diff --git a/tools/debug_stream/debug_stream.py b/tools/debug_stream/debug_stream.py
index 717845dc49e5..ab621378a8cd 100644
--- a/tools/debug_stream/debug_stream.py
+++ b/tools/debug_stream/debug_stream.py
@@ -286,7 +286,7 @@ def catch_up(self, slot):
         self.decode_past_records(slot, circ.w_ptr, circ.next_seqno)
         self.prev_w_ptr = circ.w_ptr
         self.prev_seqno = circ.next_seqno - 1
-        logging.info("seqno %u w_ptr %u", self.prev_seqno, self.prev_w_ptr)
+        logging.debug("seqno %u w_ptr %u", self.prev_seqno, self.prev_w_ptr)
 
     def decode_past_records(self, slot, pos, seqno):
         """
@@ -393,6 +393,12 @@ def update_slot(self):
         self.file.seek(0)
         self.slot = self.file.read(self.file_size)
 
+    def set_slot(self, buf):
+        """
+        Update slot contents
+        """
+        self.slot = buf
+
     def get_descriptors(self):
         """
         Read the core specific descriptors and initialize core
@@ -403,7 +409,7 @@ def get_descriptors(self):
             return False
         hdr = ctypes.cast(self.slot, ctypes.POINTER(DebugStreamSlotHdr))
         if hdr.contents.hdr.magic != DEBUG_STREAM_PAYLOAD_MAGIC:
-            logging.warning("Debug Slot has bad magic 0x%08x", hdr.contents.hdr.magic)
+            logging.info("Debug Slot has bad magic 0x%08x", hdr.contents.hdr.magic)
             return False
         num_sections = hdr.contents.num_sections
         if num_sections == len(self.descs):
@@ -473,6 +479,32 @@ def reset(self):
         self.file = None
         self.slot = None
 
+def cavstool_main_loop(my_args):
+    import cavstool
+    try:
+        (hda, sd, dsp, hda_ostream_id) = cavstool.map_regs(True)
+    except Exception as e:
+        logging.error("Could not map device in sysfs; run as root?")
+        logging.error(e)
+        sys.exit(1)
+
+    decoder = DebugStreamDecoder()
+    while True:
+        if not cavstool.fw_is_alive_dsp(dsp):
+            cavstool.wait_fw_entered_dsp(dsp, timeout_s=None)
+        try:
+            offset = cavstool.debug_slot_offset(my_args.direct_access_slot);
+            buf = cavstool.win_read(offset, 0, 4096)
+            decoder.set_slot(buf)
+            if not decoder.get_descriptors():
+                time.sleep(my_args.update_interval)
+                continue
+            decoder.catch_up_all()
+            if decoder.poll():
+                time.sleep(my_args.update_interval)
+        except:
+            logging.error("win_read() failed")
+            continue
 
 def main_f(my_args):
     """
@@ -483,6 +515,8 @@ def main_f(my_args):
     about the host CPU load. That is why there where no synchronous mechanism
     done and the host simply polls for new records.
     """
+    if my_args.direct_access_slot >= 0:
+	    return cavstool_main_loop(my_args)
     decoder = DebugStreamDecoder()
     prev_error = None
     while True:
@@ -527,6 +561,13 @@ def parse_params():
         help="File to read the DebugStream data from, default /sys/kernel/debug/sof/debug_stream",
         default="/sys/kernel/debug/sof/debug_stream",
     )
+    parser.add_argument(
+        "-c",
+        "--direct-access-slot",
+        help="Access specified debug window slot directly, no need for debugfs file",
+        type=int,
+        default=-1,
+    )
     parsed_args = parser.parse_args()
     return parsed_args