编译Android系统

官方网址：

http://source.android.com/source/building.html

下面摘录相关内容：

Downloading and Building

The Android build is routinely tested in-house on recent versions of Ubuntu LTS (12.04), but most distributions should have the required build tools available. We welcome reports of successes or failures on other distributions.

Before you download and build the Android source, ensure your system meets the following requirements:

• A Linux or Mac system. It is also possible to build Android in a virtual machine on unsupported systems such as Windows. If you are running Linux in a virtual machine, you need at least 16GB of RAM/swap and 50GB or more of disk space in order to build the Android tree. See disk size requirements below.
• A 64-bit environment is required for Gingerbread (2.3.x) and newer versions, including the master branch. You can compile older versions on 32-bit systems.
• At least 50GB of free disk space for a checkout, 100GB for a single build, and 150GB or more for multiple builds. If you employ ccache, you will need even more space.
• Python 2.6 -- 2.7, which you can download from python.org.
• GNU Make 3.81 -- 3.82, which you can download from gnu.org,
• JDK 7 to build the master branch of Android in the Android Open Source Project (AOSP); JDK 6 to build Gingerbread through KitKat; JDK 5 for Cupcake through Froyo. See Initializing a Build Environment for installation instructions by operating system.
• Git 1.7 or newer. You can find it at git-scm.com.

Initializing a Build Environment

In this document

1. Choosing a Branch
2. Setting up a Linux build environment
1. Installing the JDK
2. Installing required packages (Ubuntu 12.04)
3. Installing required packages (Ubuntu 14.04)
4. Installing required packages (Ubuntu 10.04 -- 11.10)
5. Configuring USB Access
6. Setting up ccache
7. Using a separate output directory
3. Setting up a Mac OS build environment
1. Creating a case-sensitive disk image
2. Installing the JDK
3. Master branch
4. Branch 5.0.x and earlier branches
5. Branch 4.4.x and earlier branches
6. Branch 4.0.x and all earlier branches
4. Next: Download the source

This section describes how to set up your local work environment to build the Android source files. You will need to use Linux or Mac OS. Building under Windows is not currently supported.

For an overview of the entire code-review and code-update process, see Life of a Patch.

Choosing a Branch

---

Some of the requirements for your build environment are determined by which version of the source code you plan to compile. See Build Numbers for a full listing of branches you may choose from. You may also choose to download and build the latest source code (called "master"), in which case you will simply omit the branch specification when you initialize the repository.

Once you have selected a branch, follow the appropriate instructions below to set up your build environment.

Setting up a Linux build environment

---

These instructions apply to all branches, including master.

The Android build is routinely tested in house on recent versions of Ubuntu LTS (12.04), but most distributions should have the required build tools available. Reports of successes or failures on other distributions are welcome.

For Gingerbread (2.3.x) and newer versions, including the master branch, a 64-bit environment is required. Older versions can be compiled on 32-bit systems.

Note: See the Downloading and Building page for the list of hardware and software requirements. Then follow the detailed instructions for Ubuntu and Mac OS below.

Installing the JDK

The master branch of Android in the Android Open Source Project (AOSP) requires Java 7. On Ubuntu, use OpenJDK.

Java 7: For the latest version of Android

$ sudo apt-get update
$ sudo apt-get install openjdk-7-jdk
（tips：安装需要 111MB）

Optionally, update the default Java version by running:

$ sudo update-alternatives --config java
$ sudo update-alternatives --config javac

If you encounter version errors for Java, set its path as described in the Wrong Java Version section.

To develop older versions of Android, download and install the corresponding version of the Java JDK:
Java 6: for Gingerbread through KitKat
Java 5: for Cupcake through Froyo

Note: The lunch command in the build step will ensure that the Sun JDK is
used instead of any previously installed JDK.

Installing required packages (Ubuntu 12.04)

You will need a 64-bit version of Ubuntu. Ubuntu 12.04 is recommended.
Building using an older version of Ubuntu is not supported on master or recent releases.

