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Last Post 07 Dec 2009 07:46 AM by  richard.laborde@logicpd.com
Ethernet
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ssancha



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09 Jun 2008 08:50 AM
    Hi

    I have been working for some months with an i.mx27ads board. I have a linux kernel, root filesystem and some applications working. We just purchased a i.mx27 litekit board and I have been trying to port our work to it, but I am facing some problems: when I attach an Ethernet cable to the board no connection is detected, no led lights, and I cannot ping from the PC to the it or viceversa (even though I can configure the ip address, mask, etc. of the target).

    Do I have to do anything to enable/setup the ethernet connection on the board? Am I missing something?

    Thanks in advance

    norbertg



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    10 Jun 2008 02:20 AM
    hi

    try to use some sniffer i.e. wireshark to check does the board sends packets

    Norbert

    richard.laborde@logicpd.com



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    Posts:247
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    11 Jun 2008 07:28 AM
    The newest version of LogicLoader for the i.MX27 is now available to registered customers. I would recommend everyone update their LoLo. I believe this has fixed ssancha's problem.

    Thanks

    Richard

    andyf



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    02 Jul 2008 02:11 PM
    I'm having the same issue. Updated to v2.4.1 LoLo but no sign of life on the Ethernet.

    Any ideas?

    proseman



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    09 Jul 2008 11:34 PM
    Please see following instructions. It works fine for me.

    [*]Update Lolo to 2.4.1 version
    [*]Run "config CREATE"
    [*]reconfigure your MAC address

    How configure MAC address, According Logicpd support, Jackson
    The MAC address can be updated on your SOM-LV.
    1) Find the MAC address on your SOM
    (white sticker with 6 number bytes)
    2) Start Lolo on your LITEKIT.
    3) Initialize the Config block with the command:
    losh> config CREATE <RETURN>
    4) enter the MAC value into your FLASH
    (losh> help ifmac <RETURN> for information)
    examples:
    losh> ifmac sm0 <RETURN> <-- to display current MAC address ifmac sm0
    losh> 0x01:0x01a:0xee:0x??:0x??:0x?? <RETURN> <--example
    (replace your MAC address over the example numbers above)
    5) Confirm update:
    losh> ifmac sm0 <RETURN>
    6) Save the current Ethernet settings with the command:
    losh> config E 0 <RETURN>
    The zero "0" above maps, as an index, to the "0" in the sm0
    7) You will have to reboot your LITEKIT after this.


    Best regards
    proseman

    zyzyis@gmail.com



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    04 Aug 2008 05:23 AM
    I have met the exact problem as yours and following the above instructions does not solve my problem. Help!! LogicPD guys.

    gabriel.neagoe@gmail.com



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    20 Aug 2008 05:29 PM
    I have a similar problem with the ethernet port (not running). The board is running LogicLoader 2.4.1-IMX27_10 0001.
    I've updated the mac using the ifmac (as per the instructions above) and saved configuration to flash.

    When I try ifconfig dhcp, I get the following error followed by "No empty FEC TX DMA buffers" message

    losh> ifconfig sm0 dhcp
    Starting DHCP on sm0 ..
    error: ifconfig: unable to get ip address; still trying (sm0)
    No empty FEC TX DMA buffers
    No empty FEC TX DMA buffers

    and the IP is not renewed.

    Network cable is connected to the board, but there is no indication in the router that the port is connected.

    If I assign a static IP by using ifconfig,
    losh> ifconfig sm0 192.168.1.63 255.255.255.0 192.168.1.254

    the IP is saved and reported back when I issue a ifconfig sm0,

    sm0: up 100M full-duplex promisc (5e5)
    sm0: mac: 00:0x:xx:xx:xx:xx ip: 192.168.1.63
    mask: 255.255.255.0 gw: 192.168.1.254

    When I ping the gateway the dreaded "No empty FEC TX DMA buffers" is back

    losh> ping 192.168.1.254 10
    Pinging 192.168.1.254 10 times from 192.168.1.63
    No empty FEC TX DMA buffers
    No empty FEC TX DMA buffers

    Any thoughts on this ? Should I request a RMA for the board, or is there a software fix ?

    zyzyis@gmail.com



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    21 Aug 2008 03:17 AM
    Yes, you need a RMA.

    richard.laborde@logicpd.com



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    Posts:247
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    07 Dec 2009 07:46 AM
    This issue was caused by a boundary condition on the internal regulator power up. It works on about 90% of the i.MX27 beta boards. If you have a registered kit please use the Ask a question system to get a set of rework instructions that will make sure the ethernet is powered properly every time.

    Thanks
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