If you need a fast and maintained linux-based firmware package for your webcam then here is the best place for you - https://github.com/showmewebcam/showmewebcam.

• linux-based firmware package
• fast boot
• uvc-gadget inside

If you want to build it yourself, then here is a place for you.

New documentation for uvc-gadget

Usage: ./uvc-gadget [options]

Available options are
    -b value       Blink X times on startup (b/w 1 and 20 with led0 or GPIO pin if defined)
    -f device      Framebuffer device
    -h             Print this help screen and exit
    -l             Use onboard led0 for streaming status indication
    -n value       Number of Video buffers (b/w 2 and 32)
    -p value       GPIO pin number for streaming status indication
    -r value       Framerate for framebuffer (b/w 1 and 30)
    -u device      UVC Video Output device
    -v device      V4L2 Video Capture device
    -x             show fps information

• host:
  make
• Cross compile:
  make ARCH=arch CROSS_COMPILE=cross_compiler
  eg:
  make ARCH=arm CROSS_COMPILE=arm-hisiv600-linux-
• or:
  set ARCH, CROSS_COMPILE, KERNEL_DIR in Makefile

• Apply patchset Bugfixes for UVC gadget test application

• Apply patchset UVC gadget test application enhancements

• Add Readme/.gitignore and documentations
  Copy linux-3.18.y/drivers/usb/gadget/function/uvc.h into repository, change include path for build

• Original uvc-gadget.git
• Fork(copy) uvc-gadget.git - wlhe
• Fork(copy) uvc-gadget.git - climberhunt / Dave Hunt
• Fork(copy) uvc-gadget.git - peterbay / Petr Vavrin

• better usb gadget configuration - maybe https://github.com/libusbgx/libusbgx
• better readme and wiki pages

• Raspberry Pi Zero with Pi Camera as USB Webcam / Dave Hunt
• TC35874 to UVC gadget application / Kin Wei Lee