Hi David, On Tue, 19 May 2026 at 10:55, David Laight <[email protected]> wrote: > The company I used to work for used 4 NIOS II inside an fpga. > The instruction timing for one is pretty critical, it has some code that > has to complete in 122 clocks (worst case). > Our solution was to spend a few man-weeks writing a compatible cpu! > I think it came out with fewer pipeline stalls (in particular it 'lost' > the one for a (predicted) taken branch). > The maximum clock frequency might be lower; but it is ok at 62.5MHz and the > higher 125MHz in just impossible for all sorts of reasons. > > OTOH I really wouldn't run Linux on it!
Sounds similar to what CoreSemi is doing with J2 (nommu, also for predictable latency), but their products do run Linux. See the video from the LPC session at https://lpc.events/event/19/contributions/2097/ Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected] In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
