参考网站：
https://wiki.codeaurora.org/xwiki/bin/QAEP/
https://wiki.codeaurora.org/xwiki/bin/QAEP/release

1.首先下载repo：
a）终端运行git clone git://codeaurora.org/tools/repo.git
b）mkdir ~/bin
c）拷贝repo 到~/bin下面，修改repo权限，chmod a+x ~/bin/repo
d）修改repo
将REPO_URL='git://android.git.kernel.org/tools/repo.git'改成：REPO_URL='git://codeaurora.org/tools/repo.git'

2.高通源码查找
打开https://wiki.codeaurora.org/xwiki/bin/QAEP/release，找到想要下载的代码的 Manifest（比如：LA.UM.8.2.1.r1-04200-sdm660.0.xml）

3.下载高通源码

以sdm660 android 10.0为例：

a）终端运行 ~/bin/repo init -u git://codeaurora.org/platform/manifest.git -b release -m LA.UM.8.2.1.r1-04200-sdm660.0.xml --repo-url=git://codeaurora.org/tools/repo.git --repo-branch=caf-stable

===> 实测如果使用上面的命令一直卡住的话，可以后面repo 的删了，如下：
~/bin/repo init -u git://codeaurora.org/platform/manifest.git -b release -m LA.UM.8.2.1.r1-04200-sdm660.0.xml

