Allow access to secondary sd card via hardware spi bitbanging

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():