The NUPowr G3 upgrades for the PDS slot are working without any problems in Linux. They worked with MkLinux and as Raylynn wrote his own one is also working with the monolithic Linux kernel.
So I think the Linux kernel will use the CPU that actually performs the jump into the kernel code. And it seems that the NUPowr PDS card remains active when the BootX bootstrap enters the supervisor mode in the 68k emulation (and by that trick also gets into PPC supervisor mode) while with the Sonnet card(s) this procedure reactivates the 601 CPU. > Von: Daniel Gimpelevich <[EMAIL PROTECTED]> > Antworten an: nubus-pmac-users@lists.sourceforge.net > Datum: Wed, 08 Feb 2006 10:53:12 -0800 > An: nubus-pmac-users@lists.sourceforge.net > Betreff: [Nubus-pmac-users] CPU Upgrades & Linux (was Re: Re: Yellow Dog on PM > 7100) > > On Wed, 08 Feb 2006 17:32:48 +0100, Tobias Netzel wrote: > >> As far as I know there is not yet a way the Crescendo can be made to >> work in Linux. >> Also, knowing the right L2CR won't help since the kernel does not use >> the G3 CPU and so cannot set it's L2 cache. >> In order to solve this problem the bootloader is the point that has to >> be patched as the kernel obviously is started with the 601 CPU active. >> The bootloader seems to reactivate the 601 (or somehow deactivate the >> G3) before jumping into the kernel code. >> One needs to find out at which point that happens and then find a >> workaround. >> >> @Daniel: >> As you are the expert in terms of miboot - what's your opinion? > > These facts are not limited to NuBus machines. The same problem occurs in > any Mac with a stock CPU that cannot be removed, where the upgrade > involves adding a card rather than replacing the existing CPU, and AFAIK, > the problem occurs with any bootloader. Choosing a CPU from among more > than one available is the Linux kernel's job, and evidently the support is > not there for such upgrades as Level 2 Cache Card-based ones for PCI > machines (e.g., the Crescendo/L2), PCI Card-based ones (e.g. the > Crescendo/7200), PDS Card-based ones (e.g. the Crescendo/NuBus), nor > PDS/Cache card-based ones (e.g. the Turbo601). > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 > _______________________________________________ > Nubus-pmac-users mailing list > Nubus-pmac-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/nubus-pmac-users ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 _______________________________________________ Nubus-pmac-users mailing list Nubus-pmac-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nubus-pmac-users
