socfpga/sockit ethernet problems

Dinh Nguyen dinh.linux at
Thu May 8 08:28:41 PDT 2014

On 05/07/2014 05:45 AM, Pavel Machek wrote:
> Hi!
> It seems we have some problems with Ethernet on socfpga boards.
> Like, "stmmac: Energy-Efficient Ethernet initialized" repeated way too
> often. Or machine failing to boot because NFS server can not be

There's a patch that already mainlined that fixes this:

83bf79b6bb stmmac: disable at run-time the EEE if not supported

> accessed. (And then working on next try). Or link going up and down
> and up and down. Or link taking 3 seconds, 10 seconds to estabilish.
> It also seems to be picky about hubs it wants to talk to.
> This time it mounted root; on last boot it just hung.
> Mounts root 31.394855 Waiting 5 sec before mounting root device...
> Mounts root 33.331379 stmmaceth ff702000.ethernet eth0: Link is Up -
> 100Mbps/Full - flow control rx/tx
> Mounts root 36.418308 VFS: Mounted root (nfs filesystem) on device
> 0:12.
> ### Milestone reached:  Mounts root
> Userland boots 51.455751 nfs: server not responding, still
> trying
> Userland boots 52.552075 nfs: server OK
> Userland boots 52.555110 devtmpfs: mounted
> Userland boots 52.566032 Freeing unused kernel memory: 264K (80597000
> - 805d9000)
> Userland boots 61.395175 nfs: server not responding, still
> trying
> Userland boots 61.401301 nfs: server OK
> U-boot seems to configure phy timing:
> u-boot talk 12.033741 Configuring PHY skew timing for Micrel ksz9021
> is there something similar that needs to be done at Linux layer.

I haven't tested in the sockit, but I have been testing on the devkit, 
and I am able to NFS mount just fine everytime.

I have a branch at:

git://  for-next

that you can test.

> Any ideas? Thanks,
> 									Pavel

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