diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 5e5d572..9ad2535 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -1629,9 +1629,11 @@
 U_BOOT_CMD(
 	bootz,	CONFIG_SYS_MAXARGS,	1,	do_bootz,
 	"boot Linux zImage image from memory",
-	"[addr [initrd] [fdt]]\n    - boot Linux zImage stored in memory\n"
+	"[addr [initrd[:size]] [fdt]]\n"
+	"    - boot Linux zImage stored in memory\n"
 	"\tThe argument 'initrd' is optional and specifies the address\n"
-	"\tof the initrd in memory.\n"
+	"\tof the initrd in memory. The optional argument ':size' allows\n"
+	"\tspecifying the size of RAW initrd.\n"
 #if defined(CONFIG_OF_LIBFDT)
 	"\tWhen booting a Linux kernel which requires a flat device-tree\n"
 	"\ta third argument is required which is the address of the\n"
diff --git a/common/image.c b/common/image.c
index 8c644b7..103e0e6 100644
--- a/common/image.c
+++ b/common/image.c
@@ -797,6 +797,7 @@
 	ulong rd_addr, rd_load;
 	ulong rd_data, rd_len;
 	const image_header_t *rd_hdr;
+	char *end;
 #if defined(CONFIG_FIT)
 	void		*fit_hdr;
 	const char	*fit_uname_config = NULL;
@@ -994,9 +995,17 @@
 			break;
 #endif
 		default:
-			puts("Wrong Ramdisk Image Format\n");
-			rd_data = rd_len = rd_load = 0;
-			return 1;
+#ifdef CONFIG_SUPPORT_RAW_INITRD
+			if (argc >= 3 && (end = strchr(argv[2], ':'))) {
+				rd_len = simple_strtoul(++end, NULL, 16);
+				rd_data = rd_addr;
+			} else
+#endif
+			{
+				puts("Wrong Ramdisk Image Format\n");
+				rd_data = rd_len = rd_load = 0;
+				return 1;
+			}
 		}
 	} else if (images->legacy_hdr_valid &&
 			image_check_type(&images->legacy_hdr_os_copy,