diff --git a/litex_boards/platforms/ecpix5.py b/litex_boards/platforms/ecpix5.py
index 56fd519..cf89bac 100644
--- a/litex_boards/platforms/ecpix5.py
+++ b/litex_boards/platforms/ecpix5.py
@@ -111,8 +111,9 @@ class Platform(LatticePlatform):
     default_clk_name   = "clk100"
     default_clk_period = 1e9/100e6
 
-    def __init__(self, toolchain="trellis", **kwargs):
-        LatticePlatform.__init__(self, "LFE5UM5G-85F-8BG554I", _io, _connectors, toolchain=toolchain, **kwargs)
+    def __init__(self, device="85F", toolchain="trellis", **kwargs):
+        assert device in ["45F", "85F"]
+        LatticePlatform.__init__(self, f"LFE5UM5G-{device}-8BG554I", _io, _connectors, toolchain=toolchain, **kwargs)
 
     def create_programmer(self):
         return OpenOCDJTAGProgrammer("openocd_ecpix5.cfg")
diff --git a/litex_boards/targets/ecpix5.py b/litex_boards/targets/ecpix5.py
index 6a2a7e7..5305053 100755
--- a/litex_boards/targets/ecpix5.py
+++ b/litex_boards/targets/ecpix5.py
@@ -77,8 +77,8 @@ class _CRG(Module):
 # BaseSoC ------------------------------------------------------------------------------------------
 
 class BaseSoC(SoCCore):
-    def __init__(self, sys_clk_freq=int(75e6), with_ethernet=False, **kwargs):
-        platform = ecpix5.Platform(toolchain="trellis")
+    def __init__(self, device="85F", sys_clk_freq=int(75e6), with_ethernet=False, **kwargs):
+        platform = ecpix5.Platform(device=device, toolchain="trellis")
 
         # SoCCore ----------------------------------------------------------------------------------
         SoCCore.__init__(self, platform, sys_clk_freq,
@@ -128,6 +128,7 @@ def main():
     parser = argparse.ArgumentParser(description="LiteX SoC on ECPIX-5")
     parser.add_argument("--build",         action="store_true", help="Build bitstream")
     parser.add_argument("--load",          action="store_true", help="Load bitstream")
+    parser.add_argument("--device",        default="85F",       help="ECP5 device (default: 85F)")
     parser.add_argument("--sys-clk-freq",  default=75e6,        help="System clock frequency (default: 75MHz)")
     parser.add_argument("--with-sdcard",   action="store_true", help="Enable SDCard support")
     parser.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support")
@@ -137,6 +138,7 @@ def main():
     args = parser.parse_args()
 
     soc = BaseSoC(
+        device = args.device,
         sys_clk_freq  = int(float(args.sys_clk_freq)),
         with_ethernet = args.with_ethernet,
         **soc_core_argdict(args)