feat(arm): add initrd props to dtb at build time
Add initrd properties to the device tree blob at build time, giving
users the ability to run a linux kernel and successfully boot it to
the terminal. Users can boot a linux kernel in a normal flow as well
as in RESET_TO_BL31. This function is an extension of the build time
option "ARM_LINUX_KERNEL_AS_BL33=1".
The build time options INITRD_SIZE or INITRD_PATH will trigger the
insertion of initrd properties in to the DTB. If both options are
provided then the INITRD_SIZE will take precedence.
The available options are:
INITRD_SIZE: Provide the initrd size in dec or hex (hex format must
precede with '0x'.
Example: INITRD_SIZE=0x1000000
INITRD_PATH: Provide an initrd path for the build time to find its
exact size.
INITRD_BASE: A required build time option that sets the initrd base
address in hex format. A default value can be set by the platform.
Example: INITRD_BASE=0x90000000
Change-Id: Ief8de5f00c453509bcc6e978e0a95d768f1f509c
Signed-off-by: Salman Nabi <salman.nabi@arm.com>
diff --git a/Makefile b/Makefile
index 413ce46..26636c8 100644
--- a/Makefile
+++ b/Makefile
@@ -1638,6 +1638,21 @@
# Expand build macros for the different images
ifeq (${NEED_FDT},yes)
$(eval $(call MAKE_DTBS,$(BUILD_PLAT)/fdts,$(FDT_SOURCES)))
+
+ ifneq (${INITRD_SIZE}${INITRD_PATH},)
+ ifndef INITRD_BASE
+ $(error INITRD_BASE must be set when inserting initrd properties to the DTB.)
+ endif
+
+ INITRD_SIZE ?= $(shell printf "0x%x\n" $$(stat -Lc %s $(INITRD_PATH)))
+ initrd_end = $(shell printf "0x%x\n" $$(expr $$(($(INITRD_BASE) + $(INITRD_SIZE)))))
+
+ define $(HW_CONFIG)-after +=
+ $(s)echo " INITRD $(HW_CONFIG)"
+ $(q)fdtput -t x $@ /chosen linux,initrd-start $(INITRD_BASE)
+ $(q)fdtput -t x $@ /chosen linux,initrd-end $(initrd_end)
+ endef
+ endif
endif #(NEED_FDT)
# Add Secure Partition packages