Comment 5 for bug 605694

Unfortunately, adding a PPA is likely one of the last steps in enabling a new architecture, as it requires that architecture to be fully supported in Ubuntu, and have working virtualisation.

So, based on ports that have appeared in the past, the following things seem to need to happen in order for it to be done.

1) Someone needs to be maintaining an Ubuntu kernel for the architecture (using all the Ubuntu sauce, etc.)
2) Someone needs to be actively maintaining the Ubuntu toolchain to ensure it works on that architecture
3) Someone needs to have bootstrapped a good chunk of the archive (Ubuntu Desktop is often the first target)
4) The architecture needs to be supported in Debian (although compiler defaults, etc. may differ)
5) There need to be a sufficient set of folks willing to test on that architecture

Once all those conditions are met, it's mostly a matter of getting trusted buildds into the Canonical data centre. I don't know the precise procedure for that, but I'd guess that if the 5 conditions above were met, and hardware was available, one might start by making a request to rt.ubuntu.com. Note that this may take a long time to get a response, as there are many more time-critical tasks that the folk who process the RTs need to do.

    All that said, I'll note that someone had a working toolchain port for Intrepid, so it's not infeasible to do something.