The idea in 3609e1dc5f4d (dts: automatically build necessary .dtb files) was fine, but the implementation was suboptimal due to some misunderstandings on my part (and possibly defects in some defconfig files):
- Sometimes DEFAULT_DEVICE_TREE is not included in OF_LIST or SPL_OF_LIST
- SPL_OF_LIST is not always a subset of OF_LIST
- While SPL_OF_LIST governs the list of dtbs relevant to SPL (i.e., may be built into an SPL-with-bunch-of-dtbs-to-choose-between-at-runtime), those dtbs are not actually _built_ during the SPL build phase, i.e. when $(SPL_) would expand to SPL_. fdtgrep runs on the artifacts produced during the ordinary U-Boot build.
Tweak the logic so that we simply add the union of all dtbs mentioned in either DEFAULT_DEVICE_TREE, OF_LIST and SPL_OF_LIST to dtb-y. That should, for real, ensure that we always build all the dtbs that is relevant to the current board, and should in turn enable us to massively simplify arch/*/dts/Makefile.
Signed-off-by: Rasmus Villemoes rasmus.villemoes@prevas.dk --- Per https://lore.kernel.org/u-boot/20230503145438.GB1134230@bill-the-cat/
I guess one could apply make's built-in sort function since the RHS is very likely to contain some duplicates, but I don't think it really matters. So for now I'm just posting the version of the patch that Tom tested.
scripts/Makefile.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/Makefile.dts b/scripts/Makefile.dts index 2561025da8..5e2429c617 100644 --- a/scripts/Makefile.dts +++ b/scripts/Makefile.dts @@ -1,3 +1,3 @@ # SPDX-License-Identifier: GPL-2.0+
-dtb-y += $(patsubst %,%.dtb,$(subst ",,$(CONFIG_$(SPL_)OF_LIST))) +dtb-y += $(patsubst %,%.dtb,$(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE) $(CONFIG_OF_LIST) $(CONFIG_SPL_OF_LIST)))