I'm not sure if anyone tested chroot setup for ARM host platforms. As far as I know all the work was done to create chroot setup for x86 ones:

https://wiki.merproject.org/wiki/Platform_SDK
https://wiki.merproject.org/wiki/Platform_SDK_and_SB2

In order to develop, one doesn't need to put the chrooted environment on the ARM device - you can put it on x86 host. But for running - it can be helpful, and should be possible in theory.

See also https://wiki.merproject.org/wiki/Pla...DK_Development

Visit #mer channel on freenode.net to discuss it, if you are interested in helping developing such setup.