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Android 4.4 Kitkat 使能 USB adb 功能

背景在 Linux-3.8 以后,Android 的内核分支,便去掉了 f_adb,改使用 USB function FS,在用户空间实现 USB adb 功能。这篇文章根据原作者的 G...

背景


在 Linux-3.8 以后,Android 的内核分支,便去掉了 f_adb,改使用 USB function FS,在用户空间实现 USB adb 功能。这篇文章根据原作者的 Google+ 文章,在 Atmel sama5 开发板上做了测试,将步骤记录如下,供需要使用的读者参考,你也可以查看作者原文:https://plus.google.com/111524780435806926688/posts/AaEccFjKNHE

在 Linux-3.10 上使能 USB ADB


编译内核时使能 USB FunctionFS


When building your kernel, make sure to configure in FunctionFS:
Device Drivers -> USB Support -> USB Gadget Support
-> USB Gadget Driver -> Function Filesystem

设置正确的 USB vendor ID 和 Product ID


这个设置可以放在 bootcmd 或者加载内核模块的时候通过参数传递: Modify your boot parameters to set the vendor and product ids so adb on your host recognizes the device.
g_ffs.idVendor=0x18d1 g_ffs.idProduct=0x4e26

Alternatively this can also be done if you built the gadget driver as a module at load time:
    insmod g_ffs.ko idVendor=0x18d1 idProduct=0x4e26




启动 Android 并挂载 functionFS, 使能 USB adb

Now here I'm assuming you've got a serial port working. Boot your target device with your new kernel (and insmod the g_ffs driver if necessary), and setup the functionfs directory:
    # mkdir /dev/usb-ffs
    # mkdir /dev/usb-ffs/adb
    # mount -o uid=2000,gid=2000 -t functionfs adb /dev/usb-ffs/adb



重启 adbd 守护进程

If everything is working, you can kill adbd and when it restarts it should find the functionfs mount and make use of it.
    # ps adbd
    # kill 



然后进入 cmd 或者 Linux Host 就可以成功连接 usb adb 获得 Android shell 了

On your host system, connect to the target using the adb program:
    $ ./adb shell
    root@android:/#


Hooray there's your shell!