netdev - Re: cpsw fails to come up once in a while

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Date:	Thu, 15 Aug 2013 15:29:27 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	<netdev@...r.kernel.org>
Subject: Re: cpsw fails to come up once in a while

On Wednesday 14 August 2013 11:24 PM, Sebastian Andrzej Siewior wrote:
> Hi,
>
> So I have this test where my am335x-evm boots over NFS and once it 
> completes it does it again. It works most of the time :) However once it
> like 100 attempts it does not. After the reset u-boot complains about
> ethernet timeout and linux has also no luck:
>
> | U-Boot 2013.04-00274-ga71d45d (May 27 2013 - 12:41:57)
> | 
> |…
> | Net:   Phy not found
> | PHY reset timed out
> | cpsw, usb_ether
> | Hit any key to stop autoboot:  1 ^H^H^H 0 
> | link up on port 0, speed 1000, full duplex
> | Using cpsw device
> | TFTP from server 172.123.10.10; our IP address is 172.123.10.3
> | Filename 'am335x/zImage'.
> | Load address: 0x80200000
> | Loading: *^H#################################################################
> |          #################################################################
> |          #######################################
> |          509.8 KiB/s
>
> So the PHY was not found but somehow it managed to fetch the kernel over
> network and boot it. The linux driver did not want to continue:
>
> | omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz
> | davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
> | davinci_mdio 4a101000.mdio: no live phy, scanning all
> | davinci_mdio: probe of 4a101000.mdio failed with error -5
> | Random MACID = 16:74:44:51:f1:0f
> | gpio-keys volume_keys.6: Unable to claim irq 0; error -22
> | gpio-keys: probe of volume_keys.6 failed with error -22
> | omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 03:22:52 UTC (946696972)
> | net eth0: initializing cpsw version 1.12 (0)
> | libphy: PHY 4a101000.mdio:00 not found
> | net eth0: phy 4a101000.mdio:00 not found on slave 0
> | libphy: PHY 4a101000.mdio:01 not found
> | net eth0: phy 4a101000.mdio:01 not found on slave 1
> | Waiting up to 110 more seconds for network.
>
> so the driver also failed to find a PHY and gave up.
> Is this something known?
>
> Sebastian
This is a unknown issue. Will arrange a setup to test this scenario and
fix the issue.

Regards
Mugunthan V N
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