Hi Bruno,
I'm running Proview in a Fox board G20 which also is an ARM 9. The difference is the the Fox board has a 1G microSD card with the debian file system. It's possible that the flash is to small and you'll need some external storage. It's mainly the .dbs files on $pwr_load and $pwrp_load that takes a lot of space. You'll also need a cross compiler and build the Proview runtime from source, and also use the cross compiler to build the plc of you project. I didn't find any information about any cross compiler on the home page.
How to build for ARM is described in the Release Notes for 4.8, Appendix A.
/Claes