I could be wrong but I think that the Marvell CPU is an ARM processor (not an x86) so I don't think it will work. You could try though and see how it goes. You may have to build your own Ubuntu and Debian both support the ARM architechture.
But specifically on the x86 (32 bit) version. It is not currently available in any other architechture. I know the core devs have plans to support x64 on their agenda and I'm sure they'd like to support ARM too, but currently x86 is the only one available.
I hope TKL will have this feature on their to-do-list. If TKL can develop on sheeva/dreamplug/tornido plugs as an standalone appliance (low cost hardware and electricity consumption) , that will be perfect for various small organisations and developers.
I'm not a developer but enthusiast of Linux and I would be happy to help in any way possible.
But unfortunately they also have a todo list a mile long and only 2 core devs. Some time ago there was a discussion of perhaps creating hardware appliances on similar hardware that were actually TKL branded (to create an income stream for TKL to assist with costs and development - beyond the 10% premium on EC2). This would obviously also mean that they would need to build ARM architechture appliances.
AFAIK the core devs are working to upgrade their backend build infrastructure to make it easier to build/upgrade/appliances appliances. I'm fairly sure that that will make it easier for them to build for alternative architechtures (such as x64; ARM too hopefully).
I could be wrong but I think that the Marvell CPU is an ARM processor (not an x86) so I don't think it will work. You could try though and see how it goes. You may have to build your own Ubuntu and Debian both support the ARM architechture.