According to Kanoj Sarcar ...
>
> On my 8cpu, 4node machine, I can now disable arbitrary cpus, so that
> the kernel comes up with anywhere between 1 to 8 cpus. I haven't run
> a kernel compile in this configuration though. Neither have I tried
> disabling cpu A on nasid 0 (as a special case).
>
> I did shoot myself in the foot though by disabling node boards that
> were the only routes to the console port via the baseio board (prom
> appears to be a little stupid about this). I will have to pull boards
The prom does try a lot to find the user a good console. But if the
hw config is such that *no* node board can talk to a baseio it
then fails. Probably your console turned up on a baseio that did
not have the cable connected. The master cpu is selected based on
the fact that it has a connection to a baseio.
Every origin module is shipped with a baseio by default. So if
all modules have a baseio intact and if either node board N1 or
N3 is available and enabled, the console will be available on one of
them.
Conditions for no console are that all modules except 1 have baseio.
N1 and N3 on this module are disabled etc.
Thanks
srinivasa
> around tomorrow to get the machine back up.
>
> Feel free to try enabling/disabling cpus (take care not to render
> your system unbootable though).
>
> Kanoj
>
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