targets/xilinx_zc706: SFP/etherbone working: added a note to use it

litex_boards/targets/xilinx_zc706.py

@@ -7,6 +7,17 @@
 # SPDX-License-Identifier: BSD-2-Clause
 
 # Build/use
+# Build/Load bitstream:
+# ./xilinx_zc7006.py --with-etherbone --uart-name=crossover --csr-csv=csr.csv --build --load
+#
+# Test Ethernet:
+# ping 192.168.1.50
+#
+# Test Console:
+# litex_server --udp
+# litex_term crossover
+#
+#
 # Build/Load bitstream:
 # ./xilinx_zc706.py --with-jtagbone --uart-name=crossover --csr-csv=csr.csv --build --load
 #
@@ -79,8 +90,11 @@ def __init__(self, sys_clk_freq=125e6,
         with_pcie       = False,
         **kwargs):
         platform = xilinx_zc706.Platform()
+
+        # When nor jtagbone, nor etherbone are set forces jtagbone.
         kwargs["uart_name"]     = "crossover"
-        kwargs["with_jtagbone"] = True
+        if kwargs["with_jtagbone"] or with_etherbone:
+            kwargs["with_jtagbone"] = True
 
         # CRG --------------------------------------------------------------------------------------
         self.crg = _CRG(platform, sys_clk_freq)