I'm trying to configure an Android kernel to support connecting the phone as a USB gadget using the CDC ACM protocol. I'm making progress in understanding how to configure the kernel for this, but it seems something new pops up every day. One thing I don't understand about the Android Gadget configuration is the difference between CONFIG_USB_ANDROID_ACM and CONFIG_USB_ANDROID_SERIAL. Can anyone explain the difference? I see that ANDROID_ACM compiles f_acm.c and u_serial.c, while ANDROID_SERIAL compiles serial.c and u_serial.c. (All of these files are in drivers/usb/gadget.) But I don't understand the difference. The comments in f_acm.c and serial.c both mention CDC- ACM. Does anyone have any guidance on these two options?
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