After proposing this project I have a long interesting talk with Matt (Neko) on irc about kexecboot and Efika MX products. Main outcome was that kexecboot support isn't very useful on Efika MX because of Aura, which have possibility to do (at least part of) kexecboot's work too.

But working kexec give other goal to Efika MX products. Some products will be based on Chromium OS. This is good for ordinary user's ordinary tasks (read mail, news, look youtube, use google apps, etc) but may be insufficient for other users, which have other tasks (e.g. retouch some images in gimp or create a lot of formulas in TeX, etc). Having possibility to quick reboot into other distribution (e.g. Ubuntu) is very useful thing according to this.

So my proposal was transformed into "to make sure kexec works and test and test and test booting kernels on kexec" (с) Neko :)
My minimal proposal now is to do periodical tests of kexec on Efika MX with current kernel and report current status. But I hope I'll use board to test at least some parts of kexecboot too (FB UI functions, device scanning, etc).