55 

    56 

    57 int iat_init()

    58 {

    59 	int n = NVRAM_BLOCK_SIZE / sizeof(unsigned int);

    60 

    61 	/* some actions to initialise the flash */

    62 	data_len = 0;

    63 	data_num_pages = 0;

    64 

    65 	data_page = (unsigned int *)malloc(sizeof(unsigned int) * n);

    66 	memset(data_page, 0, sizeof(unsigned int)*n);

    67 

    68 	if (data_page == NULL)

    69 		return -1;

    70 

    71 	regs_page = (unsigned int *)malloc(sizeof(unsigned int) * n);

    72 	memset(regs_page, 0, sizeof(unsigned int)*n);

    73 	if (regs_page == NULL)

    74 		return -2;

    75 

    76 	iat_flash_read_regs();

    77 

    78 	/* start the data at the location specified in the registers */ 

    79 	if (0) /* for now it is 0, but put here a test to know whether

    80                   or not the NVRAM has been written before */

    81 		data_addr = regs_page[1];

    82 	else

    83 		data_addr = NVRAM_BLOCK_SIZE; /* let start at block 1 */

    84 

    85 	return 0;

    86 }

    87 

    88 

    89 void iat_end()

    90 {

    91 	/* write the last page before closing */

    92 	iat_flash_write_page(data_addr);

    93 

    94 	/* some actions to end accessing the flash */

    95 	free(data_page);

    96 

    97 	regs_page[4] = data_num_pages;

    98 	/* write the registers to the NVRAM before closing */

    99 	iat_flash_write_regs();

   100 	free(regs_page);

   101 }