>>>>> "ralf" == Ralf Baechle <ralf@linux-mips.org> writes: ralf> On Thu, Apr 03, 2003 at 04:11:02PM +0200, Maciej W. Rozycki wrote: >> Hmm, erratum #2 is about status output pins. I suppose you mean erratum >> #5. But then it applies to V3.0, too. >> >> Then the bit is r/w, so how about toggling it instead of panicking? >> With an informational message like: >> >> printk(KERN_ERR "Firmware bug: 32-byte I-cache line size unsupported for >> the R4000...\n"); >> printk(KERN_ERR "... fixing up to 16-byte size.\n"); >> >> Of course that probably requires a temporary cache inhibition and >> invalidation. ralf> I know of one machine where changing the size of the cacheline is supposed ralf> not to work, that's the MIPS Magnum 4000 and it's close relatives. ralf> Anyway, I put the check there for the unlikely case there are broken ralf> systems out there. In practice I assume vendors were aware of this ralf> problem and the check is purely theoretical and for paranoid correctness's ralf> sake. ralf> It seems like changing the configuration to larger cache lines where ralf> possible should improve performance somewhat. If all the cache code is ralf> working truly correct we also should no longer see VCE exceptions on ralf> R4000SC processors - the reason why Indys are still a valuable test tool. I still got lot of them :( VCED exceptions : 1544376 VCEI exceptions : 92380 That machine was booted yesterday night. I haven't login on it, i.e. only normal daemons for a nfsrooted machine running. Later, Juan. -- In theory, practice and theory are the same, but in practice they are different -- Larry McVoy
