On Friday 13 March 2009 14:21:57 Kumar Gala wrote: > > > > What does cat /proc/cpuinfo show on this board?
# cat /proc/cpuinfo processor : 0 cpu : e300c4 clock : 400.000000MHz revision : 1.0 (pvr 8086 2010) bogomips : 99.84 timebase : 50000000 platform : MPC5121 Generic > > +#ifdef CONFIG_PPC_MPC512x > > +/* MPC512x: workaround for errata in die M36P and earlier: > > + * Implement LRW for TLB way. > > + */ > > This errata impacts a number of cores and so we should make this a CPU > feature fixup rather than #ifdef code. It should impact only MPC5121e and probably MPC5123, but according to Freescale no other processors that use this core... Anyway, I'll try to investigate about how to write a "CPU feature fixup", I've never done that before (If you could give me a hint?) > > + mfspr r3,SPRN_DMISS > > + rlwinm r3,r3,19,25,29 /* Get Address bits 19:15 */ > > + lis r2,l...@ha /* Search index in lrw[] */ > > + addi r2,r2,l...@l > > + tophys(r2,r2) > > + lwzx r1,r3,r2 /* Get item from lrw[] */ > > + cmpwi 0,r1,0 /* Was it way 0 last time? */ > > Why not use a bit vector since we only need one bit of information. > Additionally we can use a single SPRG at that point instead to keep > track of the LRU information. Sounds interesting. I am just learning my first steps in powerpc-assembly, so please forgive if this is a little inefficient still. I'll try again next week. Greetings, -- David Jander Protonic Holland. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev