software/liblitesdcard: create fat directory for FatFs files.

litex/soc/software/bios/boot.c

@@ -30,7 +30,7 @@
 
 #include <liblitesdcard/spisdcard.h>
 #include <liblitesdcard/sdcard.h>
-#include <liblitesdcard/ff.h>
+#include <liblitesdcard/fat/ff.h>
 
 extern void boot_helper(unsigned long r1, unsigned long r2, unsigned long r3, unsigned long addr);
 

litex/soc/software/liblitesdcard/Makefile

@@ -14,6 +14,9 @@ liblitesdcard.a: $(OBJECTS)
 %.o: $(LIBLITESDCARD_DIRECTORY)/%.c
 	$(compile)
 
+%.o: $(LIBLITESDCARD_DIRECTORY)/fat/%.c
+	$(compile)
+
 %.o: %.S
 	$(assemble)
 

litex/soc/software/liblitesdcard/spisdcard.c

@@ -12,8 +12,8 @@
 #include <generated/mem.h>
 #include <system.h>
 
-#include "ff.h"
-#include "diskio.h"
+#include "fat/ff.h"
+#include "fat/diskio.h"
 #include "spisdcard.h"
 
 #ifdef CSR_SPISDCARD_BASE