[MinnowBoard] MinnowBoard MAX 0.93 64-Bit & network lost

David Scully dscully at sbimagingsystems.com
Fri Sep 9 17:39:09 UTC 2016


"Either happens only 1 out of every n (n possibly being variable as well)
runs, or happens in a wildly variable time frame (takes as little as 2
seconds and as long as 12 hours) to failure, regardless of environmental

That's consistent with what I'm seeing. Sometimes its near immediately,
other times I have to run it for ~30 minutes.

"But also note #1, enabling the PCIe port 1, could this contribute to PCIe
disconnects in the custom hardware?"

Even on 0.92 firmware, I enable this port because our board uses it for the
main Ethernet NIC.


I tested 0.92 firmware with Spread Spectrum On and was unable to lose PCIe
connection on the i211 on Port 1 (Port 2 in the FW).

I was hoping to test 0.93 firmware where spread spectrum is off but the
option appears to have vanished. I'm wondering if there were more changes in
that two month window to the PCIe system that might have motivated turning
it on permanently in 0.93. There aren't many commits to bisect on the edk2
minnowboard-max-udk2015 branch, but I have no idea how much the binary
objects have changed.

I might try to build a version that reverts this commit, so I'm able to
disable spread spectrum on 0.93 firmware:

Our board leaves PCIe 0 disconnected while 1, 2, and 3 are connected to
separate i211 NICs. I did discover today that it appears that on 0.93 I'm
not seeing any PCIe disconnects on port 2 (Port 3 in FW). It looks like it's
pointing to some potential signal integrity issues on our board that are
exacerbated by the PCI change in the firmware.

This might not be important, but one thing I noticed in the setup screen is
that it doesn't show a IFWI Version or BIOS Version on my board, while it
does appear on a Minnowboard Max. Our BOM_OP[X] pins (for HW ID) are
strapped to mimic the Turbot X205.

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