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I'm trying to make a USB gadget, using the ConfigFS utilities. I'm following this clear guide and have successfully created a usb gadget with an interface. My problem is that I would like to implement another interface, different from the NCM that I just added, with a Vendor-Specific Class (bInterfaceClass 0xff) and a bInterfaceSubClass value of 0xf0. When i try to change the bInterfaceClass of the NCM interface I get the error bInterfaceClass: Permission denied, which seems reasonable since I've created a function of a predefined class (ncm). I would like to create a function where I can specify the bInterfaceClass Value, and also add two endpoints to it. Additionally, I have not been able to create a new interface with the desired descriptors.

For context, I'm using an iMX8QM board with Linux 6.1.36-imx8qm+gdd01990ad5ea. My goal is to connect an iPhone to the board using CarPlay, in fact the usb interface I need to add is the iAP2. Any advice or hint would be greatly appreciated.

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  • What exactly do you mean by "I get an error"? Hiding or paraphrasing error messages is rarely useful when asking for technical help on how to solve the error.
    – David Grayson
    Commented Dec 9, 2024 at 19:19
  • When I do echo 0xff > bInterfaceClass I get the error bInterfaceClass: Permission denied, which seems reasonable since I've created a function of a predefined class (ncm). I would like to create a function where I can specify the bInterfaceClass Value, and also add two endpoints to it.
    – Lorenzo Lucchina
    Commented Dec 10, 2024 at 9:32
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