diff --git a/tools/releasetools/sparse_img.py b/tools/releasetools/sparse_img.py
index 524c0f2..e824a64 100644
--- a/tools/releasetools/sparse_img.py
+++ b/tools/releasetools/sparse_img.py
@@ -41,8 +41,7 @@
   """
 
   def __init__(self, simg_fn, file_map_fn=None, clobbered_blocks=None,
-               mode="rb", build_map=True, allow_shared_blocks=False,
-               hashtree_info_generator=None):
+               mode="rb", build_map=True, allow_shared_blocks=False):
     self.simg_f = f = open(simg_fn, mode)
 
     header_bin = f.read(28)
@@ -74,8 +73,6 @@
         blk_sz, total_chunks)
 
     if not build_map:
-      assert not hashtree_info_generator, \
-        "Cannot generate the hashtree info without building the offset map."
       return
 
     pos = 0   # in blocks
@@ -114,16 +111,6 @@
         if data_sz != 0:
           raise ValueError("Don't care chunk input size is non-zero (%u)" %
                            (data_sz))
-        # Fills the don't care data ranges with zeros.
-        # TODO(xunchang) pass the care_map to hashtree info generator.
-        if hashtree_info_generator:
-          fill_data = '\x00' * 4
-          # In order to compute verity hashtree on device, we need to write
-          # zeros explicitly to the don't care ranges. Because these ranges may
-          # contain non-zero data from the previous build.
-          care_data.append(pos)
-          care_data.append(pos + chunk_sz)
-          offset_map.append((pos, chunk_sz, None, fill_data))
 
         pos += chunk_sz
 
@@ -150,10 +137,6 @@
     extended = extended.intersect(all_blocks).subtract(self.care_map)
     self.extended = extended
 
-    self.hashtree_info = None
-    if hashtree_info_generator:
-      self.hashtree_info = hashtree_info_generator.Generate(self)
-
     if file_map_fn:
       self.LoadFileBlockMap(file_map_fn, self.clobbered_blocks,
                             allow_shared_blocks)
@@ -286,8 +269,6 @@
         remaining = remaining.subtract(ranges)
 
     remaining = remaining.subtract(clobbered_blocks)
-    if self.hashtree_info:
-      remaining = remaining.subtract(self.hashtree_info.hashtree_range)
 
     # For all the remaining blocks in the care_map (ie, those that
     # aren't part of the data for any file nor part of the clobbered_blocks),
@@ -350,8 +331,6 @@
         out["__NONZERO-%d" % i] = rangelib.RangeSet(data=blocks)
     if clobbered_blocks:
       out["__COPY"] = clobbered_blocks
-    if self.hashtree_info:
-      out["__HASHTREE"] = self.hashtree_info.hashtree_range
 
   def ResetFileMap(self):
     """Throw away the file map and treat the entire image as