Ethernet MAC address - Revision history

JulienB at 13:44, 14 January 2011

2011-01-14T13:44:25Z

← Older revision		Revision as of 15:44, 14 January 2011
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	</pre>		</pre>
	XX:XX:XX being the board specific address.		XX:XX:XX being the board specific address.


	== Change MAC address ==		== Change MAC address ==
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	BIOS>		BIOS>
	</pre>		</pre>


	== Check your MAC address in Linux ==		== Check your MAC address in Linux ==

JulienB: /* Hardware */

2011-01-14T13:42:22Z

Hardware

← Older revision		Revision as of 15:42, 14 January 2011
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	=== Hardware ===		=== Hardware ===
	The APF27 and newer boards have an ~~ethernet~~ MAC address burned into the processor during the production process. This address can not be changed anymore.		{{Note\|The [[APF27]], the [[APF51]] and newer boards have an Ethernet MAC address burned into the processor during the production process. '''This hardware address can not be changed anymore'''. Though this address can be overloaded by software if needed.}}

	Armadeus APF9328 board has a separate MAC controller, the DM9000 chip from Davicom [http://www.davicom.com.tw/userfile/24247/DM9000-DS-F03-041906_1.pdf]. The [http://www.armadeus.com/_downloads/apf9328/hardware/apf_schema.pdf APF schematic], page 10, shows the implementation of the chip with an EEPROM chip to store its parameters, including MAC address.		Armadeus [[APF9328]] board has a separate MAC controller, the DM9000 chip from Davicom [http://www.davicom.com.tw/userfile/24247/DM9000-DS-F03-041906_1.pdf]. The [http://www.armadeus.com/_downloads/apf9328/hardware/apf_schema.pdf APF schematic], page 10, shows the implementation of the chip with an EEPROM chip to store its parameters, including MAC address.

	=== U-boot ===		=== U-boot ===

Salocin68 at 12:37, 15 August 2010

2010-08-15T12:37:26Z

← Older revision		Revision as of 14:37, 15 August 2010
Line 5:		Line 5:

	=== Hardware ===		=== Hardware ===
			The APF27 and newer boards have an ethernet MAC address burned into the processor during the production process. This address can not be changed anymore.

	Armadeus APF9328 board has a separate MAC controller, the DM9000 chip from Davicom [http://www.davicom.com.tw/userfile/24247/DM9000-DS-F03-041906_1.pdf]. The [http://www.armadeus.com/_downloads/apf9328/hardware/apf_schema.pdf APF schematic], page 10, shows the implementation of the chip with an EEPROM chip to store its parameters, including MAC address.		Armadeus APF9328 board has a separate MAC controller, the DM9000 chip from Davicom [http://www.davicom.com.tw/userfile/24247/DM9000-DS-F03-041906_1.pdf]. The [http://www.armadeus.com/_downloads/apf9328/hardware/apf_schema.pdf APF schematic], page 10, shows the implementation of the chip with an EEPROM chip to store its parameters, including MAC address.

JulienC: Ethernet MAC address details and how to change it on APF9328

2009-03-04T09:24:43Z

Ethernet MAC address details and how to change it on APF9328

New page

If, for any reasons, you want to change your board Ethernet MAC address, here is the procedure.

== Introduction ==
Every network card has a [[wikipedia:MAC address|MAC address]] to identify itself on the network. The MAC address first three octets are known as the [[wikipedia:Organizationally Unique Identifier|Organizationally Unique Identifier]]. Armadeus OUI is 00:1E:AC [http://www.coffer.com/mac_find/?string=Armadeus]

=== Hardware ===
Armadeus APF9328 board has a separate MAC controller, the DM9000 chip from Davicom [http://www.davicom.com.tw/userfile/24247/DM9000-DS-F03-041906_1.pdf]. The [http://www.armadeus.com/_downloads/apf9328/hardware/apf_schema.pdf APF schematic], page 10, shows the implementation of the chip with an EEPROM chip to store its parameters, including MAC address.

=== U-boot ===
[[BootLoader|U-boot]] has a parameter containing the Ethernet address. This parameter is independent from the hardware address. The parameter is '''ethaddr'''.
<pre class="apf">
BIOS> printenv ethaddr
00:1E:AC:XX:XX:XX
</pre>
XX:XX:XX being the board specific address.

== Change MAC address ==

It can happen that the MAC address is wrong (e.g.: 00:00:0E:00:00:00 in my case), empty or that you want to change it.

=== Empty MAC address ===
If the board MAC address is empty, the procedure is simplified.

In U-boot, simply set the correct value in the parameter '''ethaddr''', ping any address and save the environment.
<pre class="apf">
BIOS> setenv ethaddr 00:1e:ac:XX:XX:XX
BIOS> ping 1
MAC: 00:1e:ac:XX:XX:XX
operating at 100M full duplex mode
[Ctrl-C]
Abort
ping failed; host 1 is not alive
BIOS> saveenv
</pre>
FIXME: The above message are made-up, don't know if reprogramming message is displayed or not...
=== Wrong MAC address ===
If the MAC address is already set but wrong, changing the U-boot parameter ethaddr will not automatically reprogram the EEPROM. It is necessary to indicate to U-boot to reprogram the EEPROM.

This is made possible by a specific patch to U-boot by Armadeus for the DM9000 chip [http://armadeus.svn.sourceforge.net/viewvc/armadeus/trunk/buildroot/target/u-boot/u-boot-1.3.4-111-apf9328-DM9000.patch?revision=1009&view=markup] line 68 and following. Thanks to this patch, setting the ethaddr parameter to ff:ff:ff:ff:ff:ff and ping any IP will provoke the MAC address reprogramming. Then simply set ethaddr parameter again to the correct MAC address and ping any IP address, as shown below.
<pre class="apf">
BIOS> setenv ethaddr ff:ff:ff:ff:ff:ff
BIOS> ping 1
Warning: MAC addresses reprogramming..
MAC: ff:ff:ff:ff:ff:ff
operating at 100M full duplex mode
[Ctrl-C]
Abort
ping failed; host 1 is not alive
BIOS> setenv ethaddr 00:1e:ac:XX:XX:XX
BIOS> ping 1
Warning: MAC addresses reprogramming..
MAC: 00:1e:ac:XX:XX:XX
operating at 100M full duplex mode
[Ctrl-C]
Abort
ping failed; host 1 is not alive
BIOS>
</pre>

== Check your MAC address in Linux ==
Linux kernel and U-boot do not use the same source to get the board MAC address. As mentioned before, U-boot trusts its parameter ethaddr. Instead, Linux kernel, which uses the DM9000 driver, reads the MAC address from the EEPROM. During Linux boot, the driver prints the MAC address.
<pre class="apf">
[...]
dm9000 Ethernet Driver, V1.31
eth0: dm9000e at c1854000,c1856002 IRQ 110 MAC: 00:1e:ac:xx:xx:xx (eeprom)
[...]
</pre>

When logged on Linux, the tool '''ifconfig''' also displays information about the Ethernet MAC address.
<pre class="apf">
# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:1E:AC:XX:XX:XX
inet addr:192.168.0.10 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21e:acxx:xxxx:xx/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:468 (468.0 B)
Interrupt:110 Base address:0x4000
</pre>
The field HWaddr corresponds to the MAC address read by dm9000 driver and used during communication.