eMMC with SDIO

[l90mehdi]

Hello every one 
I want to use EMMC instead of SD card with SDIO interface with STM32F407VET6. 
I have tried SD 1bit and 4bits wide bus. (I am choosing SD to enable FATFS)

First I've used f_mkfs to create a File System on the eMMC. It returns FR_OK. And then f_mount to mount the eMMC.

The problem is, the f_mount returns FR_DISK_ERROR and cannot mount the eMMC.

My point is testing the board that if I can communicate with the eMMC or not and then using a file system to store files on it. First I'm looking for a way to make sure that my hardware works and I need help for that.

FATFS fatfs;
FIL TestFile;
UINT bw, br;
FRESULT fresult;
BYTE work[4096];

fresult = f_mkfs ("", NULL, 16384, work, sizeof work);
fresult = f_mount (&fatfs, "", 1);