RL-FlashFS with File I/O Routines and USB-MSC Device

Hi

I am using a STM32F4xx part.
One part of the application makes use of the USB-MSC functionality (the ST supplied USB lib modified to run the RTX) using the Keil supplied SD/SDIO MMC Interface Driver for ST STM32F4xx.
The SD routines ioc_read_sect, ioc_write_sect etc - all work fine. The whole USB device mode MSC functionality all works - no problems there.

Additionally I also want to use the Keil file I/O routines - ffind, fopen,fgets etc.
My startup looks like this

FAT_VI *mc0;                            /* FAT Media Control Block            */
Media_INFO info;                        /* Media information                  */

__task void init (void)
{

        t_UsbdDataOutTask        = os_tsk_create (UsbdDataOutTask,    4);
        t_UsbdDataInTask         = os_tsk_create (UsbdDataInTask,     4);
        t_UsbdSetupStageTask     = os_tsk_create (UsbdSetupStageTask, 4);
        t_UsbdDeviceTask         = os_tsk_create (UsbdDeviceTask,     6);

        finit (NULL);

        mc0 = ioc_getcb (NULL);

        if (ioc_init (mc0) != 0)
                {
                }

        ioc_read_info (&info, mc0);

        USBD_Init(&USB_OTG_dev,USB_OTG_FS_CORE_ID,&USR_desc,&USBD_MSC_cb,&USR_cb);

        t_LedTickTask                   =       os_tsk_create (LedTickTask,         2);
        t_MallocFreeTask                =       os_tsk_create (MallocFreeTask,      4);
        t_LedDspQTask                   =       os_tsk_create (LedDspQTask,         5);
        t_LedDspTimerTask               =       os_tsk_create (LedDspTimerTask,     5);
        t_ShowTimeTask                  =       os_tsk_create (ShowTimeTask,        5);
        t_SpinImageLoaderTask           =       os_tsk_create (SpinImageLoaderTask, 5);

        os_tsk_delete_self ();
}

When I compile and run my app - the USB MSC functionality all works - but all SD disk - file I/O routines fail - ffind, fopen,fgets etc.

If I take out this code

        mc0 = ioc_getcb (NULL);
        if (ioc_init (mc0) != 0)
           {
           }

        ioc_read_info (&info, mc0);

then the file I/O routines all work - but the USB MSC functionality does not.

My question is simple - how do I make both work - if possible?

Thanks Peter