On Thu, 2007-10-11 at 09:12 -0500, Kumar Gala wrote: > On Oct 11, 2007, at 6:46 AM, Paul Mackerras wrote: > > > In testing the new clocksource and clockevent code on a PPC601 > > processor, I discovered that the clockevent multiplier value for the > > decrementer clockevent was overflowing. Because the RTCL register in > > the 601 effectively counts at 1GHz (it doesn't actually, but it > > increases by 128 every 128ns), and the shift value was 32, that meant > > the multiplier value had to be 2^32, which won't fit in an unsigned > > long on 32-bit. The same problem would arise on any platform where > > the timebase frequency was 1GHz or more (not that we actually have any > > such machines today). > > do you still have a 601 running somewhere?
On my desk :-) (and he also has a 601 card for the 7500 iirc) /me remembers to revive his dual 604 8500 one of these days. Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
