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Ethernet only working in Gigabit mode (not 100Mbit/s)

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I have a Gigabit ethernet card in my primary development computer. When I connect the Mini-ITX Zynq board directly to that (with static IPs on both), it works fine (testing with "ping <address>". However, if it connects through a 10/100Mbit/s switch, it fails to work. Similarly, another development computer with only a 10/100Mbit/s ethernet card directly connected does not work. This makes me conclude that ethernet in anything less than 1Gbit/s mode on the Mini-ITX does not work. I am using the stock standard microSD to boot up. I have also built up my own Linux kernel and image, which also has exactly the same issue.

I also have a Zedboard. With the stock standard SD to boot up, this does work in 100Mbit/s mode through the switch, and with the 100Mbit/s ethernet card in the development computer.

Is this a limitation of the hardware, or is it a software configuration thing (in the kernel?)? If it is configurable, how do I make it work in 100Mbit/s mode? I have never heard of a Gigabit ethernet device not working with lesser speeds before. It seems like quite a limitation that would affect a number of people!

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    Hello Sam,

     

    Sorry for the slow reply, it took a little while to assemble the equipment and duplicate the problem. You are correct the Out Of Box Linux only links correctly to a 1 Gig Ethernet link. The Mini-ITX hardware is fine, it is an issue with  PetaLinux 2013.10.

     

    I have verified that the Mini-ITX Ethernet link works correctly with PetaLinux 2014.2. We do have PetaLinux 2014.2 BSP files on the Mini-ITX 'Reference Designs/Tutorials' page: http://zedboard.org/support/design/2056/17

     

    You can follow the instructions in UG977 from Xilinx on how to create a new project. You could also just un-compress the BSP files and copy the boot.bin and uimage.ub files and replace those on your microSD card for a quick test.

     

    -Gary

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  • 0

    Hello Sam,

     

    Sorry for the slow reply, it took a little while to assemble the equipment and duplicate the problem. You are correct the Out Of Box Linux only links correctly to a 1 Gig Ethernet link. The Mini-ITX hardware is fine, it is an issue with  PetaLinux 2013.10.

     

    I have verified that the Mini-ITX Ethernet link works correctly with PetaLinux 2014.2. We do have PetaLinux 2014.2 BSP files on the Mini-ITX 'Reference Designs/Tutorials' page: http://zedboard.org/support/design/2056/17

     

    You can follow the instructions in UG977 from Xilinx on how to create a new project. You could also just un-compress the BSP files and copy the boot.bin and uimage.ub files and replace those on your microSD card for a quick test.

     

    -Gary

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