. >> >> Signed-off-by: Uwe Kleine-König <uwe@xxxxxxxxxxxxxxxxx> > > > (CCing DT ML.) > > > https://www.spinics.net/lists/linux-kbuild/msg27904.html > > See Rob's comment: > > "We've already rejected doing that. Turning on '-@' can grow the dtb > size by a significant amount which could be problematic for some > boards." > > > > > > > > >> --- >> scripts/Makefile.lib | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib >> index 213677a5ed33..0683a5808f7f 100644 >> --- a/scripts/Makefile.lib >> +++ b/scripts/Makefile.lib >> @@ -319,7 +319,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE >> >> quiet_cmd_dtc = DTC $@ >> cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ >> - $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \ >> + $(DTC) -@ -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \ >> $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ >> -d $(depfile).dtc.tmp $(dtc-tmp) ; \ >> cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) >> -- >> 2.29.2 >> > > > -- > Best Regards > > Masahiro Yamada >