b）repo sync

实测结果如下：

sh:~/works/sdm660$ ~/bin/repo init -u git://codeaurora.org/platform/manifest.git -b release  -m LA.UM.8.2.1.r1-04200-sdm660.0.xml
Getting repo ...from git://codeaurora.org/tools/repo.git
remote: Enumerating objects: 5506, done.
remote: Counting objects: 100% (5506/5506), done.
remote: Compressing objects: 100% (2529/2529), done.
remote: Total 5506 (delta 3743), reused 4306 (delta 2912)
Receiving objects: 100% (5506/5506), 1.31 MiB | 26.00 KiB/s, done.
Resolving deltas: 100% (3743/3743), done.
From git://codeaurora.org/tools/repo* [new branch]      aosp-new/maint -> origin/aosp-new/maint* [new branch]      aosp-new/master -> origin/aosp-new/master* [new branch]      aosp-new/repo-1 -> origin/aosp-new/repo-1* [new branch]      aosp-new/stable -> origin/aosp-new/stable* [new branch]      caf-stable -> origin/caf-stable* [new branch]      master     -> origin/master* [new branch]      stable     -> origin/stable* [new tag]         v1.12.16   -> v1.12.16* [new tag]         v1.13.11   -> v1.13.11* [new tag]         v1.6.8.1   -> v1.6.8.1* [new tag]         v1.7.5     -> v1.7.5* [new tag]         v2.5       -> v2.5* [new tag]         v1.0       -> v1.0* [new tag]         v1.0.1     -> v1.0.1* [new tag]         v1.0.2     -> v1.0.2* [new tag]         v1.0.3     -> v1.0.3* [new tag]         v1.0.4     -> v1.0.4* [new tag]         v1.0.5     -> v1.0.5* [new tag]         v1.0.6     -> v1.0.6* [new tag]         v1.0.7     -> v1.0.7* [new tag]         v1.0.8     -> v1.0.8* [new tag]         v1.0.9     -> v1.0.9* [new tag]         v1.1       -> v1.1* [new tag]         v1.10.0    -> v1.10.0* [new tag]         v1.10.1    -> v1.10.1* [new tag]         v1.10.2    -> v1.10.2* [new tag]         v1.10.3    -> v1.10.3* [new tag]         v1.10.4    -> v1.10.4* [new tag]         v1.11.0    -> v1.11.0* [new tag]         v1.11.1    -> v1.11.1* [new tag]         v1.12.0    -> v1.12.0* [new tag]         v1.12.1    -> v1.12.1* [new tag]         v1.12.10   -> v1.12.10* [new tag]         v1.12.11   -> v1.12.11* [new tag]         v1.12.12   -> v1.12.12* [new tag]         v1.12.13   -> v1.12.13* [new tag]         v1.12.14   -> v1.12.14* [new tag]         v1.12.15   -> v1.12.15* [new tag]         v1.12.17   -> v1.12.17* [new tag]         v1.12.18   -> v1.12.18* [new tag]         v1.12.19   -> v1.12.19* [new tag]         v1.12.2    -> v1.12.2* [new tag]         v1.12.20   -> v1.12.20* [new tag]         v1.12.21   -> v1.12.21* [new tag]         v1.12.22   -> v1.12.22* [new tag]         v1.12.23   -> v1.12.23* [new tag]         v1.12.24   -> v1.12.24* [new tag]         v1.12.25   -> v1.12.25* [new tag]         v1.12.26   -> v1.12.26* [new tag]         v1.12.27   -> v1.12.27* [new tag]         v1.12.28   -> v1.12.28* [new tag]         v1.12.29   -> v1.12.29* [new tag]         v1.12.3    -> v1.12.3* [new tag]         v1.12.3.1  -> v1.12.3.1* [new tag]         v1.12.30   -> v1.12.30* [new tag]         v1.12.30.1 -> v1.12.30.1* [new tag]         v1.12.31   -> v1.12.31* [new tag]         v1.12.32   -> v1.12.32* [new tag]         v1.12.33   -> v1.12.33* [new tag]         v1.12.34   -> v1.12.34* [new tag]         v1.12.35   -> v1.12.35* [new tag]         v1.12.36   -> v1.12.36* [new tag]         v1.12.37   -> v1.12.37* [new tag]         v1.12.4    -> v1.12.4* [new tag]         v1.12.5    -> v1.12.5* [new tag]         v1.12.6    -> v1.12.6* [new tag]         v1.12.7    -> v1.12.7* [new tag]         v1.12.8    -> v1.12.8* [new tag]         v1.12.9    -> v1.12.9* [new tag]         v1.13.0    -> v1.13.0* [new tag]         v1.13.1    -> v1.13.1* [new tag]         v1.13.10   -> v1.13.10* [new tag]         v1.13.2    -> v1.13.2* [new tag]         v1.13.3    -> v1.13.3* [new tag]         v1.13.4    -> v1.13.4* [new tag]         v1.13.5    -> v1.13.5* [new tag]         v1.13.5.1  -> v1.13.5.1* [new tag]         v1.13.6    -> v1.13.6* [new tag]         v1.13.7    -> v1.13.7* [new tag]         v1.13.7.1  -> v1.13.7.1* [new tag]         v1.13.8    -> v1.13.8* [new tag]         v1.13.9    -> v1.13.9* [new tag]         v1.13.9.1  -> v1.13.9.1* [new tag]         v1.13.9.2  -> v1.13.9.2* [new tag]         v1.13.9.3  -> v1.13.9.3* [new tag]         v1.13.9.4  -> v1.13.9.4* [new tag]         v1.2       -> v1.2* [new tag]         v1.3       -> v1.3* [new tag]         v1.3.1     -> v1.3.1* [new tag]         v1.3.2     -> v1.3.2* [new tag]         v1.4       -> v1.4* [new tag]         v1.4.1     -> v1.4.1* [new tag]         v1.4.2     -> v1.4.2* [new tag]         v1.4.3     -> v1.4.3* [new tag]         v1.4.4     -> v1.4.4* [new tag]         v1.5       -> v1.5* [new tag]         v1.5.1     -> v1.5.1* [new tag]         v1.6       -> v1.6* [new tag]         v1.6.1     -> v1.6.1* [new tag]         v1.6.10    -> v1.6.10* [new tag]         v1.6.10.1  -> v1.6.10.1* [new tag]         v1.6.10.2  -> v1.6.10.2* [new tag]         v1.6.2     -> v1.6.2* [new tag]         v1.6.3     -> v1.6.3* [new tag]         v1.6.4     -> v1.6.4* [new tag]         v1.6.5     -> v1.6.5* [new tag]         v1.6.6     -> v1.6.6* [new tag]         v1.6.7     -> v1.6.7* [new tag]         v1.6.7.1   -> v1.6.7.1* [new tag]         v1.6.7.2   -> v1.6.7.2* [new tag]         v1.6.7.3   -> v1.6.7.3* [new tag]         v1.6.7.4   -> v1.6.7.4* [new tag]         v1.6.7.5   -> v1.6.7.5* [new tag]         v1.6.8     -> v1.6.8* [new tag]         v1.6.8.10  -> v1.6.8.10* [new tag]         v1.6.8.11  -> v1.6.8.11* [new tag]         v1.6.8.2   -> v1.6.8.2* [new tag]         v1.6.8.3   -> v1.6.8.3* [new tag]         v1.6.8.4   -> v1.6.8.4* [new tag]         v1.6.8.5   -> v1.6.8.5* [new tag]         v1.6.8.6   -> v1.6.8.6* [new tag]         v1.6.8.7   -> v1.6.8.7* [new tag]         v1.6.8.8   -> v1.6.8.8* [new tag]         v1.6.8.9   -> v1.6.8.9* [new tag]         v1.6.9     -> v1.6.9* [new tag]         v1.6.9.1   -> v1.6.9.1* [new tag]         v1.6.9.2   -> v1.6.9.2* [new tag]         v1.6.9.3   -> v1.6.9.3* [new tag]         v1.6.9.4   -> v1.6.9.4* [new tag]         v1.6.9.5   -> v1.6.9.5* [new tag]         v1.6.9.6   -> v1.6.9.6* [new tag]         v1.6.9.7   -> v1.6.9.7* [new tag]         v1.6.9.8   -> v1.6.9.8* [new tag]         v1.7       -> v1.7* [new tag]         v1.7.1     -> v1.7.1* [new tag]         v1.7.2     -> v1.7.2* [new tag]         v1.7.3     -> v1.7.3* [new tag]         v1.7.3.1   -> v1.7.3.1* [new tag]         v1.7.4     -> v1.7.4* [new tag]         v1.7.4.1   -> v1.7.4.1* [new tag]         v1.7.4.2   -> v1.7.4.2* [new tag]         v1.7.4.3   -> v1.7.4.3* [new tag]         v1.7.6     -> v1.7.6* [new tag]         v1.7.6.1   -> v1.7.6.1* [new tag]         v1.7.7     -> v1.7.7* [new tag]         v1.7.7.1   -> v1.7.7.1* [new tag]         v1.7.7.2   -> v1.7.7.2* [new tag]         v1.7.7.3   -> v1.7.7.3* [new tag]         v1.7.7.4   -> v1.7.7.4* [new tag]         v1.7.7.5   -> v1.7.7.5* [new tag]         v1.7.7.6   -> v1.7.7.6* [new tag]         v1.7.8     -> v1.7.8* [new tag]         v1.7.8.1   -> v1.7.8.1* [new tag]         v1.7.8.2   -> v1.7.8.2* [new tag]         v1.8.0     -> v1.8.0* [new tag]         v1.8.1     -> v1.8.1* [new tag]         v1.8.2     -> v1.8.2* [new tag]         v1.9.0     -> v1.9.0* [new tag]         v1.9.1     -> v1.9.1* [new tag]         v1.9.2     -> v1.9.2* [new tag]         v1.9.3     -> v1.9.3* [new tag]         v1.9.4     -> v1.9.4* [new tag]         v1.9.5     -> v1.9.5* [new tag]         v1.9.6     -> v1.9.6* [new tag]         v2.0       -> v2.0* [new tag]         v2.1       -> v2.1* [new tag]         v2.1.1     -> v2.1.1* [new tag]         v2.2       -> v2.2* [new tag]         v2.3       -> v2.3* [new tag]         v2.4       -> v2.4* [new tag]         v2.4.1     -> v2.4.1
Getting manifest ...from git://codeaurora.org/platform/manifest.git
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-289780ba2fd68c3045b2e5f53341abb892283d78.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-b611aef6dd1d895d0a80f5484c797fd258eca790.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-8adb8e346f3ccdff1fddfce6c1f90525d31de481.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-31f32dfb224432e115ce06c5058bde95e31ecb29.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-9e6efbbc029c0d7e5af8acaaa31e17b6bfba4a5f.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-9d849dc8a7090b6eeded3040690a175041593c70.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-0095ec11fd8ada994553dc29abbfdb4b9133ae19.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-f0ce9570a89e8db1ff6e97cd3977bf94b8498dd9.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-738d27f7c27524161dc9c266eb3a9fc1c74b63d5.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-f7733feb31ce32cd4eb463b810ef3893faaea5e8.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-708904016d372fb2ac7ba2090ad354bb53ba3bd3.pack
remote: warning: ignoring extra bitmap file: ./objects/pack/pack-7b33d17a1b33d9c4a9474d7b891b2ec622f7b963.pack
remote: Enumerating objects: 134775, done.
remote: Counting objects: 100% (134775/134775), done.
remote: Compressing objects: 100% (42477/42477), done.
Receiving objects:  44% (59705/134775), 9.86 MiB | 1024 bytes/s