diff --git a/litex_boards/targets/lattice_crosslink_nx_evn.py b/litex_boards/targets/lattice_crosslink_nx_evn.py
index 4775f1b..0e91f77 100755
--- a/litex_boards/targets/lattice_crosslink_nx_evn.py
+++ b/litex_boards/targets/lattice_crosslink_nx_evn.py
@@ -21,6 +21,7 @@ from litex.build.generic_platform import *
 
 from litex.soc.cores.clock import *
 from litex.soc.integration.soc_core import *
+from litex.soc.integration.soc import SoCRegion
 from litex.soc.integration.builder import *
 from litex.soc.cores.led import LedChaser
 
@@ -68,6 +69,7 @@ class BaseSoC(SoCCore):
     }
     def __init__(self, sys_clk_freq=75e6, device="LIFCL-40-9BG400C", toolchain="radiant",
         with_led_chaser = True,
+        with_uartbone   = False,
         **kwargs):
         platform = lattice_crosslink_nx_evn.Platform(device=device, toolchain=toolchain)
 
@@ -84,7 +86,7 @@ class BaseSoC(SoCCore):
         # 128KB LRAM (used as SRAM) ---------------------------------------------------------------
         size = 128*kB
         self.spram = NXLRAM(32, size)
-        self.register_mem("sram", self.mem_map["sram"], self.spram.bus, size)
+        self.bus.add_slave("sram", self.spram.bus, SoCRegion(origin=self.mem_map["sram"], size=size))
 
         # Leds -------------------------------------------------------------------------------------
         if with_led_chaser:
@@ -93,8 +95,7 @@ class BaseSoC(SoCCore):
                 sys_clk_freq = sys_clk_freq)
 
         # UARTBone ---------------------------------------------------------------------------------
-        debug_uart = False
-        if debug_uart:
+        if with_uartbone:
             self.add_uartbone()
 
 
@@ -109,12 +110,14 @@ def main():
     parser.add_target_argument("--programmer",    default="radiant",          help="Programmer (radiant or ecpprog).")
     parser.add_target_argument("--address",       default=0x0,                help="Flash address to program bitstream at.")
     parser.add_target_argument("--prog-target",   default="direct",           help="Programming Target (direct or flash).")
+    parser.add_target_argument("--with-uartbone", action="store_true",        help="Add UartBone on 1st serial.")
     args = parser.parse_args()
 
     soc = BaseSoC(
         sys_clk_freq = args.sys_clk_freq,
         device       = args.device,
         toolchain    = args.toolchain,
+        with_uartbone = args.with_uartbone,
         **parser.soc_argdict
     )
     builder = Builder(soc, **parser.builder_argdict)