On 08/16/17 14:59, Tom Rini wrote: > Build the dtb file for these platfroms with __symbol__ information > included. This will reduce the size of the dtb (and resident memory
typo: reduce the size should be increase the size > usage) in exchange for allowing more types of overlays to be applied to > the dtb file prior to passing it to Linux and additional functionality > within the kernel when OF_OVERLAY is enabled. > > Cc: Jason Kridner <[email protected]> > Cc: Drew Fustini <[email protected]> > Cc: Robert Nelson <[email protected]> > Cc: Lokesh Vutla <[email protected]> > Cc: Frank Rowand <[email protected]> > Cc: Rob Herring <[email protected]> > Cc: Mark Rutland <[email protected]> > Cc: Russell King <[email protected]> > Cc: [email protected] > Cc: [email protected] > Cc: [email protected] > Signed-off-by: Tom Rini <[email protected]> > --- > This patch takes the path that Rob encouraged in my previous patch of > enabling __symbols__ in some platforms now (that can use it) and see if > a critical mass evolves that pushes towards -@ being default for all > dtbs. I would suggest that the dra76 series be respun to include a hunk > like this at least as well, and if there's another Beagle X15 patch, > that too. Russell, per some of our conversations, something like would > also be needed as part of using overlays to solve some of the problems > with Hummingboard, etc. > --- > arch/arm/boot/dts/Makefile | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile > index 4b17f35dc9a7..6f98422ca00e 100644 > --- a/arch/arm/boot/dts/Makefile > +++ b/arch/arm/boot/dts/Makefile > @@ -1063,3 +1063,17 @@ dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst > $(dtstree)/%.dts,%.dtb, $(wildcard $(dts > > always := $(dtb-y) > clean-files := *.dtb > + > +# enable creation of __symbols__ node > +DTC_FLAGS_am335x-bone += -@ > +DTC_FLAGS_am335x-boneblack += -@ > +DTC_FLAGS_am335x-boneblack-wireless += -@ > +DTC_FLAGS_am335x-boneblue += -@ > +DTC_FLAGS_am335x-bonegreen += -@ > +DTC_FLAGS_am335x-bonegreen-wireless += -@ > +DTC_FLAGS_am57xx-beagle-x15 += -@ > +DTC_FLAGS_am57xx-beagle-x15-revb1 += -@ > +DTC_FLAGS_dra7-evm += -@ > +DTC_FLAGS_dra72-evm += -@ > +DTC_FLAGS_dra72-evm-revc += -@ > +DTC_FLAGS_dra71-evm += -@ > I would prefer that instead of "-@", a configurable value be used. The current form of the patch imposes the extra overhead even for those who do not want to use any overlay. Using a kernel CONFIG_ value for the "configurable value" is not desired because it adds a kernel configuration dependency to what is contained in a dtb. I do not know if we can find another better way to make this configurable. AMaybe Rob's suggestion of a shell variable used in the make command.
