SPEAr : Support for HW mac id read/write from i2c mem

This patch adds the support to read and write mac id from i2c memory.
For reading:
if (env contains ethaddr)
pick env ethaddr
else
pick ethaddr from i2c memory
For writing:
chip_config ethaddr XX:XX:XX:XX:XX:XX writes the mac id in i2c memory

---
  board/spear/common/spr_misc.c |   69 ++++++++++++++++++++++++++++++++++++++++-
  1 files changed, 68 insertions(+), 1 deletions(-)

index d70252b..9a6260f 100755
@@ -62,6 +62,12 @@ int dram_init(void)
 
  int misc_init_r(void)
  {
+#if defined(CONFIG_CMD_NET)
+	uchar mac_id[6];
+
+	if (!eth_getenv_enetaddr("ethaddr", mac_id) && !i2c_read_mac(mac_id))
+		eth_setenv_enetaddr("ethaddr", mac_id);
+#endif
  	setenv("verify", "n");
 
  #if defined(CONFIG_SPEAR_USBTTY)

@@ -96,6 +102,46 @@ int spear_board_init(ulong mach_type)
  	return 0;
  }
 
+static int i2c_read_mac(uchar *buffer)
+{
+	u8 buf[2];
+
+	i2c_read(0x50, 0x0, 1, buf, 2);
 

Change 0x50 to #define board/soc specific i2c address for MAC Apply gobally

+
+ /* Check if mac in i2c memory is valid */
+ if ((buf[0] == 0x55) && (buf[1] == 0xAA)) {
+ /* Valid mac address is saved in i2c eeprom */
+ i2c_read(0x50, 0x2, 1, buffer, 6);
+ return 0;
+ }
+
+ return -1;
+}
+
+static int write_mac(uchar *mac)
+{
+ unsigned char buf[2];
+
+ buf[0] = 0x55;
+ buf[1] = 0xAA;
+ i2c_write(0x50, 0x0, 1, buf, 2);
+
+ buf[0] = 0x44;
+ buf[1] = 0x66;

May want to change these to #defines

Tom