Hello,
We observe that on Yocto hardknott (which is the official version for the Adlink IMX8), PCIe doesn't work.
After some investigation we found out they add proper detection on kernel > 5.4.0 of the platform which makes the IMX8/PCIe not recognized hence not functional anymore.
Is this soemthing you have observed on your side as well and do you have a solution for it?
Thanks,
Manuel
We tested it on our end and it was ok. If you have any error message or log please share it with us.
Hello,
Here is some feedback:
# Hardknott -> based on kernel 5.10
~/Downloads/adlink/hardknott/unzip ../LEC-IMX8MP-2G-IPi-SMARC-PLUS_Hardknott_1v7_20210826.zip
~/Downloads/adlink/hardknott$ sudo dd if=H_2G_imx-image-multimedia-lec-imx8mp-20210806094451.rootfs.wic of=/dev/mmcblk0 oflag=sync status=progress bs=4MiB
# Testing PCIe
sh-5.1# lspci => NO OUTPUT
Here is an extract from dmesg,
[...]
[ 0.174340] imx8-pcie-phy 32f00000.pcie-phy: failed to get imx pcie phy clock
[...]
Zeus -> based on kernel 5.4
~/Downloads/adlink/zeus/unzip ../../LEC-IMX8MP-2G-IPi-SMARC-PLUS_Yocto-zeus_1v6_20210712.zip
~/Downloads/adlink/hardknott$ sudo dd if=LEC-IMX8MP-2G-IPi-SMARC-PLUS_Yocto-zues_v1.6_20210712 of=/dev/mmcblk0 oflag=sync status=progress bs=4MiB
## Testing PCIe
sh-5.0# lspci
00:00.0 PCI bridge: Synopsys, Inc. DWC_usb3 (rev 01)
01:00.0 PCI bridge: Pericom Semiconductor Device b304 (rev 01)
02:01.0 PCI bridge: Pericom Semiconductor Device b304 (rev 01)
02:02.0 PCI bridge: Pericom Semiconductor Device b304 (rev 01)
Here is an extract from dmesg
[...]
[ 2.588891] imx6q-pcie 33800000.pcie: 33800000.pcie supply epdev_on not found, using dummy regulator
[ 2.607170] imx6q-pcie 33800000.pcie: PLL REF_CLK is used!.
[ 2.613394] imx6q-pcie 33800000.pcie: PCIe PHY PLL clock is locked.
[...]
Conclusion
There seems to be a regression related to a kernel update where imx8mp was wrongly detected as an imx6q although dts seems to match imx8mp PCIe pin mapping.
Looking on Internet I found a similar issue with the I.MX8MM that you can find
here, and NXP advice to modify the dts file. There is also this
link, which is a set of linux patches titled 'Add the iMX8MP PCIe support'.
Your feedback is welcome.
HELLO,
Is the problem solved please?
Currently having the same problem.
do you have a solution for it?
thx
