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Adventurer
Adventurer
4,807 Views
Registered: ‎11-27-2010

eth0: unable to generate target frequency: 25000000 Hz

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Hi,

     1. landed into this "unable to targer frequency" error.

     2. looked at earlier posts and confirmed that clk is NOT drawn from EMIO pins [plz check picture attached].

     3. for some reason, i cannot dump this [in other words, this file [clk_summary] is not present].

 

cat /sys/kernel/debug/clk/clk_summary

      4. logs for the error is in this post

      5. board dont get ip when i do udhcpc

      6. GEM3 interface pins configuration attached with this post.

      7. please let me know if you need anything more.

      8. please help to solve this issue.

 

==================================================================================

root@DNA_fmc:~# udhcpc
udhcpc (v1.24.1) started
Sending discover...
Sending discover...
Sending discover...
[ 49.224908] macb ff0e0000.ethernet eth0: link down
[ 50.228946] macb ff0e0000.ethernet eth0: unable to generate target frequency: 25000000 Hz
[ 50.237056] macb ff0e0000.ethernet eth0: link up (100/Full)
Sending discover...
Sending discover...
Sending discover...
Sending discover...
Sending discover...
Sending discover...
Sending discover...
Sending discover...
Sending discover...

 

==================================================================================

 

gem3_clk_config.jpg
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Adventurer
Adventurer
5,720 Views
Registered: ‎11-27-2010

Re: eth0: unable to generate target frequency: 25000000 Hz

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Hi, 

    i solved this. i acidentally connected to 100M switch and for 100M it requires 25MHz frequency.

 

now i connected to 1000M [1G] switch and the auto negotiation went with 125MHz frequency, i get the ip now.

 

Thanks

3 Replies
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Adventurer
Adventurer
5,721 Views
Registered: ‎11-27-2010

Re: eth0: unable to generate target frequency: 25000000 Hz

Jump to solution

Hi, 

    i solved this. i acidentally connected to 100M switch and for 100M it requires 25MHz frequency.

 

now i connected to 1000M [1G] switch and the auto negotiation went with 125MHz frequency, i get the ip now.

 

Thanks

Observer trilok_4
Observer
2,559 Views
Registered: ‎05-30-2016

Re: eth0: unable to generate target frequency: 25000000 Hz

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Hi ,

 

I have similar issue, please can you help me out. I'm using Zybo board and Vivado 2016.3. I tried enabling auto-negation and fixing 1G speed in Host machine, but none of the combination worked.  Hoping for response

 

Thanks/Regards

Trilok

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Moderator
Moderator
2,547 Views
Registered: ‎09-12-2007

Re: eth0: unable to generate target frequency: 25000000 Hz

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Can you make sure that the ethernet clock is set to 25Mhz in the Vivado project in the Zynq PS config GUI

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