I have a board here with 128GB Ram (16*8GB) and it won't boot. It hangs at "Copying data from cache to RAM -- switching to use RAM as stack...". So at least ram initialization is done, but why does it stop booting? Some values I have to increment in order to use more RAM?
Most likely RAM init didn't work. You could run showallroutes() right before that message and do some basic RAM tests to see.
Thanks, Myles