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diff --git a/os/various/fatfs_bindings/fatfs_devices.h b/os/various/fatfs_bindings/fatfs_devices.h
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+/*
+ ChibiOS - Copyright (C) 2006..2017 Giovanni Di Sirio
+ Copyright (C) 2015..2017 Diego Ismirlian, (dismirlian (at) google's mail)
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+#ifndef FATFS_DEVICES_H_
+#define FATFS_DEVICES_H_
+
+#include "hal.h"
+
+#if HAL_USE_MMC_SPI && HAL_USE_SDC
+#error "cannot specify both MMC_SPI and SDC drivers"
+#endif
+
+#if HAL_USE_MMC_SPI
+extern MMCDriver MMCD1;
+#elif HAL_USE_SDC
+extern SDCDriver SDCD1;
+#elif HAL_USBH_USE_MSD
+
+#else
+#error "MMC_SPI, SDC or USBH_MSD driver must be specified"
+#endif
+
+/*-----------------------------------------------------------------------*/
+/* Correspondence between physical drive number and physical drive. */
+#if HAL_USE_MMC_SPI
+#define FATFSDEV_MMC 0
+#define FATFSDEV_MMC_DRIVE "0:"
+#endif
+
+#if HAL_USE_SDC
+#define FATFSDEV_SDC 0
+#define FATFSDEV_SDC_DRIVE "0:"
+#endif
+
+#if HAL_USBH_USE_MSD
+#if defined(FATFSDEV_MMC) || defined(FATFSDEV_SDC)
+#define FATFSDEV_MSDLUN0 1
+#define FATFSDEV_MSDLUN0_DRIVE "1:"
+#else
+#define FATFSDEV_MSDLUN0 0
+#define FATFSDEV_MSDLUN0_DRIVE "0:"
+#endif
+#endif
+
+#endif /* FATFS_DEVICES_H_ */