On Wed, Oct 17, 2007 at 06:03:35PM +0100, Maciej W. Rozycki wrote: > > The two things are a know lose end. There is a bug in some old MIPS > > processors where reading one of the compare or count registers in exactly > > the moment when both have identical values in the interrupt getting lost. > > > > Will have to dig up the details on that one again before I can implement > > a proper workaround ... > > This is the erratum #53 of the R4000PC/SC processor and it triggers if > the Count register is read. Conveniently, in the errata sheet as > distributed, the text is covered by a figure (Figure 1a on page 13), so > you can only reach the page with some PostScript magic. I did it a while > ago and now have a separate document available which provides the text of > page 13 with the figure removed. I can provide it if there is interest. Ah. I noticed there was something like white writing on white background matching when I searched the PDF for keywords. So I guess it would be nice if somebody could regenerate a PS or PDF file. I also seem to be missing information on the later R4400 versions. Ralf
