Startup IPI (was: Re: test13-pre3)
Quoted 7 lines · Alan Cox
Quoted 5 lines
Yeah. Just do not read video memory when another CPU starts. I'll try disabling cache on both CPUs, maybe it will make some difference, as secondary CPU should start with caches disabled. But maybe that it is just broken AGP bus, and nothing else. But until I find what's really broken on my hardware, I'd like to leave 'udelay(300)' in.
In the case where it boots does it also report mismatched MTRRs ??
Yes, it complains. But BIOS correctly reports x1/x2 depending on number of CPUs I plug into motherboard, so I believe that it did some initialization before it start loading OS.
calibrating APIC timer ...
..... CPU clock speed is 797.0452 MHz.
..... host bus clock speed is 99.6305 MHz.
cpu: 0, clocks: 996305, slice: 332101 CPU0<T0:996304,T1:664192,D:11,S:332101,C:996305>
cpu: 1, clocks: 996305, slice: 332101 CPU1<T0:996304,T1:332096,D:6,S:332101,C:996305> checking TSC synchronization across CPUs: passed. Setting commenced=1, go go go
mtrr: your CPUs had inconsistent variable MTRR settings
mtrr: probably your BIOS does not setup all CPUs
Best regards,
Petr Vandrovec [email protected]
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Quoted 5 lines
Quoted 1 line
In the case where it boots does it also report mismatched MTRRs ??
Yes, it complains. But BIOS correctly reports x1/x2 depending on number of CPUs I plug into motherboard, so I believe that it did some initialization before it start loading OS.
That may explain the hangs. Intel docs don't seem to guarantee what happens if the MTRRs don't match across CPU's.
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