The question about mac address in eeprom

arknights · March 10, 2020, 3:00pm

Hi,

1.Is the nano module eeprom information in the i2c bus2 0x50?

2.I use i2ctool dump bus2 0x50, then I find the output about eth mac addr is different with it in ifconfig.
The following is outputs:

sudo i2cdump -f -y 2 0x50
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 01 00 fc 00 78 0d 00 00 02 46 00 00 00 00 00 00    ?.?.x?..?F......
10: 00 00 00 00 36 39 39 2d 31 33 34 34 38 2d 30 30    ....699-13448-00
20: 30 30 2d 32 30 30 20 46 2e 30 00 00 00 00 00 00    00-200 F.0......
30: 00 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
40: ff ff ff ff 74 3a e4 4b 04 00 30 34 32 31 35 31    ....t:?K?.042151
50: 39 30 31 35 35 37 37 00 00 00 00 00 00 00 00 00    9015577.........
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
90: 00 00 00 00 00 00 4e 56 43 42 1c 00 4d 31 00 00    ......NVCB?.M1..
a0: ff ff ff ff ff ff ff ff ff ff ff ff 74 3a e4 4b    ............t:?K
b0: 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ?...............
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a2    ...............?

ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.19  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::b3cb:e9e6:cc4a:c7be  prefixlen 64  scopeid 0x20<link>
        ether 00:e0:4c:68:01:c3  txqueuelen 1000  (Ethernet)
        RX packets 5515  bytes 7858310 (7.8 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3814  bytes 303226 (303.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 151  base 0x8000

Before I get the right output with TX2(bus7 0x50), but now it seems have some questions with nano(bus2 0x50).
I want to see and assign mac addr about nano, please help me.
Thanks.

arknights · May 6, 2020, 6:02pm

From the outout with “sudo i2cdump -f -y 2 0x50”, eth mac addr is: 04:4b:e4:3a:74
But the device eth mac addr is: 00:e0:4c:68:01:c3
We want to know why they are different and how to make they keep the same.

WayneWWW · March 10, 2020, 3:00pm

That is indeed weird. Could you share the boot log (bootloader log) from uart?

arknights · March 10, 2020, 3:00pm

Sure, and I change another nano, get the same result.
Serial-COM13_1217_15-21-41.log (31.6 KB)

arknights · May 6, 2020, 6:02pm

Sorry, #4’s log is for the another nano, not for #1 and #2.
The following is mac information for #4’s nano:
From the outout with “sudo i2cdump -f -y 2 0x50”, eth mac addr is: 00:04:4b:e4:3f:8d
But the device eth mac addr is: 00:e0:4c:68:01:e5

WayneWWW · March 10, 2020, 3:00pm

Hi arkinghts,

Is it a production module?

arknights · March 10, 2020, 3:00pm

Hi WayneWWW,

No, it is:
Jetson Nano: P3450-0000(development module with SD Card memory)

WayneWWW · May 6, 2020, 6:02pm

Hi arknights,

Could you share the release you are using? I suspect there are some udev rules override the mac.

Please share the result of “sudo udevadm info -q all /sys/class/net/eth0”.

arknights · March 10, 2020, 3:00pm

Hi WayneWWW,

I used Jetpack 4.2.1 rev.2. Another device used Jetpack 4.2.3

$ sudo udevadm info -q all /sys/class/net/eth0
P: /devices/1003000.pcie/pci0000:00/0000:00:02.0/0000:01:00.0/net/eth0
E: DEVPATH=/devices/1003000.pcie/pci0000:00/0000:00:02.0/0000:01:00.0/net/eth0
E: ID_BUS=pci
E: ID_MM_CANDIDATE=1
E: ID_MODEL_FROM_DATABASE=RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
E: ID_MODEL_ID=0x8168
E: ID_NET_DRIVER=r8168
E: ID_NET_LINK_FILE=/lib/systemd/network/99-default.link
E: ID_NET_NAME_MAC=enx00e04c6801c3
E: ID_NET_NAME_PATH=enp1s0
E: ID_OUI_FROM_DATABASE=REALTEK SEMICONDUCTOR CORP.
E: ID_PATH=platform-1003000.pcie-pci-0000:01:00.0
E: ID_PATH_TAG=platform-1003000_pcie-pci-0000_01_00_0
E: ID_PCI_CLASS_FROM_DATABASE=Network controller
E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
E: ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Co., Ltd.
E: ID_VENDOR_ID=0x10ec
E: IFINDEX=3
E: INTERFACE=eth0
E: SUBSYSTEM=net
E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/eth0
E: TAGS=:systemd:
E: USEC_INITIALIZED=4295962
E: net.ifnames=0

WayneWWW · March 10, 2020, 3:00pm

I don’t see any udev which is involved with mac address.

Is this mac address the same value in each reboot?

arknights · May 6, 2020, 6:03pm

yes, no matter each reboot or reflash, mac address has the same value.

First nano:
From the outout with “sudo i2cdump -f -y 2 0x50”, eth mac addr is: 00:04:4b:e4:3a:74
But the device eth mac addr is: 00:e0:4c:68:01:c3

Second nano:
From the outout with “sudo i2cdump -f -y 2 0x50”, eth mac addr is: 00:04:4b:e4:3f:8d
But the device eth mac addr is: 00:e0:4c:68:01:e5

WayneWWW · March 10, 2020, 3:00pm

Since this is A02, could you confirm

You are using devkit, right?
Please dump below node and I think it should match your value in eeprom

root@nvidia-desktop:/proc/device-tree/chosen# xxd nvidia,ethernet-mac

Please fallback to the oldest jetpack release (jetpack4.2) or sdcard image to clarify if the cause is in different software release.

arknights · May 6, 2020, 6:03pm

Yes, and I see it writes A02 backside again.
yes, “/proc/device-tree/chosen/nvidia,ethernet-mac” shows the same mac address as the mac address value in eeprom, not the device eth mac address.
Later I will try and reply the result.

arknights · March 10, 2020, 3:00pm

I find the oldest jetpack release on SDK Manager for Nano(P3448-0020) is Jetpack 4.2.1(rev.2).
It is what I used.
Later I will download jetpack4.2 sdcard image to test.

WayneWWW · March 10, 2020, 3:01pm

Hi arknights,

This old issue comes to my mind. I think it is duplicated with your problem.

https://devtalk.nvidia.com/default/topic/1056705/jetson-nano/jetson-nano-developer-kit-ethernet-firmware-update/

arknights · March 10, 2020, 3:01pm

Hi WayneWWW，

My board’s Serial Number is xxx1519xxxxxx.
Is there a jetpack version requirement for this firmware update?
I will try it with jetpack 4.2.3 and reply the result.

Thanks.

arknights · March 10, 2020, 3:01pm

Hi WayneWWW，

Yes, after firmware update, the mac address value is right!
the mac address value from ifconfig is the same as it in eeprom!

Thanks.