From 6c81fc708c8c8f7dd62e343977b1b3a19a848eef Mon Sep 17 00:00:00 2001
From: Ilia Sergachev <ilia@sergachev.ch>
Date: Sun, 23 Jan 2022 13:05:51 +0100
Subject: [PATCH] tang nano 4k: add memory regions, set default cpu

---
 litex_boards/targets/sipeed_tang_nano_4k.py | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/litex_boards/targets/sipeed_tang_nano_4k.py b/litex_boards/targets/sipeed_tang_nano_4k.py
index 5fde977..9a1c697 100755
--- a/litex_boards/targets/sipeed_tang_nano_4k.py
+++ b/litex_boards/targets/sipeed_tang_nano_4k.py
@@ -93,6 +93,15 @@ class BaseSoC(SoCCore):
 
         if self.cpu_type == "gowin_emcu":
             self.cpu.connect_uart(platform.request("serial"))
+            self.bus.add_region("sram", SoCRegion(
+                origin=self.cpu.mem_map["sram"],
+                size=16 * 1024)
+            )
+            self.bus.add_region("rom", SoCRegion(
+                origin=self.cpu.mem_map["rom"],
+                size=32 * 1024,
+                linker=True)
+            )
         else:
             # Add ROM linker region --------------------------------------------------------------------
             self.bus.add_region("rom", SoCRegion(
@@ -140,12 +149,9 @@ def main():
     parser.add_argument("--sys-clk-freq",default=27e6,        help="System clock frequency.")
     builder_args(parser)
     soc_core_args(parser)
+    parser.set_defaults(cpu_type="gowin_emcu")
     args = parser.parse_args()
 
-    if args.cpu_type == 'gowin_emcu':
-        # FIXME: ARM software not supported yet
-        args.no_compile_software = True
-
     soc = BaseSoC(
         sys_clk_freq=int(float(args.sys_clk_freq)),
         **soc_core_argdict(args)
@@ -163,5 +169,6 @@ def main():
         prog.flash(0, os.path.join(builder.gateware_dir, "impl", "pnr", "project.fs"))
         prog.flash(0, "build/sipeed_tang_nano_4k/software/bios/bios.bin", external=True)
 
+
 if __name__ == "__main__":
     main()