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 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:

?

1

insmod g_ffs.ko idVendor=0x18d1idProduct=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:

?

1

2

3

# 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.

?

1

2

3

    # ps adbd

    # kill <pid for=""adbd="">

</pid>

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:

?

1

2

$ ./adb shell

root@android:/#




转自：http://www.2cto.com/kf/201405/301253.html