platforms/arty: add spisdcard to _sdcard_pmod_io.

litex_boards/platforms/arty.py

@@ -146,12 +146,21 @@ _io = [
 ]
 
 _sdcard_pmod_io = [ # https://store.digilentinc.com/pmod-microsd-microsd-card-slot/
+    ("spisdcard", 0,
+        Subsignal("clk",  Pins("C15")),
+        Subsignal("mosi", Pins("E16"), Misc("PULLUP True")),
+        Subsignal("cs_n", Pins("E15"), Misc("PULLUP True")),
+        Subsignal("miso", Pins("D15"), Misc("PULLUP True")),
+        Misc("SLEW=FAST"),
+        IOStandard("LVCMOS33"),
+    ),
     ("sdcard", 0,
         Subsignal("data", Pins("D15 J17 J18 E15")),
-        Subsignal("cmd", Pins("E16")),
-        Subsignal("clk", Pins("C15")),
-        Subsignal("cd", Pins("K15")),
-        IOStandard("LVCMOS33"), Misc("SLEW=FAST")
+        Subsignal("cmd",  Pins("E16")),
+        Subsignal("clk",  Pins("C15")),
+        Subsignal("cd",   Pins("K15")),
+        Misc("SLEW=FAST"),
+        IOStandard("LVCMOS33"),
     ),
 ]