$ sudo apt-get install git gnupg flex bison gperf build-essential \
  zip curl libc6-dev libncurses5-dev:i386 x11proto-core-dev \
  libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386 \
  libgl1-mesa-dev g++-multilib mingw32 tofrodos \
  python-markdown libxml2-utils xsltproc zlib1g-dev:i386
$ sudo ln -s /usr/lib/i386-linux-gnu/mesa/libGL.so.1 /usr/lib/i386-linux-gnu/libGL.so

Installing required packages (Ubuntu 14.04)

Building on Ubuntu 14.04 is experimental at the moment but will eventually become the recommended environment.

$ sudo apt-get install bison g++-multilib git gperf libxml2-utils

Installing required packages (Ubuntu 10.04 -- 11.10)

Building on Ubuntu 10.04-11.10 is no longer supported, but may be useful for building older releases of AOSP.

$ sudo apt-get install git gnupg flex bison gperf build-essential \
  zip curl zlib1g-dev libc6-dev lib32ncurses5-dev ia32-libs \
  x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev \
  libgl1-mesa-dev g++-multilib mingw32 tofrodos python-markdown \
  libxml2-utils xsltproc

On Ubuntu 10.10:

$ sudo ln -s /usr/lib32/mesa/libGL.so.1 /usr/lib32/mesa/libGL.so

On Ubuntu 11.10:

$ sudo apt-get install libx11-dev:i386

Configuring USB Access

Under GNU/linux systems (and specifically under Ubuntu systems), regular users can't directly access USB devices by default. The system needs to be configured to allow such access.

The recommended approach is to create a file /etc/udev/rules.d/51-android.rules (as the root user) and to copy the following lines in it. <username> must be replaced by the actual username of the user who is authorized to access the phones over USB.

# adb protocol on passion (Nexus One)
SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4e12", MODE="0600", OWNER="<username>"
# fastboot protocol on passion (Nexus One)
SUBSYSTEM=="usb", ATTR{idVendor}=="0bb4", ATTR{idProduct}=="0fff", MODE="0600", OWNER="<username>"
# adb protocol on crespo/crespo4g (Nexus S)
SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4e22", MODE="0600", OWNER="<username>"
# fastboot protocol on crespo/crespo4g (Nexus S)
SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4e20", MODE="0600", OWNER="<username>"
# adb protocol on stingray/wingray (Xoom)
SUBSYSTEM=="usb", ATTR{idVendor}=="22b8", ATTR{idProduct}=="70a9", MODE="0600", OWNER="<username>"
# fastboot protocol on stingray/wingray (Xoom)
SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="708c", MODE="0600", OWNER="<username>"
# adb protocol on maguro/toro (Galaxy Nexus)
SUBSYSTEM=="usb", ATTR{idVendor}=="04e8", ATTR{idProduct}=="6860", MODE="0600", OWNER="<username>"
# fastboot protocol on maguro/toro (Galaxy Nexus)
SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4e30", MODE="0600", OWNER="<username>"# adb protocol on panda (PandaBoard)SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="d101", MODE="0600", OWNER="<username>"# adb protocol on panda (PandaBoard ES)SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="d002", MODE="0600", OWNER="<username>"# fastboot protocol on panda (PandaBoard)SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="d022", MODE="0600", OWNER="<username>"# usbboot protocol on panda (PandaBoard)SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="d00f", MODE="0600", OWNER="<username>"# usbboot protocol on panda (PandaBoard ES)SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="d010", MODE="0600", OWNER="<username>"# adb protocol on grouper/tilapia (Nexus 7)SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4e42", MODE="0600", OWNER="<username>"# fastboot protocol on grouper/tilapia (Nexus 7)SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4e40", MODE="0600", OWNER="<username>"# adb protocol on manta (Nexus 10)SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4ee2", MODE="0600", OWNER="<username>"# fastboot protocol on manta (Nexus 10)SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="4ee0", MODE="0600", OWNER="<username>"

Those new rules take effect the next time a device is plugged in. It might therefore be necessary to unplug the device and plug it back into the computer.

This is known to work on both Ubuntu Hardy Heron (8.04.x LTS) and Lucid Lynx (10.04.x LTS). Other versions of Ubuntu or other variants of GNU/linux might require different configurations.

Setting up ccache

You can optionally tell the build to use the ccache compilation tool. Ccache acts as a compiler cache that can be used to speed-up rebuilds. This works very well if you do "make clean" often, or if you frequently switch between different build products.

