Subject: phy link status not stable

From: Mugunthan V N <[email-masked]>
Date: Tue, 16 Sep 2014 21:56:56 +0530

Hi

While doing ifdown/ifup test, phy link up status is very much delayed
and also link up/down comes alternatively without physical link changes
which leads to ifup failure. in v3.12 internal tree there is no failure.
Pasting the logs below.

root@am437x-evm:~# ifup eth0
[  652.633204] net eth0: initializing cpsw version 1.15 (0)
[  652.717428] net eth0: phy found : id is : 0x221622
udhcpc (v1.20.2) started
Sending discover...
Sending discover...
[  658.717859] cpsw 4a100000.ethernet eth0: Link is Up - 1Gbps/Full -
flow control rx/tx
Sending discover...
[  660.717894] cpsw 4a100000.ethernet eth0: Link is Down
[  661.717937] cpsw 4a100000.ethernet eth0: Link is Up - 1Gbps/Full -
flow control rx/tx
No lease, failing
root@am437x-evm:~# udhcpc
udhcpc (v1.20.2) started
Sending discover...
Sending select for 172.24.190.6...
Lease of 172.24.190.6 obtained, lease time 3600
/etc/udhcpc.d/50default: Adding DNS 192.0.2.2
/etc/udhcpc.d/50default: Adding DNS 192.0.2.3
root@am437x-evm:~#

Is this a known issue or any pointers where to look for clues?

Setup: TI-AM437x EVM
Phy: Micrel KSZ9031 Gigabit PHY

Thanks,
Mugunthan V N