Flash Memory

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First of all init the flash device and possibly get extra info about the flash device, like block size:

    flash_region   *regions;
    int            numRegions;
    int  error = 0;
    pFlashDevice = alt_flash_open_dev(FLASH_CONTROLLER_NAME);
    if (pFlashDevice <= 0)
        error = -1;
    if (!error) 
        error = alt_epcs_flash_get_info(pFlashDevice, &regions, &numRegions);
     if (!error) {
        flash_block_size = regions->block_size;
        flash_max_addr = regions->region_size;

i am using cfi, is it the same? besides, my pflashdevice is <= 0. i dunno why. is it sth to do with reset vector as my reset vector is sdram.

This is for writing any data to a previously erased area:

int buf = { 1, 2,3,4,5,6,7,8,9,10 };
rv = alt_epcs_flash_write_block(pFlashDevice, block_address,
         data_offset_inside_block , buf, 10);

why need rv when write data?

Then, read back data with:

alt_epcs_flash_read(pFlashDevice, addr, buf, len);

where is the data when we read it from the flash? like i want to print out the data.

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please help me with the ques in bold. thanks!