add drive to access an area on emmc/sd as disk

nyx/Makefile

@@ -41,7 +41,7 @@ OBJS += $(addprefix $(BUILDDIR)/$(TARGET)/, \
 	bm92t36.o bq24193.o max17050.o max7762x.o max77620-rtc.o regulator_5v.o \
 	touch.o joycon.o tmp451.o fan.o \
 	usbd.o xusbd.o usb_descriptors.o usb_gadget_ums.o usb_gadget_hid.o \
-	hw_init.o boot_storage.o \
+	hw_init.o boot_storage.o sfd.o\
 )
 
 # Utilities.

nyx/nyx_gui/libs/fatfs/diskio.c

@@ -16,6 +16,7 @@
 
 #include <libs/fatfs/diskio.h>	/* FatFs lower layer API */
 #include <fatfs_cfg.h>
+#include "../../storage/sfd.h"
 
 static u32 sd_rsvd_sectors = 0;
 static u32 ramdisk_sectors = 0;
@@ -35,6 +36,7 @@ static bool ensure_partition(BYTE pdrv){
 	case DRIVE_RAM:
 	case DRIVE_BIS:
 	case DRIVE_EMU:
+	case DRIVE_SFD:
 		return true;
 	default:
 		return false;
@@ -96,6 +98,8 @@ DRESULT disk_read (
 		return sdmmc_storage_read(&emmc_storage, sector + (0x100000 / 512), count, buff) ? RES_OK : RES_ERROR;
 	case DRIVE_BOOT1:
 		return sdmmc_storage_read(&emmc_storage, sector, count, buff) ? RES_OK : RES_ERROR;
+	case DRIVE_SFD:
+		return sfd_read(sector, count ,buff) ? RES_OK : RES_ERROR;
 	}
 
 	return RES_ERROR;
@@ -130,6 +134,8 @@ DRESULT disk_write (
 		return sdmmc_storage_write(&emmc_storage, sector + (0x100000 / 512), count, (void*)buff) ? RES_OK : RES_ERROR;
 	case DRIVE_BOOT1:
 		return sdmmc_storage_write(&emmc_storage, sector, count, (void*)buff) ? RES_OK : RES_ERROR;
+	case DRIVE_SFD:
+		return sfd_write(sector, count, (void*)buff) ? RES_OK : RES_ERROR;
 	}
 
 	return RES_ERROR;

nyx/nyx_gui/libs/fatfs/ffconf.h

@@ -179,13 +179,13 @@
 / Drive/Volume Configurations
 /---------------------------------------------------------------------------*/
 
-#define FF_VOLUMES		7
+#define FF_VOLUMES		8
 /* Number of volumes (logical drives) to be used. (1-10) */
 
 
 #define FF_STR_VOLUME_ID	1
 // Order is important. Any change to order, must also be reflected to diskio drive enum.
-#define FF_VOLUME_STRS		"sd","ram","emmc","bis","emu", "boot1", "boot1_1mb"
+#define FF_VOLUME_STRS		"sd","ram","emmc","bis","emu", "boot1", "boot1_1mb", "sfd"
 /* FF_STR_VOLUME_ID switches support for volume ID in arbitrary strings.
 /  When FF_STR_VOLUME_ID is set to 1 or 2, arbitrary strings can be used as drive
 /  number in the path name. FF_VOLUME_STRS defines the volume ID strings for each
@@ -309,6 +309,7 @@ typedef enum {
 	DRIVE_EMU       = 4,
 	DRIVE_BOOT1     = 5,
 	DRIVE_BOOT1_1MB = 6,
+	DRIVE_SFD       = 7,
 } DDRIVE;
 
 /*--- End of configuration options ---*/

nyx/nyx_gui/storage/sfd.c

@@ -0,0 +1,42 @@
+#include "sfd.h"
+#include <storage/emmc.h>
+#include <storage/sdmmc.h>
+
+static sdmmc_storage_t *_storage;
+static u32 _offset;
+static u32 _size;
+
+static void ensure_partition(){
+	if(_storage == &emmc_storage){
+		emmc_set_partition(EMMC_GPP);
+	}
+}
+
+int sfd_read(u32 sector, u32 count, void *buff){
+	if(sector + _offset + count > _offset + _size){
+		return 0;
+	}
+	ensure_partition();
+	return sdmmc_storage_read(_storage, sector + _offset, count, buff);
+}
+
+int sfd_write(u32 sector, u32 count, void *buff){
+	if(sector + _offset + count > _offset + _size){
+		return 0;
+	}
+	ensure_partition();
+	return sdmmc_storage_write(_storage, sector + _offset, count, buff);
+}
+
+bool sfd_init(sdmmc_storage_t *storage, u32 offset, u32 size){
+	_storage = storage;
+	_offset = offset;
+	_size = size;
+	return true;
+}
+
+void sfd_end(){
+	_storage = NULL;
+	_offset = 0;
+	_size = 0;
+}

nyx/nyx_gui/storage/sfd.h

@@ -0,0 +1,14 @@
+#ifndef _SFD_H
+#define _SFD_H
+
+#include <storage/sdmmc.h>
+#include <utils/types.h>
+
+int sfd_read(u32 sector, u32 count, void *buff);
+int sfd_write(u32 sector, u32 count, void *buff);
+
+bool sfd_init(sdmmc_storage_t *storage, u32 offset, u32 size);
+void sfd_end();
+
+
+#endif