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Porting FlashFS to use NANDFlash

Stefan Hartwig

Hi,
I adopted FlashFS to use my NANDFlash (9F2G08U0A).
finit() and fformat ("F:") are working fine and the flash gets erased.
But if I call fopen, to create files, I get linker error:

.\at91sam9260-sdram\at91sam9260-sdram.axf: Error: L6915E: Library reports error: __use_no_semihosting_swi was requested, but _sys_open was referenced


I got a retarget.c which implements _sys_open and many other _sys-functions:

FILEHANDLE _sys_open (const char *name, int openmode) {
   /* Register standard Input Output devices. */
   if (strcmp(name, "STDIN") == 0) {
      return (STDIN);
   }
   if (strcmp(name, "STDOUT") == 0) {
      return (STDOUT);
   }
   if (strcmp(name, "STDERR") == 0) {
      return (STDERR);
   }
   return (__fopen (name, openmode));
}

How can I compile my code without errors?

Parents
  • 0 in reply to Stefan Hartwig

    Stefan,

    Yesterday I made an attempt to get this to work, without much success: 'fformat' fails. this is what I have does:
    * Enabled SPI flash device in file_config.c
    * Added the functions you mentioned above with an empty implementation (returning 0)
    * called finit.

    I see that 'fs_spi_Init' is called after 'finit' is invoked, but calling 'fformat' fails hence 'fs_spi_EraseSector' is never called. Before I start digging into the assembly - did I miss something in the procedure?

    Thanks in advance

Reply
  • 0 in reply to Stefan Hartwig

    Stefan,

    Yesterday I made an attempt to get this to work, without much success: 'fformat' fails. this is what I have does:
    * Enabled SPI flash device in file_config.c
    * Added the functions you mentioned above with an empty implementation (returning 0)
    * called finit.

    I see that 'fs_spi_Init' is called after 'finit' is invoked, but calling 'fformat' fails hence 'fs_spi_EraseSector' is never called. Before I start digging into the assembly - did I miss something in the procedure?

    Thanks in advance

Children
  • 0 in reply to Tamir Michael

    Added the functions you mentioned above with an empty implementation

    You have to fill these functions with the necessary implementation for reading, writing, erasing and initializing the NANDFlash.
    The differnce is, that you use a spi flash device instead of a "normal" flash device.

  • 0 in reply to Stefan Hartwig

    Thanks for your reply. I understand this of course. I just wanted to see if the erase sector function is called - which is not the case (returning 0 from any of these functions is considered as success). So, 'fformat("F:");" with the settings above if sufficient and should work?
    I think I am going to try to convince the head of R&D to replace that flash chip. I mean, I have seen that FlashFS calls a function that is likely to attempt to configure the SPI bus when using these settings. I am worried about the side effects on our SPI chips and general maintainability.

  • 0 in reply to Tamir Michael

    Tamir,

    I would go with MCI + SDCard. It has the best performance/price ratio.
    I'm using the SDcard only for internal use replacing a NAND flash.

    Advantages:
    *MCI in 4 bits mode has the fastest speed.
    *The FS is FAT16/32, so you can read/write the info with a PC.
    *Easy to upgrade with more memory if is necessary.
    *SDcards are cheap.

  • 0 in reply to Leandro Gentili

    Leonardo,
    Thanks for your reply. My system already has an SD card plus a NAND flash and a NOR flash. something will have to go, and due to price considerations it is likely to be the SD card...

  • 0 in reply to Tamir Michael

    Another possibility is: to adapt FlashFS to support USB FLASH Memories (fs: FAT16/32), but you need an USB Host port in your MCU (i.e. LPC2388). I've done it and works at pretty good speeds: ~400KBytes/sec (write).