[meta-xilinx] Ethernet PHY problems

[Nathan Rossi]

On Thu, Sep 10, 2015 at 6:19 PM, Alan Hughes
<alanhughes at e2eservices.co.uk> wrote:
> I am trying to build a BSP for a custom ZYNQ-7000 based board using Yocto
> 1.8 ("Fido") with the 3.19 Linux kernel based on the sources provided by
> Analogue Devices (2015.1 branch, see
> https://github.com/analogdevicesinc/linux/tree/2015_R1). The board has
> Marvell 88E1518 Gigabit PHY connected to one of theZYNQ's Ethernet
> controllers.
>
>
>
> We do not see any unexpected messages when we boot the board; all devices
> seem to start up correctly. However during the kernel boot the PHY's
> indicator lights start to flash, which I assume means that there is some
> problem, although the kernel does not generate any error messages (even when
> debug output is enabled). Logging in to the BSP and entering the command "ip
> link set dev eth0 up" does not generate any error messages in the
> application or the kernel, however the interface remains in a "down" state.
>
>
>
> We have confirmed that the PHY works by accessing it when in U-Boot; we've
> used DHCP to assign an address to the interface and ping'ed other devices on
> the local network. Also the PHY works with a test BSP provided by our board
> supplier; however the Linux kernel used by the supplier does not have the
> necessary device drivers available in it,
>
>
>
> I have attached  BSP boot log and our device tree; both have been compressed
> to save bandwidth.
>
>
>
> I would greatly appreciate any suggests as to what the problem might be, or
> alternately any ideas of approaches I can take to further diagnose the
> problem. I'm currently tearing my hair out on this one, which is a a bit of
> problem since I don't have a lot to tear out :-).

I dont see any issues in the device-tree and your boot log looks fine.

For further diagnosis setup debug output for the emacps driver, adding
"#define DEBUG" to the top of the file should be enough:
https://github.com/analogdevicesinc/linux/blob/2015_R1/drivers/net/ethernet/xilinx/xilinx_emacps.c

Also it is worth adding the program ethtool to your rootfs, this is
very useful for getting info about the link status and phy info of the
device.

Regards,
Nathan