platforms/arty: add missing pullups on sdcard.

litex_boards/platforms/arty.py

@@ -147,7 +147,7 @@ _io = [
 
 _i2s_pmod_io = [
     # I2S PMOD on JD:
-    # - https://store.digilentinc.com/pmod-i2s2-stereo-audio-input-and-output/ 
+    # - https://store.digilentinc.com/pmod-i2s2-stereo-audio-input-and-output/
     ("i2s_rx_mclk", 0, Pins("E2"), IOStandard("LVCMOS33")),
     ("i2s_rx", 0,
         Subsignal("clk", Pins("H2")),
@@ -177,8 +177,8 @@ _sdcard_pmod_io = [
         IOStandard("LVCMOS33"),
     ),
     ("sdcard", 0,
-        Subsignal("data", Pins("F4 E2 D2 D4")),
-        Subsignal("cmd", Pins("D3")),
+        Subsignal("data", Pins("F4 E2 D2 D4"), Misc("PULLUP True")),
+        Subsignal("cmd", Pins("D3"), Misc("PULLUP True")),
         Subsignal("clk", Pins("F3")),
         Subsignal("cd", Pins("H2")),
         Misc("SLEW=FAST"),