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boshkey
Observer
Observer
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Registered: ‎04-05-2016

PCIE devices can't be recognized by PC in the first time Power-On procedure

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Dear Fellows,

    With the virtex-7 FPGAs directly connected to the X86 host, host PC can not recognize the PCIE devices the first time power on procedure. Only when I restart the Windows OS, can the devices be recognized by Windriver software.

    (FPGA bit stream has been program into an on-board BPI flash)

    I have tried some relevant method. For example, delay the BIOS starting time, but still not success.
Could anyone give me some advice, any information could be helpful.

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coryb
Moderator
Moderator
1,171 Views
Registered: ‎02-11-2014

Hello @boshkey,

 

This sounds like you are not programming from flash fast enough the first time through. Please try changing the frequency of CCLK and see if that resolves the issue. UG570 should have more information on doing this. You could also try using EMCCLK instead of CCLK.

 

https://www.xilinx.com/support/documentation/user_guides/ug570-ultrascale-configuration.pdf

 

Thanks,

Cory

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coryb
Moderator
Moderator
1,172 Views
Registered: ‎02-11-2014

Hello @boshkey,

 

This sounds like you are not programming from flash fast enough the first time through. Please try changing the frequency of CCLK and see if that resolves the issue. UG570 should have more information on doing this. You could also try using EMCCLK instead of CCLK.

 

https://www.xilinx.com/support/documentation/user_guides/ug570-ultrascale-configuration.pdf

 

Thanks,

Cory

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boshkey
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Registered: ‎04-05-2016

Thank you for your advice. I'll try and post my result later.

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