Using RL-FlashFS

Thank you for the hint. Now the described problem is gone, but there are new ones.
I initialize the file system with finit() and then i perform a check with fcheck(). This works without failure. Then I try to open a file and get an abort. But this happens only if I run to a breakpoint after the open call. When I put a breakpoint into the fs_ProgramPage function and code execution stops there is no abort and I get a valid Pointer from the fopen function.

fs_ProgramPage, fs_EraseSector, fs_Init are relocated into RAM. fs_ProgramPage calls a swi which calls the flash programming routine. The abort occurs somewhere after the return from fs_ProgrammPage. Here is the code:

int __swi(8) program_page (U32 adr, U32 sz, U8 *buf);
int __SWI_8 (U32 adr, U32 sz, U8 *buf)  {

        unsigned long   page;
        unsigned long * Flash;

        Flash = (unsigned long *)adr;
        page  = (adr - FLASH_BASE_ADDRESS) / FLASH_PAGE_SIZE_BYTE;

        // Unlock Page Command
        AT91C_BASE_MC->MC_FCR = AT91C_MC_CORRECT_KEY | AT91C_MC_FCMD_UNLOCK |
                         (AT91C_MC_PAGEN & (page << 8));

        // Wait until the end of Command
        while ((AT91C_BASE_MC->MC_FSR & AT91C_MC_FRDY) != AT91C_MC_FRDY);

        // Copy to the Write Buffer
        for (sz = (sz + 3) & ~3; sz; sz -= 4, buf += 4)
        {
                *Flash++ = *((unsigned long *)buf);
        }
        //* Start Programming Command
        AT91C_BASE_MC->MC_FCR = AT91C_MC_CORRECT_KEY | AT91C_MC_FCMD_START_PROG |
                         (AT91C_MC_PAGEN & (page << 8));

        // Wait until the end of Command
        while ((AT91C_BASE_MC->MC_FSR & AT91C_MC_FRDY) != AT91C_MC_FRDY);

    // Check for Errors
        if (AT91C_BASE_MC->MC_FSR & (AT91C_MC_PROGE | AT91C_MC_LOCKE))
                return 1;
        return 0;
}


/*--------------------------- fs_Init ---------------------------------------*/

int fs_Init (U32 adr, U32 clk) {
        /* Library default fs_Init function. */
        unsigned long clkus;


        // Calculate Flash Microsecond Cycle Number - Approximate (no Library Code)
//      clkus = (1074*(clk >> 10)) >> 20;            // Master Clock Cycles in 1.0us
        clkus = (1611*(clk >> 10)) >> 20;            // Master Clock Cycles in 1.5us

        // Set Flash Microsecond Cycle Number
        // Set Flash Waite State to max. (Single Cycle Access at Up to 30 MHz)
        AT91C_BASE_MC->MC_FMR = ((AT91C_MC_FMCN) & (clkus << 16)) | AT91C_MC_FWS_3FWS;
        return (0);
}


/*--------------------------- fs_EraseSector --------------------------------*/

int fs_EraseSector (U32 adr)  {
   /* Library default fs_EraseSector function. */

        return (0);                  // Automatic Erase during Program Cycle
}


/*--------------------------- fs_ProgramPage --------------------------------*/
/*
 *    Program Page in Flash Memory
 *    Parameter:      adr:  Page Start Address
 *                    sz:   Page Size
 *                    buf:  Page Data
 *    Return Value:   0 - OK,  1 - Failed
 */

int fs_ProgramPage (U32 adr, U32 sz, U8 *buf)  {
   /* Library default fs_ProgramPage function. */

   unsigned int ret;

   ret = program_page(adr,sz,buf);

   return ret;
}

I don't understand what happens and how I can find out what happens. I am just starting to work with arm based controllers.

Best regards
Karsten Loof

Thank you for the hint. Now the described problem is gone, but there are new ones.
I initialize the file system with finit() and then i perform a check with fcheck(). This works without failure. Then I try to open a file and get an abort. But this happens only if I run to a breakpoint after the open call. When I put a breakpoint into the fs_ProgramPage function and code execution stops there is no abort and I get a valid Pointer from the fopen function.

fs_ProgramPage, fs_EraseSector, fs_Init are relocated into RAM. fs_ProgramPage calls a swi which calls the flash programming routine. The abort occurs somewhere after the return from fs_ProgrammPage. Here is the code:

int __swi(8) program_page (U32 adr, U32 sz, U8 *buf);
int __SWI_8 (U32 adr, U32 sz, U8 *buf)  {

        unsigned long   page;
        unsigned long * Flash;

        Flash = (unsigned long *)adr;
        page  = (adr - FLASH_BASE_ADDRESS) / FLASH_PAGE_SIZE_BYTE;

        // Unlock Page Command
        AT91C_BASE_MC->MC_FCR = AT91C_MC_CORRECT_KEY | AT91C_MC_FCMD_UNLOCK |
                         (AT91C_MC_PAGEN & (page << 8));

        // Wait until the end of Command
        while ((AT91C_BASE_MC->MC_FSR & AT91C_MC_FRDY) != AT91C_MC_FRDY);

        // Copy to the Write Buffer
        for (sz = (sz + 3) & ~3; sz; sz -= 4, buf += 4)
        {
                *Flash++ = *((unsigned long *)buf);
        }
        //* Start Programming Command
        AT91C_BASE_MC->MC_FCR = AT91C_MC_CORRECT_KEY | AT91C_MC_FCMD_START_PROG |
                         (AT91C_MC_PAGEN & (page << 8));

        // Wait until the end of Command
        while ((AT91C_BASE_MC->MC_FSR & AT91C_MC_FRDY) != AT91C_MC_FRDY);

    // Check for Errors
        if (AT91C_BASE_MC->MC_FSR & (AT91C_MC_PROGE | AT91C_MC_LOCKE))
                return 1;
        return 0;
}


/*--------------------------- fs_Init ---------------------------------------*/

int fs_Init (U32 adr, U32 clk) {
        /* Library default fs_Init function. */
        unsigned long clkus;


        // Calculate Flash Microsecond Cycle Number - Approximate (no Library Code)
//      clkus = (1074*(clk >> 10)) >> 20;            // Master Clock Cycles in 1.0us
        clkus = (1611*(clk >> 10)) >> 20;            // Master Clock Cycles in 1.5us

        // Set Flash Microsecond Cycle Number
        // Set Flash Waite State to max. (Single Cycle Access at Up to 30 MHz)
        AT91C_BASE_MC->MC_FMR = ((AT91C_MC_FMCN) & (clkus << 16)) | AT91C_MC_FWS_3FWS;
        return (0);
}


/*--------------------------- fs_EraseSector --------------------------------*/

int fs_EraseSector (U32 adr)  {
   /* Library default fs_EraseSector function. */

        return (0);                  // Automatic Erase during Program Cycle
}


/*--------------------------- fs_ProgramPage --------------------------------*/
/*
 *    Program Page in Flash Memory
 *    Parameter:      adr:  Page Start Address
 *                    sz:   Page Size
 *                    buf:  Page Data
 *    Return Value:   0 - OK,  1 - Failed
 */

int fs_ProgramPage (U32 adr, U32 sz, U8 *buf)  {
   /* Library default fs_ProgramPage function. */

   unsigned int ret;

   ret = program_page(adr,sz,buf);

   return ret;
}

I don't understand what happens and how I can find out what happens. I am just starting to work with arm based controllers.

Best regards
Karsten Loof

Maybe you are returning from program_page() too early. If the flash programming has not finished yet, you might get abort in the return. This also explains why it works if you set a breakpoint into this function where you wait and then single step.

Franc