From 24105f12d5bddbee8f31fc9b51aeeb297aff21ba Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Thu, 6 May 2021 15:25:18 +0200
Subject: [PATCH] openocd/stream: Expose chain parameter.

---
 litex/build/openocd.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/litex/build/openocd.py b/litex/build/openocd.py
index f287f6365..052b622fb 100644
--- a/litex/build/openocd.py
+++ b/litex/build/openocd.py
@@ -40,7 +40,7 @@ class OpenOCD(GenericProgrammer):
         self.call(["openocd", "-f", config, "-c", script])
 
 
-    def stream(self, port=20000):
+    def stream(self, port=20000, chain=1):
         """
         Create a TCP server to stream data to/from the internal JTAG TAP of the FPGA
 
@@ -139,7 +139,7 @@ proc jtagstream_serve {tap port} {
         write_to_file("stream.cfg", cfg)
         script = "; ".join([
             "init",
-            "irscan $_CHIPNAME.tap $_USER1",
+            "irscan $_CHIPNAME.tap {:d}".format(0x1 + chain),
             "jtagstream_serve $_CHIPNAME.tap {:d}".format(port),
             "exit",
         ])