15:46 <tnt> So, I'm having some trouble with PCIe.

15:47 <tnt> I can only see the device if I load the bitstream while the machine is already booted and I trigger a rescan ( echo 1 > /sys/bus/pci/rescan ). If I reboot it, I don't see it on the bus anymore.

15:48 <tnt> Also, even if detected, I get [ 1359.006710] litepcie 0000:01:00.0: Version \xff\xff\xff\xff\xff\xff... so something is obviously not working.

15:48 <tnt> This is also a bit worrying: [ 1293.572675] pci 0000:01:00.0: 16.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x8 link at 0000:00:01.0 (capable of 63.008 Gb/s with 8.0 GT/s PCIe x8 link)

15:51 <_florent_> tnt: I'm assuming you are using the analog devices board that you've been able to test succesfully a few months ago?

15:52 <_florent_> tnt: is there a difference in the setup/vivado version? of the only difference is LiteX/LitePCIe?

15:52 <tnt> yeah. But I've got one locally now, trying to run it on a different platform.

15:53 <_florent_> tnt: if the latter maybe try to use LitePCIe 2021.12: https://github.com/enjoy-digital/litepcie/releases/tag/2021.12

15:54 <_florent_> so the motherboard is different from the one you were previously using?

15:55 <tnt> yes.

15:57 <tnt> Rebuilding now with 2021.12 tag + local changes to use the other Quad.

15:58 <tnt> I'll try to recheck on the old setup tomorrow, but not sure it's going to be possible, I think the board was out-of-stock and they sent me the only one they had.

16:03 <_florent_> tnt: I currently have a ZCU106 in my office with PCIe that should be close I think to the configuration of your board, so I could also do a test.

16:04 <tnt> looks pretty close indeed.

16:04 <tnt> BTW theses things are mechanical nightmares ...

16:10 <_florent_> For now I only tested LitePCIe on the ZCU106 through a PCIe Riser (Gen3 X1). Doing more would requires a proper Gen3 X4 extender or indeed some weird mechanical setup...

16:12 <tnt> 16x might be easier to find.

16:12 <tnt> Oh no, nm, 4x is common.

16:29 <tnt> Just rechecked both 4x and 8x modes with 2021.12 tag and identical results.

16:30 <tnt> Gotta go now, but I'll check tonight if I can find anything.

16:31 <_florent_> ok

20:30 <tnt> mmm, no luck. Tried a bunch of bios options but always same behavior.