[meta-xilinx] Ethernet PHY problems

[Alan Hughes]

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 :-).

 
Thanks in advance

 
Alan Hughes

 

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