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-rw-r--r--linux/Config.in33
-rw-r--r--linux/linux.mk37
2 files changed, 69 insertions, 1 deletions
diff --git a/linux/Config.in b/linux/Config.in
index 84fae910e..553aa3973 100644
--- a/linux/Config.in
+++ b/linux/Config.in
@@ -140,6 +140,13 @@ config BR2_LINUX_KERNEL_UIMAGE
depends on BR2_arm || BR2_armeb || BR2_bfin || BR2_powerpc || BR2_avr32 || BR2_sh || BR2_sh64
select BR2_LINUX_KERNEL_UBOOT_IMAGE
+config BR2_LINUX_KERNEL_APPENDED_UIMAGE
+ bool "uImage with appended DT"
+ depends on BR2_arm || BR2_armeb
+ select BR2_LINUX_KERNEL_DTS_SUPPORT
+ select BR2_LINUX_KERNEL_APPENDED_DTB
+ select BR2_LINUX_KERNEL_UBOOT_IMAGE
+
config BR2_LINUX_KERNEL_BZIMAGE
bool "bzImage"
depends on BR2_i386 || BR2_x86_64
@@ -148,6 +155,12 @@ config BR2_LINUX_KERNEL_ZIMAGE
bool "zImage"
depends on BR2_arm || BR2_armeb || BR2_powerpc || BR2_sparc || BR2_sh || BR2_sh64 || BR2_xtensa
+config BR2_LINUX_KERNEL_APPENDED_ZIMAGE
+ bool "zImage with appended DT"
+ depends on BR2_arm || BR2_armeb
+ select BR2_LINUX_KERNEL_DTS_SUPPORT
+ select BR2_LINUX_KERNEL_APPENDED_DTB
+
config BR2_LINUX_KERNEL_VMLINUX_BIN
bool "vmlinux.bin"
depends on BR2_mips || BR2_mipsel || BR2_sh || BR2_sh64
@@ -187,6 +200,26 @@ config BR2_LINUX_KERNEL_DTS_SUPPORT
if BR2_LINUX_KERNEL_DTS_SUPPORT
+# We have mainly three cases when it comes to device tree support:
+# 1) We don't want any support at all. Then the ..DTS_SUPPORT
+# variable won't be set
+# 2) We want device tree support, so we need the user to enter
+# the device tree name or the the path to the custom device
+# he uses, but the kernel abstracts this from us and only
+# build an image that looks like a regular kernel image. In
+# this case, we only need to derive the kernel image name from
+# the given device tree name, and all the rest is as usual
+# 3) We want device tree support, but the kernel requires us to
+# build the device tree blob separately. In this case, some
+# more logic will be needed.
+# The variable below address the second case, were you only want
+# limited actions from buildroot.
+config BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
+ bool
+
+config BR2_LINUX_KERNEL_APPENDED_DTB
+ bool
+
choice
prompt "Device tree source"
default BR2_LINUX_KERNEL_USE_INTREE_DTS
diff --git a/linux/linux.mk b/linux/linux.mk
index 844ce5529..d466228f2 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -58,6 +58,13 @@ else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
KERNEL_DTS_NAME = $(basename $(notdir $(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))
endif
+ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
+ifneq ($(words $(KERNEL_DTS_NAME)),1)
+$(error Kernel with appended device tree needs exactly one DTS source.\
+ Check BR2_LINUX_KERNEL_INTREE_DTS_NAME or BR2_LINUX_KERNEL_CUSTOM_DTS_PATH.)
+endif
+endif
+
ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
LINUX_IMAGE_NAME=$(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
else
@@ -68,10 +75,14 @@ LINUX_IMAGE_NAME=vmImage
else
LINUX_IMAGE_NAME=uImage
endif
+else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
+LINUX_IMAGE_NAME=uImage
else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
LINUX_IMAGE_NAME=bzImage
else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
LINUX_IMAGE_NAME=zImage
+else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
+LINUX_IMAGE_NAME=zImage
else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
LINUX_IMAGE_NAME=vmlinux.bin
else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
@@ -81,6 +92,12 @@ LINUX_IMAGE_NAME=vmlinuz
endif
endif
+ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
+LINUX_IMAGE_TARGET=zImage
+else
+LINUX_IMAGE_TARGET=$(LINUX_IMAGE_NAME)
+endif
+
# Compute the arch path, since i386 and x86_64 are in arch/x86 and not
# in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
# for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
@@ -161,10 +178,13 @@ define LINUX_CONFIGURE_CMDS
$(call KCONFIG_SET_OPT,CONFIG_UEVENT_HELPER_PATH,\"/sbin/mdev\",$(@D)/.config))
$(if $(BR2_PACKAGE_SYSTEMD),
$(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config))
+ $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
+ $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
yes '' | $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) oldconfig
endef
ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
+ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
define LINUX_BUILD_DTB
$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTS_NAME).dtb
endef
@@ -172,17 +192,32 @@ define LINUX_INSTALL_DTB
cp $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb $(BINARIES_DIR)/
endef
endif
+endif
+
+ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
+define LINUX_APPEND_DTB
+ cat $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb >> $(KERNEL_ARCH_PATH)/boot/zImage
+ # We need to generate the uImage here after that so that the uImage is
+ # generated with the right image size.
+ $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) uImage
+endef
+else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
+define LINUX_APPEND_DTB
+ cat $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb >> $(KERNEL_ARCH_PATH)/boot/zImage
+endef
+endif
# Compilation. We make sure the kernel gets rebuilt when the
# configuration has changed.
define LINUX_BUILD_CMDS
$(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
cp $(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH) $(KERNEL_ARCH_PATH)/boot/dts/)
- $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
+ $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_TARGET)
@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ; \
fi
$(LINUX_BUILD_DTB)
+ $(LINUX_APPEND_DTB)
endef