Eth0 up/network issues

[Guru raj.M]

hi,

i am currently using BBB-Red board which as industrial grid..

with Debian GNU/Linux 7.8 (wheezy) os and made to boot from SDcard and image date is BeagleBoard.org Debian Image 2015-03-01.

 lsb_release -a

No LSB modules are available.

Distributor ID: Debian

Description:    Debian GNU/Linux 7.8 (wheezy)

Release:        7.8

Codename:       wheezy

i try to power up this bbb with my own carrier card with external power supply, it is (carrier card with external power supply) absolutely working with BBB-balck board and having same OS. if i connect this board to BBB-red board and powered on but eth0 doesn't came up, but in BBB-black board its working fine..

i tried with dmesg and i found below mesg... 

 dmesg | grep eth0

[    5.623106] net eth0: initializing cpsw version 1.12 (0)

[    5.628425] net eth0: phy found : id is : 0x7c0f1

[    5.633516] net eth0: phy 4a101000.mdio:03 not found on slave 1

[    5.665388] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

so there is no ethernet connection up. 

The carrier card with external power supply have 4 RS485 with serial digital isolator Si8422..

plz can any one tell what was the issues... even i thought of loading issues but its not.. 

[Yiling Cao]

looks like a hardware issue, could be:

• improper power sequence (maybe BBB-red powers up too early... I dunno what is bbb red)
• not enough power delivery/ or sudden power spike

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