On Mon, 2010-10-04 at 12:06 -0400, Albert Cahalan wrote: > On Mon, Oct 4, 2010 at 12:25 AM, Segher Boessenkool > <seg...@kernel.crashing.org> wrote: > > > The PowerPC OF binding requires the firmware to save and restore > > the BATs on entry to / exit from the firmware. > > This sucks, because using the BAT is **much** easier for > the firmware. In my case, it also means I don't need to worry > about Linux stomping on anything -- I have nothing in RAM.
What FW are we talking about here anyways ? As I said, Linux isn't supposed to take any fault from the moment it starts setting up BATs to the moment it takes over exceptions and can handle faults all by itself. > (this is an emulator, but I don't want to cheat too much > because adding special cases affects performance) > > Page tables would need to go in RAM. If Linux wants to > use that memory...? It seems that Linux does tend to ask; > will it panic if I refuse? Are there addresses Linux won't > ever ask for? > > It also looks like I could just start up Linux w/o the MMU on. > I'm just making 1:1 mappings anyway. Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
