cm

来人啊
　　　--来自google　Nexus5　

有在用这个版本的不？
　　　--来自google　Nexus5　

CAF is a custom Linux kernel branch in place to support Qualcomm hardware. By using a potentially heavily customized kernel (while AOSP Android uses the main Linux kernel), custom kernel developers will have to effectively maintain two separate instances of their customizations.
搜一下就好了。一个在高通平台上的分支内核版本。