build/openocd: Fix tap name for zynq_7000

zynq_7000 have a special tap name fpr PL defined in openocd
config file.

Just hardcode it here.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

litex/build/openocd.py

@@ -40,6 +40,12 @@ class OpenOCD(GenericProgrammer):
         ])
         self.call(["openocd", "-f", config, "-c", script])
 
+    def get_tap_name(self, config):
+        cfg_str = open(config).read()
+        if "zynq_7000" in cfg_str:
+            return "zynq_pl.bs"
+        return "$_CHIPNAME.tap"
+
     def get_ir(self, chain, config):
         cfg_str = open(config).read()
         # Lattice ECP5.
@@ -98,6 +104,7 @@ class OpenOCD(GenericProgrammer):
           - TX valid : bit 9
         """
         config   = self.find_config()
+        tap_name = self.get_tap_name(config)
         ir       = self.get_ir(chain, config)
         endstate = self.get_endstate(config)
         cfg = """
@@ -186,8 +193,8 @@ proc jtagstream_serve {tap port} {
         script = "; ".join([
             "init",
             "poll off",
-            "irscan $_CHIPNAME.tap {:d}".format(ir),
+            "irscan {} {:d}".format(tap_name, ir),
-            "jtagstream_serve $_CHIPNAME.tap {:d}".format(port),
+            "jtagstream_serve {} {:d}".format(tap_name, port),
             "exit",
         ])
         self.call(["openocd", "-f", config, "-f", "stream.cfg", "-c", script])