################################################################################ # # Build a kernel with an integrated initial ramdisk filesystem based on cpio. # ################################################################################ # The generic fs infrastructure isn't very useful here. # # The initramfs image does not actually build an image; its only purpose is: # 1- to ensure rootfs.cpio is generated, # 2- to then rebuild the kernel with rootfs.cpio as initramfs # # Note: ordering of the dependencies is not guaranteed here, but in # linux/linux.mk, via the linux-rebuild-with-initramfs rule, which depends # on the rootfs-cpio filesystem rule. # # Note: the trick here is that we directly depend on rebuilding the Linux # kernel image (which itself depends on the rootfs-cpio rule), while we # advertise that our dependency is on the rootfs-cpio rule, which is # cleaner in the dependency graph. rootfs-initramfs: linux-rebuild-with-initramfs rootfs-initramfs-show-depends: @echo rootfs-cpio .PHONY: rootfs-initramfs rootfs-initramfs-show-depends ifeq ($(BR2_TARGET_ROOTFS_INITRAMFS),y) TARGETS_ROOTFS += rootfs-initramfs endif # Not using the rootfs infra, so fake the variables ROOTFS_INITRAMFS_NAME = rootfs-initramfs ROOTFS_INITRAMFS_TYPE = rootfs ROOTFS_INITRAMFS_DEPENDENCIES = rootfs-cpio linux