Put the following in your .bashrc or equivalent.

export USE_CCACHE=1

By default the cache will be stored in ~/.ccache. If your home directory is on NFS or some other non-local filesystem, you will want to specify the directory in your .bashrc as well.

export CCACHE_DIR=<path-to-your-cache-directory>

The suggested cache size is 50-100GB. You will need to run the following command once you have downloaded the source code:

prebuilts/misc/linux-x86/ccache/ccache -M 50G

When building Ice Cream Sandwich (4.0.x) or older, ccache is in a different location:

prebuilt/linux-x86/ccache/ccache -M 50G

This setting is stored in the CCACHE_DIR and is persistent.

Using a separate output directory

By default, the output of each build is stored in the out/ subdirectory of the matching source tree.

On some machines with multiple storage devices, builds are faster when storing the source files and the output on separate volumes. For additional performance, the output can be stored on a filesystem optimized for speed instead of crash robustness, since all files can be re-generated in case of filesystem corruption.

To set this up, export the OUT_DIR_COMMON_BASE variable to point to the location where your output directories will be stored.

export OUT_DIR_COMMON_BASE=<path-to-your-out-directory>

The output directory for each separate source tree will be named after the directory holding the source tree.

For instance, if you have source trees as /source/master1 and /source/master2 and OUT_DIR_COMMON_BASE is set to /output, the output directories will be /output/master1 and /output/master2.

It's important in that case to not have multiple source trees stored in directories that have the same name, as those would end up sharing an output directory, with unpredictable results.

This is only supported on Jelly Bean (4.1) and newer, including the master branch.

Downloading the Source

In this document

1. Installing Repo
2. Initializing a Repo client
3. Downloading the Android Source Tree
4. Using Authentication
5. Troubleshooting network issues
6. Using a local mirror
7. Verifying Git Tags

The Android source tree is located in a Git repository hosted by Google. This document describes how to download the source tree for a specific Android code-line.

Installing Repo

---

Repo is a tool that makes it easier to work with Git in the context of Android. For more information about Repo, see the Developing section.

To install Repo:

1. Make sure you have a bin/ directory in your home directory and that it is included in your path:

   $ mkdir ~/bin
   $ PATH=~/bin:$PATH
   

2. Download the Repo tool and ensure that it is executable:

   $ curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
   $ chmod a+x ~/bin/repo

（tips：如果没有安装curl,   sudo apt-get install curl）

For version 1.17, the SHA-1 checksum for repo is ddd79b6d5a7807e911b524cb223bc3544b661c28

For version 1.19, the SHA-1 checksum for repo is 92cbad8c880f697b58ed83e348d06619f8098e6c

For version 1.20, the SHA-1 checksum for repo is e197cb48ff4ddda4d11f23940d316e323b29671c

For version 1.21, the SHA-1 checksum for repo is b8bd1804f432ecf1bab730949c82b93b0fc5fede

Initializing a Repo client

---

After installing Repo, set up your client to access the Android source repository:

1. Create an empty directory to hold your working files. If you're using MacOS, this has to be on a case-sensitive filesystem. Give it any name you like:

   $ mkdir WORKING_DIRECTORY
   $ cd WORKING_DIRECTORY

2. Run repo init to bring down the latest version of Repo with all its most recent bug fixes. You must specify a URL for the manifest, which specifies where the various repositories included in the Android source will be placed within your working directory.

   $ repo init -u https://android.googlesource.com/platform/manifest

   To check out a branch other than "master", specify it with -b. For a list of branches, see Source Code Tags and Builds.

   $ repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1

3. When prompted, configure Repo with your real name and email address. To use the Gerrit code-review tool, you will need an email address that is connected with a registered Google account. Make sure this is a live address at which you can receive messages. The name that you provide here will show up in attributions for your code submissions.

A successful initialization will end with a message stating that Repo is initialized in your working directory. Your client directory should now contain a .repo directory where files such as the manifest will be kept.

