Support initrd for 'check' target

Makefile

@@ -80,9 +80,9 @@ ext4.img:
 	$(Q)dd if=/dev/zero of=$@ bs=4k count=600
 	$(Q)$(MKFS_EXT4) -F $@
 
-check: $(BIN) minimal.dtb $(KERNEL_DATA) $(DISKIMG_FILE)
+check: $(BIN) minimal.dtb $(KERNEL_DATA) $(INITRD_DATA) $(DISKIMG_FILE)
 	@$(call notice, Ready to launch Linux kernel. Please be patient.)
-	$(Q)./$(BIN) -k $(KERNEL_DATA) -b minimal.dtb -i rootfs.cpio $(OPTS)
+	$(Q)./$(BIN) -k $(KERNEL_DATA) -b minimal.dtb -i $(INITRD_DATA) $(OPTS)
 
 build-image:
 	scripts/build-image.sh
@@ -92,7 +92,7 @@ clean:
 
 distclean: clean
 	$(Q)$(RM) minimal.dtb
-	$(Q)$(RM) Image
+	$(Q)$(RM) Image rootfs.cpio
 	$(Q)$(RM) ext4.img 
 
 -include $(deps)

mk/external.mk

@@ -6,7 +6,12 @@
 # kernel
 KERNEL_DATA_URL = https://github.com/jserv/semu/raw/blob/Image.bz2
 KERNEL_DATA = Image
-KERNEL_DATA_SHA1 = 2583315c6fe4591344fdba4f318a695553b00b20
+KERNEL_DATA_SHA1 = 36d770efe97beac85204f1f50f8de81e3e529d84
+
+# initrd
+INITRD_DATA_URL = https://github.com/jserv/semu/raw/blob/rootfs.cpio.bz2
+INITRD_DATA = rootfs.cpio
+INITRD_DATA_SHA1 = fad749d0a9eb33178525f961d6b82e7c0ce917a7
 
 define download
 $($(T)_DATA):
@@ -16,5 +21,5 @@ $($(T)_DATA):
 	$(Q)bunzip2 $$@.bz2
 endef
 
-EXTERNAL_DATA = KERNEL
+EXTERNAL_DATA = KERNEL INITRD
 $(foreach T,$(EXTERNAL_DATA),$(eval $(download)))