I finally got to this and wrote up a summary of the contents of the ST-E BSP that we are mirroring on the Linaro git server:
https://wiki.linaro.org/BSP/ST-Ericsson
I did not write up my recommendations of how to proceed, but it should give an idea of the work in front of us/them.
Linus, if you see any significant omissions or mistakes, please correct me.
Arnd