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" alt="" />

Downloading the Android Source Tree

---

To pull down the Android source tree to your working directory from the repositories as specified in the default manifest, run

$ repo sync

The Android source files will be located in your working directory under their project names. The initial sync operation will take an hour or more to complete. For more about repo sync and other Repo commands, see the Developing section.

Using Authentication

---

By default, access to the Android source code is anonymous. To protect the servers against excessive usage, each IP address is associated with a quota.

When sharing an IP address with other users (e.g. when accessing the source repositories from beyond a NAT firewall), the quotas can trigger even for regular usage patterns (e.g. if many users sync new clients from the same IP address within a short period).

In that case, it is possible to use authenticated access, which then uses a separate quota for each user, regardless of the IP address.

The first step is to create a password with the password generator and follow the instructions on the password generator page.

The second step is to force authenticated access, by using the following manifest URI: https://android.googlesource.com/a/platform/manifest. Notice how the /a/ directory prefix triggers mandatory authentication. You can convert an existing client to use mandatory authentication with the following command:

$ repo init -u https://android.googlesource.com/a/platform/manifest

Troubleshooting network issues

---

When downloading from behind a proxy (which is common in some corporate environments), it might be necessary to explicitly specify the proxy that is then used by repo:

$ export HTTP_PROXY=http://<proxy_user_id>:<proxy_password>@<proxy_server>:<proxy_port>
$ export HTTPS_PROXY=http://<proxy_user_id>:<proxy_password>@<proxy_server>:<proxy_port>

More rarely, Linux clients experience connectivity issues, getting stuck in the middle of downloads (typically during "Receiving objects"). It has been reported that tweaking the settings of the TCP/IP stack and using non-parallel commands can improve the situation. You need root access to modify the TCP setting:

$ sudo sysctl -w net.ipv4.tcp_window_scaling=0
$ repo sync -j1

Using a local mirror

---

When using several clients, especially in situations where bandwidth is scarce, it is better to create a local mirror of the entire server content, and to sync clients from that mirror (which requires no network access). The download for a full mirror is smaller than the download of two clients, while containing more information.

These instructions assume that the mirror is created in /usr/local/aosp/mirror. The first step is to create and sync the mirror itself. Notice the --mirror flag, which can be specified only when creating a new client:

$ mkdir -p /usr/local/aosp/mirror
$ cd /usr/local/aosp/mirror
$ repo init -u https://android.googlesource.com/mirror/manifest --mirror
$ repo sync

Once the mirror is synced, new clients can be created from it. Note that it's important to specify an absolute path:

$ mkdir -p /usr/local/aosp/master
$ cd /usr/local/aosp/master
$ repo init -u /usr/local/aosp/mirror/platform/manifest.git
$ repo sync

Finally, to sync a client against the server, the mirror needs to be synced against the server, then the client against the mirror:

$ cd /usr/local/aosp/mirror
$ repo sync
$ cd /usr/local/aosp/master
$ repo sync

It's possible to store the mirror on a LAN server and to access it over NFS, SSH or Git. It's also possible to store it on a removable drive and to pass that drive around between users or between machines.

Verifying Git Tags

---

Load the following public key into your GnuPG key database. The key is used to sign annotated tags that represent releases.

$ gpg --import

Copy and paste the key(s) below, then enter EOF (Ctrl-D) to end the input and process the keys.

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.2.2 (GNU/Linux)
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=Wi5D
-----END PGP PUBLIC KEY BLOCK-----

After importing the keys, you can verify any tag with

$ git tag -v TAG_NAME

If you haven't set up ccache yet, now would be a good time to do it.

---

相关的版本：

Source Code Tags and Builds

---

Starting with Donut, the exact list of tags and builds is in the following table. Factory images and binaries for Nexus devices can be downloaded from:

