Forum Discussion
ContributorExample design: Agilex I-series devkit not detected by lspci (stuck in S_CFG_LINKWD_START)
I found the issue.
The default position for the SW3 is defined in the UG as OFF/ON/ON/OFF, to use the refclk from the connector.
The board was received with OFF/OFF/OFF/OFF, to use the on-board refclk.
I set the SW3 as documented and it's now enumerated by the bios and seen in lspci.
Why it doesn't work using the on-board refclks?
Devkit: DK-DEV-AGI027RES
Serial number: AGIPCIE8000248
Regards,
ContributorI found the issue.
The default position for the SW3 is defined in the UG as OFF/ON/ON/OFF, to use the refclk from the connector.
The board was received with OFF/OFF/OFF/OFF, to use the on-board refclk.
I set the SW3 as documented and it's now enumerated by the bios and seen in lspci.
Why it doesn't work using the on-board refclks?
Devkit: DK-DEV-AGI027RES
Serial number: AGIPCIE8000248
Regards,
Regular ContributorHi,
Glad that you solve the issue, thanks for sharing with me as well
Seen that the problem happens on the refclks settings if follow Error Code 18948
https://www.intel.com/content/www/us/en/support/programmable/articles/000086828.html
With that, I am setting this case to close status at this time.
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Regards,
Wincent_C_Intel
- alexislms
Before closing the issue, I would like to understand why it doesn't work setting the on-board refclk in SW3.
There is something wrong somewhere, I don't get the Error Code 18948 with the example design since the board is successfully programmed and I can use SignalTap to see the internal signals (cf. the screenshot in the question). However, the board wasn't enumerated.
Is that a hardware issue of the devkit?
- Wincent_Altera
Hi,
No worries, I will remain this case open.
As my understand from your previous reply, you mention that
"the device is enumerated after you set the SW3 as documented, and seen in lscpci. "
As per mention, my understanding is it works as usual already, can I know why suddenly it cannot be enumerate?
Can you clarify more?
Regards,
Wincent_C_Intel
- alexislms
I'm just curious of the reason since it is supposed to work out of the box with both switch positions.
Using the same sof file, SW3[3] (PCIe refclk selection) set to:
OFF=On-board refclk Not working (hence my question); Programming OK but enumeration not working ON=CLK from PCIe Connector Working Why using the on-board refclk doesn't work? Is it a hardware issue? Maybe the clocks aren't populated in the PCB for this ES devkit?
Regards,
