From a6f80694cb33725285617bb492132ddfaab5d4b6 Mon Sep 17 00:00:00 2001
From: rob-ng15 <58272847+rob-ng15@users.noreply.github.com>
Date: Wed, 18 Mar 2020 12:11:57 +0000
Subject: [PATCH 1/2] Add in support for secondary sd card via spi hardware
 bitbanging

---
 litex_boards/platforms/de10nano.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/litex_boards/platforms/de10nano.py b/litex_boards/platforms/de10nano.py
index dd29f60..b041e95 100644
--- a/litex_boards/platforms/de10nano.py
+++ b/litex_boards/platforms/de10nano.py
@@ -101,6 +101,15 @@ _mister_sdram_module_io = [
         Subsignal("we_n", Pins("AA19")),
         IOStandard("3.3-V LVTTL")
     ),
+
+    # SPI SD CARD HARDWARE BITBANGING
+    ("spi",0,
+        Subsignal("clk", Pins("AH26")),                                      
+        Subsignal("mosi", Pins("AF27")),                                    
+        Subsignal("cs_n", Pins("AF28")),                                    
+        Subsignal("miso", Pins("AF25")),                                    
+        IOStandard("3.3-V LVTTL")
+    ),
 ]
 
 # Platform -----------------------------------------------------------------------------------------

From bc6ef0bc48df065069fdefe9112145d7ae6b9a16 Mon Sep 17 00:00:00 2001
From: rob-ng15 <58272847+rob-ng15@users.noreply.github.com>
Date: Wed, 18 Mar 2020 12:13:37 +0000
Subject: [PATCH 2/2] Allow access to secondary sd card via hardware spi
 bitbanging

---
 litex_boards/targets/de10nano.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/litex_boards/targets/de10nano.py b/litex_boards/targets/de10nano.py
index aceaadd..a7a1961 100755
--- a/litex_boards/targets/de10nano.py
+++ b/litex_boards/targets/de10nano.py
@@ -17,6 +17,9 @@ from litex.soc.integration.builder import *
 from litedram.modules import AS4C16M16
 from litedram.phy import GENSDRPHY
 
+#SPI SD CARD HARDWARE BITBANGING
+from litex.soc.cores.spi import SPIMaster
+
 # CRG ----------------------------------------------------------------------------------------------
 
 class _CRG(Module):
@@ -103,6 +106,12 @@ class MiSTerSDRAMSoC(SoCSDRAM):
                 geom_settings   = sdram_module.geom_settings,
                 timing_settings = sdram_module.timing_settings)
 
+        # SPI SDCARD HARDWARE BITBANGING
+        spi_pads = self.platform.request("spi")
+        self.add_csr("spi")
+        spi_clk_freq = 400e3
+        self.submodules.spi = SPIMaster(spi_pads, 8, sys_clk_freq, spi_clk_freq)
+
 # Build --------------------------------------------------------------------------------------------
 
 def main():