adamfeuer commented on issue #15880:
URL: https://github.com/apache/nuttx/issues/15880#issuecomment-2675903842

   @tao-at-pricer @acassis Hey there. I am still on NuttX 11.x for my SAMA5 
app, TCP/IP over CDC/ECM works there. I will install 12.x and see if anything 
has changed.
   
   I've never used CDC/ECM on a non-SAMA5 device, but I do have an 
STMF4-Discovery, so will try that out and see if I can get it to work, and 
report back.
   
   Some questions. How are you looking to see if the CDCECM device is being 
recognized on the Linux side? The NuttX system will appear as a new ethernet 
interface. You should be able to see it using `ifconfig`.
   
   In the meantime. I know this config works on the SAMA5 on 11.x:
   
   
https://github.com/apache/nuttx/blob/master/boards/arm/sama5/jupiter-nano/configs/sdmmc-nsh-net-resolvconf/defconfig
   
   And you may have looked here, but this is the Kconfig file (used by the 
menuconfig system that configures NuttX) for CDCECM:
   
   
https://github.com/apache/nuttx/blob/fd6d80462303fc363d885150e49f9c5f175639c5/drivers/usbdev/Kconfig#L1251


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