linaro android for help

I want to use fastmodel to run a android system.As the document say,it used "vexpressrtsm-ics-gcc46-armlt-stable-open-12.04-release".When I download the source code using the script "linaro_android_build_cmds.sh",there are errors in it.

So,I want to know the differences between vexpress-jb- vexpress-linaro-mp- vexpress-lsk- vexpress-linaro- ,and which version can replace "vexpressrtsm-ics-gcc46-armlt-stable-open-12.04-release"?

Looking forward to your answer.