android api22, arm images
root@generic:/ # cat /proc/version Linux version 3.4.67-01422-gd3ffcc7-dirty (digit@tyrion.par.corp.google.com) (gcc version 4.8 (GCC) ) #1 PREEMPT Tue Sep 16 19:34:06 CEST 2014
内核版本3.4.67，下载goldfish代码：
git clone git://mirrors.ustc.edu.cn/aosp/kernel/goldfish.git
$ git branch -a * (no branch) master remotes/origin/HEAD -> origin/master remotes/origin/android-3.10 remotes/origin/android-3.18 remotes/origin/android-3.4 remotes/origin/android-goldfish-2.6.29 remotes/origin/android-goldfish-3.10 remotes/origin/android-goldfish-3.10-l-mr1-dev remotes/origin/android-goldfish-3.10-m-dev remotes/origin/android-goldfish-3.18-dev remotes/origin/android-goldfish-3.4 remotes/origin/android-goldfish-3.4-l-mr1-dev remotes/origin/android-goldfish-4.4-dev remotes/origin/linux-goldfish-3.0-wip remotes/origin/mastergit checkout remotes/origin/android-goldfish-3.4
但是，预编译好的kernel-qemu到底对应了哪个commit id呢？
看版本号，发现g后面的就是commit id，d3ffcc7
然后git checkout d3ffcc7就可以了
android api22， x86 images
root@generic_x86:/ # cat /proc/version Linux version 3.4.67+ (digit@tyrion.par.corp.google.com) (gcc version 4.8 (GCC) ) #3 PREEMPT Tue Sep 16 19:46:22 CEST 2014没有goldfish commit id信息，怎么玩呢？
1、求取预编译的kernel-qemu的md5sum为6c5f6f4359c7b94b637ef266387c5ff9
2、cd android-5.1.0_r1/prebuilts/qemu-kernel/
3、求取x86/kernel-qemu的md5sum，对比是否相同
4、相同，那么看commit msg，里面有说明对应的goldfish commit id是多少
5、不同，git reset --hard <上一次的prebuilts commit id>，回到第3步
最后，得到的commit msg是：
commit 2cd41c75898f6eb19619e4d03fd39e08821a1e38
Author: David 'Digit' Turner <digit@google.com>
Date: Wed Sep 17 00:14:04 2014 +0200
Upgrade qemu kernels to support multinetwork.
This patch updates the binaries of emulator-specific kernels to
the following revisions (https://android.googlesource.com/kernel/goldfish):
android-goldfish-3.4: ea97df6 goldfish: Enable multinetwork kernel featu
android-goldfish-3.10: 64a0393 goldfish: Enable multinetwork kernel featu
The main goals is to get multinetwork working, which is required to
properly emulate Android L and beyond. This also includes other patches,
including compatibility-related patches for the ARM64 kernel that make
ARMv7 binaries run properly under it.
BUG=17516983
Change-Id: I2f1c352b72ca6b254dbcb9732dee3c014867ae99
goldfish commit id是ea97df6
PS：如果用md5sum的方式，得到的arm的goldfish commit id也是ea97df6
