NVETHERNET fails to load with custom Kernel on Orin Development Kit

[daniel.hopf]

Jetson Linux release: R35.2.1

A colleague has built a custom Kernel on an Orin Development Kit where he only enabled PCIe-PTM support (setting CONFIG_PCIE_PTM=y in the Kernel .config file).
For whatever reason, the onboard Ethernet (NVETHERNET) does not come up with this custom Kernel.

The steps he did:

1. copied the Original kernel config file from /proc/config.gz unzipped, copied on .config in the kernel_out folder.
2. make -C kernel/kernel-5.10/ arch=arm64 O=$PWD/kernel_out menuconfig (Enable PTM support and specify a custom string for the new Kernel)
3. make -C kernel/kernel-5.10/ arch=arm64 O=$PWD/kernel_out
4. make -C kernel/kernel-5.10/ arch=arm64 O=$PWD/kernel_out dtbs
5. make -C kernel/kernel-5.10/ arch=arm64 O=$PWD/kernel_out modules
6. sudo make -C kernel/kernel-5.10/ arch=arm64 O=$PWD/kernel_out modules_install
7. sudo cp kernel_out/arch/arm64/boot/Image /boot/Image-ptp-ptm
8. sudo vim /boot/extlinux/extlinux.conf
9. sudo reboot

He now gets errors in dmesg regarding nvethernet 6810000.ethernet like:
failed to read MDIO address
failed to read DMA
invalid resource
probe of 6810000.ethernet failed with error -22

Due to the onboard Ethernet not loading, there is also no PHC (/dev/ptp0) created.

I didn’t reproduce it on my Orin Development Kit, but I went a similar approach a while back and I had no issues with the onboard LAN coming up.

[DaneLLL]

Hi,
The latest production release is Jetpack 5.1.2. Would suggest try the version and see if the issue is still present.

[AakankshaS]

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