https://developers.google.com/android/nexus/images

https://developers.google.com/android/nexus/drivers

Build	Branch	Version	Supported devices
LRX22G	android-5.0.2_r1	Lollipop	Nexus 7 (flo/deb/grouper/tilapia), Nexus 10
LRX22C	android-5.0.1_r1	Lollipop	Nexus 4, Nexus 5, Nexus 6 (shamu), Nexus 7 (flo), Nexus 9 (volantis/volantisg), Nexus 10
LRX21V	android-5.0.0_r7.0.1	Lollipop	Nexus Player (fugu)
LRX21T	android-5.0.0_r6.0.1	Lollipop	Nexus 4
LRX21R	android-5.0.0_r5.1.0.1	Lollipop	Nexus 9 (volantis)
LRX21Q	android-5.0.0_r5.0.1	Lollipop	Nexus 9 (volantis)
LRX21P	android-5.0.0_r4.0.1	Lollipop	Nexus 7 (flo/grouper), Nexus 10
LRX21O	android-5.0.0_r3.0.1	Lollipop	Nexus 5 (hammerhead), Nexus 6 (shamu)
LRX21M	android-5.0.0_r2.0.1	Lollipop	Nexus Player (fugu)
LRX21L	android-5.0.0_r1.0.1	Lollipop	Nexus 9 (volantis)
KTU84Q	android-4.4.4_r2	KitKat	Nexus 5 (hammerhead) (For 2Degrees/NZ, Telstra/AUS and India ONLY)
KTU84P	android-4.4.4_r1	KitKat	Nexus 5, Nexus 7 (flo/deb/grouper/tilapia), Nexus 4, Nexus 10
KTU84M	android-4.4.3_r1.1	KitKat	Nexus 5 (hammerhead)
KTU84L	android-4.4.3_r1	KitKat	Nexus 7 (flo/deb/grouper/tilapia), Nexus 4, Nexus 10
KVT49L	android-4.4.2_r2	KitKat	Nexus 7 (deb Verizon)
KOT49H	android-4.4.2_r1	KitKat	Nexus 5, Nexus 7 (flo/deb/grouper/tilapia), Nexus 4, Nexus 10
KOT49E	android-4.4.1_r1	KitKat	Nexus 5, Nexus 7 (flo/deb/grouper/tilapia), Nexus 4, Nexus 10
KRT16S	android-4.4_r1.2	KitKat	Nexus 7 (flo/deb/grouper/tilapia), Nexus 4, Nexus 10
KRT16M	android-4.4_r1	KitKat	Nexus 5 (hammerhead)
JLS36I	android-4.3.1_r1	Jelly Bean	Nexus 7 (deb)
JLS36C	android-4.3_r3	Jelly Bean	Nexus 7 (deb)
JSS15R	android-4.3_r2.3	Jelly Bean	Nexus 7 (flo)
JSS15Q	android-4.3_r2.2	Jelly Bean	Nexus 7 (flo)
JSS15J	android-4.3_r2.1	Jelly Bean	Nexus 7 (flo/deb)
JSR78D	android-4.3_r2	Jelly Bean	Nexus 7 (deb)
JWR66Y	android-4.3_r1.1	Jelly Bean	Galaxy Nexus, Nexus 7 (grouper/tilapia), Nexus 4, Nexus 10
JWR66V	android-4.3_r1	Jelly Bean	Galaxy Nexus, Nexus 7 (grouper/tilapia), Nexus 4, Nexus 10
JWR66N	android-4.3_r0.9.1	Jelly Bean	Galaxy Nexus, Nexus 7 (grouper/tilapia/flo), Nexus 4, Nexus 10
JWR66L	android-4.3_r0.9	Jelly Bean	Nexus 7
JDQ39E	android-4.2.2_r1.2	Jelly Bean	Nexus 4
JDQ39B	android-4.2.2_r1.1	Jelly Bean	Nexus 7
JDQ39	android-4.2.2_r1	Jelly Bean	Galaxy Nexus, Nexus 7, Nexus 4, Nexus 10
JOP40G	android-4.2.1_r1.2	Jelly Bean	Nexus 4
JOP40F	android-4.2.1_r1.1	Jelly Bean	Nexus 10
JOP40D	android-4.2.1_r1	Jelly Bean	Galaxy Nexus, Nexus 7, Nexus 4, Nexus 10
JOP40C	android-4.2_r1	Jelly Bean	Galaxy Nexus, Nexus 7, Nexus 4, Nexus 10
JZO54M	android-4.1.2_r2.1	Jelly Bean
