diff --git a/repack_bootimg.py b/repack_bootimg.py
index cad6058..07e6873 100755
--- a/repack_bootimg.py
+++ b/repack_bootimg.py
@@ -21,7 +21,9 @@
 """
 
 import argparse
+import datetime
 import enum
+import glob
 import os
 import shlex
 import shutil
@@ -75,22 +77,28 @@
     """Enum class for different boot image types."""
     BOOT_IMAGE = 1
     VENDOR_BOOT_IMAGE = 2
+    SINGLE_RAMDISK_FRAGMENT = 3
+    MULTIPLE_RAMDISK_FRAGMENTS = 4
 
 
 class RamdiskImage:
     """A class that supports packing/unpacking a ramdisk."""
-    def __init__(self, ramdisk_img):
+    def __init__(self, ramdisk_img, unpack=True):
         self._ramdisk_img = ramdisk_img
         self._ramdisk_format = None
         self._ramdisk_dir = None
         self._temp_file_manager = TempFileManager()
 
-        self._unpack_ramdisk()
+        if unpack:
+            self._unpack_ramdisk()
+        else:
+            self._ramdisk_dir = self._temp_file_manager.make_temp_dir(
+                suffix='_new_ramdisk')
 
     def _unpack_ramdisk(self):
         """Unpacks the ramdisk."""
         self._ramdisk_dir = self._temp_file_manager.make_temp_dir(
-            suffix=os.path.basename(self._ramdisk_img))
+            suffix='_' + os.path.basename(self._ramdisk_img))
 
         # The compression format might be in 'lz4' or 'gzip' format,
         # trying lz4 first.
@@ -165,10 +173,15 @@
 
         self._unpack_bootimg()
 
+    def _get_vendor_ramdisks(self):
+        """Returns a list of vendor ramdisks after unpack."""
+        return sorted(glob.glob(
+            os.path.join(self._bootimg_dir, 'vendor_ramdisk*')))
+
     def _unpack_bootimg(self):
         """Unpacks the boot.img and the ramdisk inside."""
         self._bootimg_dir = self._temp_file_manager.make_temp_dir(
-            suffix=os.path.basename(self._bootimg))
+            suffix='_' + os.path.basename(self._bootimg))
 
         # Unpacks the boot.img first.
         unpack_bootimg_cmds = [
@@ -195,12 +208,22 @@
         # From the output dir, checks there is 'ramdisk' or 'vendor_ramdisk'.
         ramdisk = os.path.join(self._bootimg_dir, 'ramdisk')
         vendor_ramdisk = os.path.join(self._bootimg_dir, 'vendor_ramdisk')
+        vendor_ramdisks = self._get_vendor_ramdisks()
         if os.path.exists(ramdisk):
             self._ramdisk = RamdiskImage(ramdisk)
             self._bootimg_type = BootImageType.BOOT_IMAGE
         elif os.path.exists(vendor_ramdisk):
             self._ramdisk = RamdiskImage(vendor_ramdisk)
             self._bootimg_type = BootImageType.VENDOR_BOOT_IMAGE
+        elif len(vendor_ramdisks) == 1:
+            self._ramdisk = RamdiskImage(vendor_ramdisks[0])
+            self._bootimg_type = BootImageType.SINGLE_RAMDISK_FRAGMENT
+        elif len(vendor_ramdisks) > 1:
+            # Creates an empty RamdiskImage() below, without unpack.
+            # We'll then add files into this newly created ramdisk, then pack
+            # it with other vendor ramdisks together.
+            self._ramdisk = RamdiskImage(ramdisk_img=None, unpack=False)
+            self._bootimg_type = BootImageType.MULTIPLE_RAMDISK_FRAGMENTS
         else:
             raise RuntimeError('Both ramdisk and vendor_ramdisk do not exist.')
 
@@ -216,13 +239,25 @@
         # Uses previous mkbootimg args, e.g., --vendor_cmdline, --dtb_offset.
         mkbootimg_cmd.extend(self._previous_mkbootimg_args)
 
-        if self._bootimg_type == BootImageType.VENDOR_BOOT_IMAGE:
-            mkbootimg_cmd.extend(['--vendor_ramdisk', new_ramdisk])
-            mkbootimg_cmd.extend(['--vendor_boot', self._bootimg])
-            # TODO(bowgotsai): add support for multiple vendor ramdisk.
-        else:
+        if self._bootimg_type == BootImageType.BOOT_IMAGE:
             mkbootimg_cmd.extend(['--ramdisk', new_ramdisk])
             mkbootimg_cmd.extend(['--output', self._bootimg])
+        elif self._bootimg_type == BootImageType.VENDOR_BOOT_IMAGE:
+            mkbootimg_cmd.extend(['--vendor_ramdisk', new_ramdisk])
+            mkbootimg_cmd.extend(['--vendor_boot', self._bootimg])
+        elif self._bootimg_type == BootImageType.SINGLE_RAMDISK_FRAGMENT:
+            ramdisk_index = (
+                mkbootimg_cmd.index('--vendor_ramdisk_fragment') + 1)
+            mkbootimg_cmd[ramdisk_index] = new_ramdisk
+            mkbootimg_cmd.extend(['--vendor_boot', self._bootimg])
+        elif self._bootimg_type == BootImageType.MULTIPLE_RAMDISK_FRAGMENTS:
+            mkbootimg_cmd.extend(['--ramdisk_type', 'PLATFORM'])
+            ramdisk_name = (
+                'RAMDISK_' +
+                datetime.datetime.now().strftime('%Y-%m-%d_%H:%M:%S'))
+            mkbootimg_cmd.extend(['--ramdisk_name', ramdisk_name])
+            mkbootimg_cmd.extend(['--vendor_ramdisk_fragment', new_ramdisk])
+            mkbootimg_cmd.extend(['--vendor_boot', self._bootimg])
 
         subprocess.check_call(mkbootimg_cmd)
         print("=== Repacked boot image: '{}' ===".format(self._bootimg))