Hi,
The Linaro OpenJDK 1605 Engineering Builds for JDK 7,8, 8u and 9 are available at http://openjdk.linaro.org/relhome.htm
The following is a list of the repos used to build each version
JDK 7 - http://icedtea.classpath.org/hg/icedtea7-forest
JDK 8u - http://hg.openjdk.java.net/aarch64-port/jdk8u
JDK 9 - http://hg.openjdk.java.net/jdk9/hs-comp
The version of gcc used for the builds was linaro gcc 4.8 and the builds were built natively on Ubuntu Trusty (14.04).
Regards, Stuart