JZO54L	android-4.1.2_r2	Jelly Bean
JZO54K	android-4.1.2_r1	Jelly Bean	Nexus S, Galaxy Nexus, Nexus 7
JRO03S	android-4.1.1_r6.1	Jelly Bean	Nexus 7
JRO03R	android-4.1.1_r6	Jelly Bean	Nexus S 4G
JRO03O	android-4.1.1_r5	Jelly Bean	Galaxy Nexus
JRO03L	android-4.1.1_r4	Jelly Bean	Nexus S
JRO03H	android-4.1.1_r3	Jelly Bean
JRO03E	android-4.1.1_r2	Jelly Bean	Nexus S
JRO03D	android-4.1.1_r1.1	Jelly Bean	Nexus 7
JRO03C	android-4.1.1_r1	Jelly Bean	Galaxy Nexus
IMM76L	android-4.0.4_r2.1	Ice Cream Sandwich
IMM76K	android-4.0.4_r2	Ice Cream Sandwich	Galaxy Nexus
IMM76I	android-4.0.4_r1.2	Ice Cream Sandwich	Galaxy Nexus
IMM76D	android-4.0.4_r1.1	Ice Cream Sandwich	Nexus S, Nexus S 4G, Galaxy Nexus
IMM76	android-4.0.4_r1	Ice Cream Sandwich
IML77	android-4.0.3_r1.1	Ice Cream Sandwich
IML74K	android-4.0.3_r1	Ice Cream Sandwich	Nexus S
ICL53F	android-4.0.2_r1	Ice Cream Sandwich	Galaxy Nexus
ITL41F	android-4.0.1_r1.2	Ice Cream Sandwich	Galaxy Nexus
ITL41D	android-4.0.1_r1.1	Ice Cream Sandwich	Galaxy Nexus
ITL41D	android-4.0.1_r1	Ice Cream Sandwich	Galaxy Nexus
GWK74	android-2.3.7_r1	Gingerbread	Nexus S 4G
GRK39F	android-2.3.6_r1	Gingerbread	Nexus One, Nexus S
GRK39C	android-2.3.6_r0.9	Gingerbread	Nexus S
GRJ90	android-2.3.5_r1	Gingerbread	Nexus S 4G
GRJ22	android-2.3.4_r1	Gingerbread	Nexus One, Nexus S, Nexus S 4G
GRJ06D	android-2.3.4_r0.9	Gingerbread	Nexus S 4G
GRI54	android-2.3.3_r1.1	Gingerbread	Nexus S
GRI40	android-2.3.3_r1	Gingerbread	Nexus One, Nexus S
GRH78C	android-2.3.2_r1	Gingerbread	Nexus S
GRH78	android-2.3.1_r1	Gingerbread	Nexus S
GRH55	android-2.3_r1	Gingerbread	earliest Gingerbread version, Nexus S
FRK76C	android-2.2.3_r2	Froyo
FRK76	android-2.2.3_r1	Froyo
FRG83G	android-2.2.2_r1	Froyo	Nexus One
FRG83D	android-2.2.1_r2	Froyo	Nexus One
FRG83	android-2.2.1_r1	Froyo	Nexus One
FRG22D	android-2.2_r1.3	Froyo
FRG01B	android-2.2_r1.2	Froyo
FRF91	android-2.2_r1.1	Froyo	Nexus One
FRF85B	android-2.2_r1	Froyo	Nexus One
EPF21B	android-2.1_r2.1p2	Eclair
ESE81	android-2.1_r2.1s	Eclair
EPE54B	android-2.1_r2.1p	Eclair	Nexus One
ERE27	android-2.1_r2	Eclair	Nexus One
ERD79	android-2.1_r1	Eclair	Nexus One
ESD56	android-2.0.1_r1	Eclair
ESD20	android-2.0_r1	Eclair
DMD64	android-1.6_r1.5	Donut
DRD20	android-1.6_r1.4
DRD08	android-1.6_r1.3
DRC92	android-1.6_r1.2

The branches froyo, gingerbread, ics-mr0, ics-mr1, jb-dev, jb-mr1-dev, jb-mr1.1-dev, jb-mr2-dev, kitkat-dev represent development branches that do not exactly match configurations that were tested by Google. They might contain a variety of changes in addition to the official tagged releases, and those haven't been as thoroughly tested.