I take it you are referring to the 32-bit image, as I can't find a 64-bit one.
I was shocked there are 64-bit Fedora 25 and 26 images available but not a CentOS 7 one, so I am putting one together at the moment. I'll post a link here on the list when I have tidied it up to make it presentable. One thing I still want to get working on it is Tianocore EFI, as at that point you don't need an image, you could just use the installer (if the installer iso were to be modified with a kernel that supports the Broadcom SoC, I'll see if I can spin up a suitable ISO with that modification when time permits).