--- a/drivers/nvram_file/nvram_file.c	Thu May 18 21:56:59 2006 +0200
+++ b/drivers/nvram_file/nvram_file.c	Fri May 19 20:20:06 2006 +0200
@@ -0,0 +1,114 @@
+#include <stdio.h>
+
+
+/* size of NVRAM in bytes */
+#define NVRAM_MAX_SIZE 262144
+
+/* size of block in byte */
+#define NVRAM_BLOCK_SIZE 256
+
+#define NVRAM_FILE_NAME "__nvram__"
+
+FILE *nvram_file = NULL;
+
+
+void iat_flash_read_regs();
+void iat_flash_write_regs();
+void iat_flash_write_page(unsigned int);
+void iat_flash_read_page(unsigned int);
+
+
+short data_len; /* 0 to NVRAM_BLOCK_SIZE bytes */
+short data_num_pages;
+unsigned int *data_page = NULL;
+unsigned int data_addr;
+
+unsigned int *regs_page = NULL;
+
+int iat_init()
+{
+	int i;
+
+	nvram_file = fopen(NVRAM_FILE_NAME, "wr");
+	if (nvram_file  == NULL)
+		return -1;
+
+	int n = NVRAM_BLOCK_SIZE / sizeof(unsigned int);
+
+	/* some actions to initialise the flash */
+	data_len = 0;
+	data_num_pages = 0;
+
+	data_page = (unsigned int *)malloc(sizeof(unsigned int) * n);
+	memset(data_page, 0, sizeof(unsigned int)*n);
+
+	if (data_page == NULL)
+		return -1;
+
+	regs_page = (unsigned int *)malloc(sizeof(unsigned int) * n);
+	memset(regs_page, 0, sizeof(unsigned int)*n);
+	if (regs_page == NULL)
+		return -2;
+
+	iat_flash_read_regs();
+
+	/* start the data at the location specified in the registers */ 
+	if (0) /* for now it is 0, but put here a test to know whether
+                  or not the NVRAM has been written before */
+		data_addr = regs_page[1];
+	else
+		data_addr = NVRAM_BLOCK_SIZE; /* let start at block 1 */
+
+	/* create a file the size of the simulated NVRAM */
+	for(i=0; i<NVRAM_MAX_SIZE/NVRAM_BLOCK_SIZE + 1; i++)
+		fwrite(data_page, sizeof(unsigned int), n, nvram_file);
+
+	return 0;
+}
+
+
+void iat_end()
+{
+	iat_flash_write_page(data_addr);
+
+	iat_flash_write_regs();
+
+	fclose(nvram_file);
+}
+
+ 
+void iat_flash_read_regs()
+{
+	fseek(nvram_file, 0, SEEK_SET);
+	fread(regs_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
+}
+
+
+void iat_flash_write_regs()
+{
+	fseek(nvram_file, 0, SEEK_SET);
+	fwrite(regs_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
+}
+
+
+void iat_flash_read_page(unsigned int addr)
+{
+	fseek(nvram_file, addr*sizeof(unsigned int), SEEK_SET);
+	fread(data_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
+}
+
+
+void iat_flash_write_page(unsigned int addr)
+{
+	fseek(nvram_file, addr*sizeof(unsigned int), SEEK_SET);
+	fwrite(data_page, sizeof(unsigned int), NVRAM_BLOCK_SIZE, nvram_file);
+}
+
+
+/*------------------------------------------------------*/
+int main()
+{
+	iat_init();
+	iat_end();
+}
+/*------------------------------------------------------*/