Merge from bittboy/buildroot@db180c0

fs/cramfs/Config.in

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+config BR2_TARGET_ROOTFS_CRAMFS
+	bool "cramfs root filesystem"
+	help
+	  Build a cramfs root filesystem
+
+	  https://github.com/npitre/cramfs-tools
+
+if BR2_TARGET_ROOTFS_CRAMFS
+
+config BR2_TARGET_ROOTFS_CRAMFS_XIP
+	bool "Support XIP of all ELF files"
+	help
+	  For ELF files, uncompressed and properly aligned data blocks
+	  will be automatically be mapped directly into user space
+	  whenever possible providing eXecute-In-Place (XIP) from ROM
+	  of read-only segments. Data segments mapped read-write
+	  (hence they have to be copied to RAM) may still be
+	  compressed in the cramfs image in the same file along with
+	  non compressed read-only segments. Both MMU and no-MMU
+	  systems are supported. This is particularly handy for tiny
+	  embedded systems with very tight memory constraints.
+
+	  The CRAMFS_MTD Kconfig option must also be enabled in a
+	  4.15+ kernel.
+
+endif # BR2_TARGET_ROOTFS_CRAMFS

fs/cramfs/cramfs.mk

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+################################################################################
+#
+# Build the cramfs root filesystem image
+#
+################################################################################
+
+ifeq ($(BR2_ENDIAN),"BIG")
+CRAMFS_OPTS = -B
+else
+CRAMFS_OPTS = -L
+endif
+
+ifeq ($(BR2_TARGET_ROOTFS_CRAMFS_XIP),y)
+ifeq ($(BR2_USE_MMU),y)
+CRAMFS_OPTS += -X -X
+else
+CRAMFS_OPTS += -X
+endif
+endif
+
+define ROOTFS_CRAMFS_CMD
+	$(HOST_DIR)/bin/mkcramfs $(CRAMFS_OPTS) $(TARGET_DIR) $@
+endef
+
+ROOTFS_CRAMFS_DEPENDENCIES = host-cramfs
+
+$(eval $(rootfs))