usb camera 核心配置
1)通過make menuconfig選擇開啟配置選項
-> device drivers │
│ -> ********** support (media_support [=y]) │
│ -> video capture adapters (video_capture_drivers [=y]) │
│ -> v4l usb devices (v4l_usb_drivers [=y])
<*> usb video class (uvc)
[*] uvc input events device support
[*] usb philips cameras input events device support
開啟這些編譯選項之後儲存
2)直接make編譯得到帶有usb camera的uimage
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