How to get USB0 Ethernet STM32MP157f-dk2 with buildroot

Question

Hi, the image provided by ST, usb0 ethernet show up as well when try 'ifconfig'.

We would like to try with buildroot.

We pick kernel from ST: linux-5.15-stm32mp-r1.tar.gz

We pick config from ST: en.SOURCES-stm32mp1-openstlinux-5.15-yocto-kirkstone-mp1-v22.06.15.tar.xz (inside the zip has config-5.15.24.txt file)

Building and boot are success.

We expected to see "usb_gadget" in folder /sys/kernel/config to run "stm32_usbotg_eth_config.sh". But "usb_gadget" folder doesn't appear.

But we tried:

```

mkdir -p /config

mount -t configfs none /config

```

"usb_gadget" does appear inside /config as well.

So, we change path in script "stm32_usbotg_eth_config.sh", instead of "/sys/kernel/config/usb_gadget" become "/config/usb_gadget".

Script run look fine but all we see just:

[ 45.084215] using random self ethernet address

[ 45.087218] using random host ethernet address

Anyone know what we are missing or any hint?

And why "usb_gadget" only appears when use mount, instead of default "/sys/kernel/config/usb_gadget"?

Many thanks

Note: libcomposite is builtin module but for sure we also tried cmd:

```

modprobe libcomposite

```

OlivierK · Answer

Hi Dat Tran (Community Member)

Sorry this post is quite old. Did you manage to find a solution to this issue? or maybe in Bootlin community?

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