Web server using EPCS controller

What have you done to validate that your epcs_controller is functional? Booting from it will give you a reasonable degree of certainty, but I'd advocate running code from the memory test example on it as well.

One of the problems with the EPCS driver in a multitasking environment is that it isn't thread safe. The EPCS needs a series of instructions and will return a series of bytes for each request, and the transaction mustn't be interrupted by another one. If you have two threads that try to access the EPCS at the same time, both will get garbage data as a result. You should check if by any chance you could have another task that could try to access the EPCS or the file system just when you are answering to a http request (or have several parallel tasks that handle http requests, but it doesn't seem to be the case in this code). If yes then you need either to allow only one task to access the EPCS, or add a synchronization system in the driver (mutexes) to prevent this from happening.

Hi abubaha,I had similar corruption as you....I believe I know what the problem is..will post back when I've checked the solution

update....i wish i could read, i see that you have an update issue...i may be looking at that in the future, if i detect any problems i'll post back...i need do some download tests before....

  if (ALTERA_RO_ZIPFS_BASE == EPCS_FLASH_CONTROLLER_BASE)
    {
        alt_u32 RetValue;
        alt_u32 Offset = (current - ALTERA_RO_ZIPFS_BASE);
        alt_flash_dev *fdev = alt_flash_open_dev("/dev/epcs_flash_controller\0");
        //Do EPCS Flash Read
        alt_epcs_flash_read(fdev, Offset, (void*)current, amount_to_copy);
        alt_flash_close_dev(fdev);
    }
      else
      {
      }
  memcpy(ptr, current, amount_to_copy);
  return amount_to_copy;

  if (ALTERA_RO_ZIPFS_BASE == EPCS_FLASH_CONTROLLER_BASE)  /* i.e. if serial flash */
    {
        /* serial flash */
        alt_u32 Offset = (current - ALTERA_RO_ZIPFS_BASE);
        alt_flash_dev *fdev = alt_flash_open_dev("/dev/epcs_flash_controller\0");
        // TODO should check for open and read errors
        // Do EPCS Flash Read 
        alt_epcs_flash_read(fdev, Offset, (char*)ptr , amount_to_copy);
        alt_flash_close_dev(fdev);
    }
    else   /* memory mapped i.e. parallel flash */
    {
        memcpy(ptr, current, amount_to_copy);
    }
  return amount_to_copy;

Hi Rick101,