Update SD version and start working on DMA

hw/super6502_fpga/src/sim/Makefile

@@ -9,6 +9,7 @@ INCLUDE=include/sdram_controller_define.vh
 TB_NAME=sim_top
 
 COPY_FILES=addr_map.mem init_hex.mem
+SD_IMAGE=sd_image.bin
 
 FLAGS=-DSIM -DRTL_SIM -DVERILATOR -DSDIO_AXI
 
@@ -17,9 +18,12 @@ all: waves
 waves: $(TB_NAME)
 	./$(TB_NAME) -fst
 
-$(TB_NAME): $(SUPER6502_FPGA_SOURCES) $(SIM_SOURCES) $(COPY_FILES)
+$(TB_NAME): $(SUPER6502_FPGA_SOURCES) $(SIM_SOURCES) $(COPY_FILES) $(SD_IMAGE)
 	iverilog -g2005-sv $(FLAGS) -s $@ -o $@ $(INCLUDE) $(SUPER6502_FPGA_SOURCES) $(SIM_SOURCES) -I ../../
 
+$(SD_IMAGE):
+	dd if=/dev/urandom bs=1 count=65536 of=$(SD_IMAGE)
+
 # I feel like this should also realize that the outside files are newer...
 .PHONY: $(COPY_FILES)
 $(COPY_FILES): ../../$@

hw/super6502_fpga/src/sim/hvl/sim_top.sv

@@ -180,7 +180,8 @@ IOBUF dat_buf (
 );
 
 mdl_sdio #(
-    .LGMEMSZ(16)
+    .LGMEMSZ(16),
+    .MEMFILE("sd_image.bin")
 ) u_sd_card_emu (
     .sd_clk(o_sd_clk),
     .sd_cmd(w_sd_cmd),