The HP Chromebook is called daisy_spring. You'll need to change the kernel.its file to pull in (with the 3.4 kernel) exynos5250-spring.dtb instead of exynos5250-snow-rev4.dtb - that should be the only change needed.

I have an HP Chromebook on the way, and hope to have a new way to do images, but unfortunately, the nv-uboot way I do the new Samsung image requires a new nv-uboot for the HP one too :/

Replacing exynos5250-snow-rev4.dtb with exynos5250-spring.dtb in the build script from the Offensive-Security github ( https://github.com/offensive-security/Kali-ARM-Build-Scripts/blob/master/chromebook.sh ) yielded a thumb drive that when booted to produces a loud humming noise then returns you to the dev mode white screen.

Correct - as mentioned the nv-uboot way I do the new Samsung image requires a new nv-uboot for the HP one. As that doesn't exist yet, it won't work, and you'll need to follow the instructions on the site - or, wait until later today and I'll push out a new script specifically for the HP Chromebook, but again, I don't have one so it won't be tested, but it should work. I'm available on IRC as steev if you have any questions as well.

An image has been created and tested by PrymalInstynct.