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build: image: add append-dtb-elf helper

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The mips kernel vmlinux image supports adding an empty ELF section
for DTB to be later inserted into with MIPS_ELF_APPENDED_DTB.

This ELF + inserted DTB image can then be directly booted on some
devices.

Example usage:
image/subtarget.mk:
KERNEL_NAME := vmlinux.elf
KERNEL_INITRAMFS_NAME := vmlinux-initramfs.elf
KERNEL := kernel-bin | append-dtb-elf

On mt7621 memory size needed to be manually specified.

Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
This commit is contained in:
John Thomson 2020-10-15 19:06:41 +10:00 committed by Chuanhong Guo
parent c063e27e02
commit 9a168b51c3
1 changed files with 7 additions and 0 deletions
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7
include/image-commands.mk
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@ -142,6 +142,13 @@ define Build/append-dtb
cat $(KDIR)/image-$(firstword $(DEVICE_DTS)).dtb >> $@
endef
define Build/append-dtb-elf
$(TARGET_CROSS)objcopy \
--set-section-flags=.appended_dtb=alloc,contents \
--update-section \
.appended_dtb=$(KDIR)/image-$(firstword $(DEVICE_DTS)).dtb $@
endef
define Build/install-dtb
$(call locked, \
$(foreach dts,$(DEVICE_DTS), \