Old Android note: Android Source Tree based on CM9/Tenderloin source

如果不是Google了一下，我自己都不记得是多少年前我买了两个HP的TouchPad tablet,是2011年夏天,运行的是HP从Palm收购的WebOS（新主人是LG）。这是最短命的产品之一：On August 18, 2011, 49 days after the TouchPad was launched in the United States, HP announced that it would discontinue all current devices running webOS 。
感谢一些专业人士，提供了CyanogenMod安装（Tenderloin是CM为TouchPad定制的code name），从此可以在TouchPad上运行Android。CyanogenMod 9 (CM9) based on Android 4.0.4 have official stable builds with all features working。以下是我从source code dump出来的folder structure，并与前文Stackoverlow的描述进行了比较：

Several folders missing from prevous Statckoverflow website are highlight here. Folder that has qcom specific code is in blue font.

|-abi

|-android just two files: default.xml and README.mkdn

|-bionic

|-bootable

|-build

|-dalvik

|-development

|-device

| |-qcom =>msm8960, msm8660_surf, msm7627a, …, common

|-extrnal

|-frameworks

|-hardware

| |-msm7k

| |-qcom => display, gps, media; no alsa_sound and camera in Tenderloin source, but they are in our ICS

|-kernel

|-libcore mainly in Java

|-ndk

|-out

|-packages

|-prebuilt

|-sdk sdk and emulator

|-system

| |-core\rootdir\etc

| |-qcom =>softap

|-vendor manufactor custom code

|-qcom =>android-open, opensource, proprietary