targets/nexys4ddr: add default kwargs parameters.

diff --git a/litex/boards/targets/nexys4ddr.py b/litex/boards/targets/nexys4ddr.py
index c65dcf23bd5eb6b97d02c618c63bed2353bd39b3..4a222bb6cda8ebe4e7a445354c7c73ce14933caa 100755 (executable)
--- a/litex/boards/targets/nexys4ddr.py
+++ b/litex/boards/targets/nexys4ddr.py
@@ -75,9 +75,9 @@ class BaseSoC(SoCCore):
                 phy                     = self.ddrphy,
                 module                  = MT47H64M16(sys_clk_freq, "1:2"),
                 origin                  = self.mem_map["main_ram"],
-                size                    = kwargs["max_sdram_size"],
-                l2_cache_size           = kwargs["l2_size"],
-                l2_cache_min_data_width = kwargs["min_l2_data_width"],
+                size                    = kwargs.get("max_sdram_size", 0x40000000),
+                l2_cache_size           = kwargs.get("l2_size", 8192),
+                l2_cache_min_data_width = kwargs.get("min_l2_data_width", 128),
                 l2_cache_reverse        = True
             )