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kernel: Add support to append DTBs to kernel image

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* Many Qualcomm targets that uses boot header v0 or v1
  have the DTBs appended to the end of kernel image.

* In downstream msm kernels up to msm-4.19, Appending DTBs
  is handled in the kernel tree. However, on msm-5.4 and
  newer msm kernels, and on mainline kernel, This is not
  supported.

* Normally, DTB processing depends on how the bootloader
  loads it and should not be handled in the kernel tree,
  so we handle it here.

* Instead of appending all DTBs by default, Get the list of
  DTBs that needs to be included from a variable, so that
  we don't need to modify dts Makefile to exclude unwanted
  DTBs, and we could also ensure the DTBs are appended in
  a specific order.

Change-Id: I603d1ebac5ee808bad045b85f9868d572d52cb80
This commit is contained in:
Yumi Yukimura
2024-01-09 15:53:23 +08:00
committed by Jan Altensen
parent a699cdecbf
commit f171568f8b
1 changed files with 26 additions and 0 deletions
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26
build/tasks/kernel.mk
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@@ -41,6 +41,9 @@
# For example, for ARM devices,
# use zImage-dtb instead of zImage.
#
# BOARD_KERNEL_APPEND_DTBS = List of DTBs to be appended to the kernel image,
# wildcard is allowed for filename.
#
# BOARD_DTB_CFG = Path to a mkdtboimg config file for dtb.img
#
# BOARD_DTBO_CFG = Path to a mkdtboimg config file
@@ -688,14 +691,37 @@ endif
## Install it
ifeq ($(or $(FULL_RECOVERY_KERNEL_BUILD), $(FULL_KERNEL_BUILD)),true)
# Append DTBs to kernel image
# $(1): output directory path (The value passed to O=)
# $(2): output kernel image path
define append-dtbs-to-kernel-image
$(hide) if grep -q '^CONFIG_OF=y' $(1)/.config; then \
$(if $(BOARD_KERNEL_APPEND_DTBS),\
echo "Appending DTBs to kernel image";\
$(foreach dtb,$(BOARD_KERNEL_APPEND_DTBS),\
cat `find $(1)/arch/$(KERNEL_ARCH)/boot/dts/$(dir $(dtb)) -maxdepth 1 -type f -name "$(notdir $(dtb))"` >> $(2);\
)\
)\
true;\
fi
endef
endif # FULL_RECOVERY_KERNEL_BUILD or FULL_KERNEL_BUILD
ifeq ($(NEEDS_KERNEL_COPY),true)
$(INSTALLED_KERNEL_TARGET): $(KERNEL_BIN)
$(transform-prebuilt-to-target)
$(if $(filter true,$(FULL_KERNEL_BUILD)),\
$(call append-dtbs-to-kernel-image,$(KERNEL_OUT),$@))
endif
ifeq ($(RECOVERY_KERNEL_COPY),true)
$(INSTALLED_RECOVERY_KERNEL_TARGET): $(RECOVERY_BIN)
$(transform-prebuilt-to-target)
$(if $(filter true,$(FULL_RECOVERY_KERNEL_BUILD)),\
$(call append-dtbs-to-kernel-image,$(RECOVERY_KERNEL_OUT),$@))
endif
.PHONY: recovery-kernel