標籤：android usb kernel shell
背景
在 Linux-3.8 以後，Android 的核心分支，便去掉了 f_adb，改使用 USB function FS，在使用者空間實現 USB adb 功能。這篇文章根據原作者的 Google+ 文章，在 Atmel sama5 開發板上做了測試，將步驟記錄如下，供需要使用的讀者參考，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
編譯核心時使能 USB FunctionFS
When building your kernel, make sure to configure in FunctionFS:
Device Drivers -> USB Support -> USB Gadget Support
-> USB Gadget Driver -> Function Filesystem
設定正確的 USB vendor ID 和 Product ID
這個設定可以放在 bootcmd 或者載入核心模組的時候通過參數傳遞：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
啟動 Android 並掛載 functionFS， 使能 USB adbNow 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
重啟 adbd 守護進程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 <pid for adbd>
然後進入 cmd 或者 Linux Host 就可以成功串連 usb adb 獲得 Android shell 了On your host system, connect to the target using the adb program:
$ ./adb shell [email protected]:/#
Hooray there‘s your shell!
