On Tue, May 07, 2019 at 05:48:20PM +0200, Thomas Bogendoerfer wrote: > > I had a look and the code is really, really MIPS specific, actually > > I would be interested in understanding how many platforms it supports, > > it is not even FW configurable. > > it's MIPS only and used in basically 3 different SGI platforms. Actually this isn't quite true, this whole infraѕtructure was also shared by the SGI IA64 systems. The early SN1 prototypes were basically just IP35 systems with IA64 CPUs glued in, and even the later SN2 that were released as Altix shared the same xtalk + bridge infrastructure, just with some hardware updates. It just turned out SGI at some point decided to hide all that in firmware. Linux 2.4 was still accessing this natively, but the code was a mess. I tried to consolidate it with the mips version at that point, but SGI decided that hiding it under firmware calls was easier as they could just move the messy code there. So, not it isn't really MIPS only in theory, although in practice it very much is..
