SD card is sucessfully read in DS mode!

arm9/source/driveOperations.cpp

@@ -153,9 +153,9 @@ TWL_CODE void nandUnmount(void) {
 }
 
 bool sdMount(void) {
-	extern const DISC_INTERFACE __io_dsisd;
+	extern const DISC_INTERFACE __my_io_dsisd;
 
-	fatMountSimple("sd", &__io_dsisd);
+	fatMountSimple("sd", &__my_io_dsisd);
 	if (sdFound()) {
 		sdMountedDone = true;
 		fatGetVolumeLabel("sd", sdLabel);

arm9/source/my_sd.c

@@ -0,0 +1,101 @@
+#include <nds/disc_io.h>
+#include <nds/fifocommon.h>
+#include <nds/fifomessages.h>
+#include <nds/system.h>
+#include <nds/arm9/cache.h>
+
+//---------------------------------------------------------------------------------
+bool my_sdio_Startup() {
+//---------------------------------------------------------------------------------
+	fifoSendValue32(FIFO_SDMMC,SDMMC_HAVE_SD);
+	while(!fifoCheckValue32(FIFO_SDMMC));
+	int result = fifoGetValue32(FIFO_SDMMC);
+
+	if(result==0) return false;
+
+	fifoSendValue32(FIFO_SDMMC,SDMMC_SD_START);
+
+	fifoWaitValue32(FIFO_SDMMC);
+
+	result = fifoGetValue32(FIFO_SDMMC);
+
+	return result == 0;
+}
+
+//---------------------------------------------------------------------------------
+bool my_sdio_IsInserted() {
+//---------------------------------------------------------------------------------
+	fifoSendValue32(FIFO_SDMMC,SDMMC_SD_IS_INSERTED);
+
+	fifoWaitValue32(FIFO_SDMMC);
+
+	int result = fifoGetValue32(FIFO_SDMMC);
+
+	return result == 1;
+}
+
+//---------------------------------------------------------------------------------
+bool my_sdio_ReadSectors(sec_t sector, sec_t numSectors,void* buffer) {
+//---------------------------------------------------------------------------------
+	FifoMessage msg;
+
+	DC_FlushRange(buffer,numSectors * 512);
+
+	msg.type = SDMMC_SD_READ_SECTORS;
+	msg.sdParams.startsector = sector;
+	msg.sdParams.numsectors = numSectors;
+	msg.sdParams.buffer = buffer;
+	
+	fifoSendDatamsg(FIFO_SDMMC, sizeof(msg), (u8*)&msg);
+
+	fifoWaitValue32(FIFO_SDMMC);
+
+	int result = fifoGetValue32(FIFO_SDMMC);
+	
+	return result == 0;
+}
+
+//---------------------------------------------------------------------------------
+bool my_sdio_WriteSectors(sec_t sector, sec_t numSectors,const void* buffer) {
+//---------------------------------------------------------------------------------
+	FifoMessage msg;
+
+	DC_FlushRange(buffer,numSectors * 512);
+
+	msg.type = SDMMC_SD_WRITE_SECTORS;
+	msg.sdParams.startsector = sector;
+	msg.sdParams.numsectors = numSectors;
+	msg.sdParams.buffer = (void*)buffer;
+	
+	fifoSendDatamsg(FIFO_SDMMC, sizeof(msg), (u8*)&msg);
+
+	fifoWaitValue32(FIFO_SDMMC);
+
+	int result = fifoGetValue32(FIFO_SDMMC);
+	
+	return result == 0;
+}
+
+
+//---------------------------------------------------------------------------------
+bool my_sdio_ClearStatus() {
+//---------------------------------------------------------------------------------
+	return true;
+}
+
+//---------------------------------------------------------------------------------
+bool my_sdio_Shutdown() {
+//---------------------------------------------------------------------------------
+	return true;
+}
+
+const DISC_INTERFACE __my_io_dsisd = {
+	DEVICE_TYPE_DSI_SD,
+	FEATURE_MEDIUM_CANREAD | FEATURE_MEDIUM_CANWRITE,
+	(FN_MEDIUM_STARTUP)&my_sdio_Startup,
+	(FN_MEDIUM_ISINSERTED)&my_sdio_IsInserted,
+	(FN_MEDIUM_READSECTORS)&my_sdio_ReadSectors,
+	(FN_MEDIUM_WRITESECTORS)&my_sdio_WriteSectors,
+	(FN_MEDIUM_CLEARSTATUS)&my_sdio_ClearStatus,
+	(FN_MEDIUM_SHUTDOWN)&my_sdio_Shutdown
+};