I assumed that the MAC is held in extended memory like the Atmel parts
(otherwise, not much in the previous email makes sense).
183 /* Put the AT24 back in normal memory access mode */
184
185 ret = at24->ioctl(at24, MTDIOC_EXTENDED, 0);
186 if (ret < 0)
187 {
188 nerr("ERROR: AT24 ioctl(MTDIOC_EXTENDED) failed: %d\n",
ret);
189 }
...
Then the normal memory should be accessible to applications via the AT24
character driver as Alan discussed.
The MAC address could also be obtained and set in the application (vs.
board bring-up) using a special IOCTL command support by the AT24xx.c
serial driver at drivers/mtd:
638 #ifdef CONFIG_AT24XX_EXTENDED
639 case MTDIOC_EXTENDED:
640 priv->extended = (arg != 0);
641 ret = OK;
642 break;
643 #endif
