Access the EMMC flash on VxWorks

Question

I want to access my EMMC from my VxWorks Software.

My hardware is - Kontron SMARC-sAMX6i

My VxWorks version - 6.9

I have formatted my EMMC to FAT32 using a Linux computer, and I can access it on the UBOOT stage using a micro USB and these 2 commands on UBOOT:

mmc dev 2.
ums 0 mmc 2.

When my VxWorks OS loaded I can see it recognized("/mmc0:0") my device using "devs" on VxWorks Shell:

drv name
  0 /null
  1 /tyCo/0
  1 /tyCo/1
  1 /tyCo/2
  7 /sysNvRam
  7 /usrNvRam
  8 /hal
  9 /i2c0
  9 /i2c1
  9 /i2c2
 11 /vio
 12 /tgtsvr
  3 /ram0
  3 /sd
  4 /mmc0:0
value = 25 = 0x19

The problem is when my VxWorks OS is loaded I can't access my EMMC using VxWorks Shell and commit commands such as "ls" or "cd". I have tried to format it from the VxWorks shell as DOSFS using "dosFsVolFormat" but every time the format is finished it initiated again to raw FS.

Example from VxWorks Shell:

dosFsVolFormat "/mmc0:0"
Formatting /mmc0:0 for DOSFS
Instantiating /mmc0:0 as rawFs, device = 0x60001
Formatting...Retrieved old volume params with %70 confidence:
Volume Parameters: FAT type: FAT32, sectors per cluster 0
  0 FAT copies, 0 clusters, 4192 sectors per FAT
  Sectors reserved 0, hidden 0, FAT sectors 0
  Root dir entries 0, sysId (null)  , serial number 40002004
  Label:"           " ...
Disk with 7438336 sectors of 512 bytes will be formatted with:
Volume Parameters: FAT type: FAT32, sectors per cluster 8
  2 FAT copies, 927972 clusters, 7264 sectors per FAT
  Sectors reserved 32, hidden 0, FAT sectors 14528
  Root dir entries 0, sysId VX5DOS32, serial number 40002004
  Label:"           " ...
Instantiating /mmc0:0 as rawFs,  device = 0x60001
OK.
value = 0 = 0x0

I am very confused about this problem and haven't succeeded to find any solution for it I will be happy for any advice or guidance.

Thanks for your Help.