Using Chipscope ILA causes Linux to crash on Zynq Ultrascale+ MPSoC

[nreddy@aeye.ai]

Hi All,

We are using the Zynq Ultrascale+ MPSoC; running baremetal we have no problems using Chipscope ILA connected via either Platform USB cable or the SmartLynq cable.

However when we boot linux (out of SDCard) and then run chipscope ILA (connected via either the Platform USB cable or the SmartLynq calbe), it more often than not crashes Linux.

We have already tried this suggest fix but to no avail : https://www.xilinx.com/support/answers/69143.html

If any one has any suggestions or workarounds, would love to hear them.

Thanks

[gudishak · Accepted solution]

Hi nreddy@aeye.ai 

Could you please share the Linux boot log to check the power management? also check boot args whether your changes reflected or not.

You can try with v2018.3 release where this issue is fixed. 

[stephenm]

Could it be the cpu idling?

https://www.xilinx.com/support/answers/69143.html

[nreddy@aeye.ai]

Hi Kranthi,

I forgot to mention that we are using 2018.3. 

I will try and get the linux boot log for you.

Thanks

[nreddy@aeye.ai]

Please check my original post; we have already tried the work around that you have linked and it did not improve or help the situation.

[gudishak]

Hi nreddy@aeye.ai 

Could you please give a try by disabling the CPU idle in Kernel?

Petalinux-config -c kernel

CPU Power Management --->
  -> CPU Idle --->
        [ ] CPU idle PM support

Then try building and boot the board.

[stephenm]

Can you post the linux log. Does it halt at the same spot, or random?

[nreddy@aeye.ai]

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@gudishak wrote:

Hi nreddy@aeye.ai 

Could you please share the Linux boot log to check the power management? also check boot args whether your changes reflected or not.

You can try with v2018.3 release where this issue is fixed. 

---

Thanks for the tip regarding checking the boot args. It looks like that helped and we had one successful case of running chipscope with Linux booted.