Hello
Basic info:
Custom Carrier board
L4T R28.2.1
Cfg#5
PEX0 lanes (x2) are connected to a onboard pcie switch.
PEX2 lane (x1) is connected to mini card connector.
Both the lanes PEX0 and PEX2 disappear when i connect a mPCIe card on the PEX2 lane but when nothing is connected on PEX2, PEX0 is working.
What could be the issue?
vish_nm,
Please share the dmesg with us. Also, the tx2 adaptation guide and this link may help.
https://elinux.org/Jetson/TX2_USB
Hello WayneWWW
I have attached the dmesg txt file.
I have noticed the Plugin Manager has overwritten the device tree. So i checked the lanes using devmem2.
The results are okay for cfg#5
dmesg.txt (65.5 KB)
vish_nm,
“The results are okay for cfg#5” → Have you resolved the problem?
According to log, it looks the problem is still.
WayneWWW
Let me clarify. I meant the output of devmem2 are correct. The lanes are owned by the respective controller as per cfg#5.
The problem still persists.
Could you make out what the reason is from the log?
vish_nm,
According to your log, plugin-manager in dts still overwrites your dtb. So the config is still 4x1,1x1.
Please comment out that 3 fragments mentioned in below page.
WayneWWW
Yes i just did that,The plugin manager is not over writting the DT anymore and PEX0 is back but PEX2 and PEX1 are not working.PEX1 had no issues previously.
I am suspecting USB Lane Mapping. How can i verify?
I have attached the DT file for reference.
DT.txt (4.59 KB)
vish_nm,
If you configuration in dts is correct, the dmesg should show you have pcie 2,1,1.
Did the dmesg you shared already comment out plugin-manager fragment?
WayneWWW
No the dmesg i shared earlier didn’t have the plugin-manager fragment commented. I did that now and updated in the last comment.
I can see pcie 2.1.1 configuration but PEX1 and PEX2 are non functional.
The dmesg attached now has the plugin-manager fragment commented.
dmesg.txt (71.9 KB)