Merge from bittboy/buildroot@db180c0

fs/cpio/cpio.mk

@@ -0,0 +1,52 @@
+################################################################################
+#
+# cpio to archive target filesystem
+#
+################################################################################
+
+ifeq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
+
+define ROOTFS_CPIO_ADD_INIT
+	if [ ! -e $(TARGET_DIR)/init ]; then \
+		ln -sf sbin/init $(TARGET_DIR)/init; \
+	fi
+endef
+
+else
+# devtmpfs does not get automounted when initramfs is used.
+# Add a pre-init script to mount it before running init
+# We must have /dev/console very early, even before /init runs,
+# for stdin/stdout/stderr
+define ROOTFS_CPIO_ADD_INIT
+	if [ ! -e $(TARGET_DIR)/init ]; then \
+		$(INSTALL) -m 0755 fs/cpio/init $(TARGET_DIR)/init; \
+	fi
+	mkdir -p $(TARGET_DIR)/dev
+	mknod -m 0622 $(TARGET_DIR)/dev/console c 5 1
+endef
+
+endif # BR2_ROOTFS_DEVICE_CREATION_STATIC
+
+ROOTFS_CPIO_PRE_GEN_HOOKS += ROOTFS_CPIO_ADD_INIT
+
+# --reproducible option was introduced in cpio v2.12, which may not be
+# available in some old distributions, so we build host-cpio
+ifeq ($(BR2_REPRODUCIBLE),y)
+ROOTFS_CPIO_DEPENDENCIES += host-cpio
+ROOTFS_CPIO_OPTS += --reproducible
+endif
+
+define ROOTFS_CPIO_CMD
+	cd $(TARGET_DIR) && find . | cpio $(ROOTFS_CPIO_OPTS) --quiet -o -H newc > $@
+endef
+
+ifeq ($(BR2_TARGET_ROOTFS_CPIO_UIMAGE),y)
+ROOTFS_CPIO_DEPENDENCIES += host-uboot-tools
+define ROOTFS_CPIO_UBOOT_MKIMAGE
+	$(MKIMAGE) -A $(MKIMAGE_ARCH) -T ramdisk \
+		-C none -d $@$(ROOTFS_CPIO_COMPRESS_EXT) $@.uboot
+endef
+ROOTFS_CPIO_POST_GEN_HOOKS += ROOTFS_CPIO_UBOOT_MKIMAGE
+endif
+
+$(eval $(rootfs))