On 05/27/2014 09:58 PM, Thomas Gleixner wrote: > ce4100 is an oddball though. The ioapic is registered way before the > interrupt subsystem is initialized and I have a hard time to > understand that comment: > > /* We can't set this earlier, because we need to calibrate the timer */ > legacy_pic = &null_legacy_pic; > > The timer calibration happens after the interrupts are set up. I > assume it's check_timer() which wants that, but we know exactly how > the ce4100 works, so we might be able to avoid that whole "testing" > stuff. Sebastian, any input on this? According to my memory there was some PIC init we need but I don't recall the details. However, booting the system with "legacy_pic = &null_legacy_pic;" in x86_ce4100_early_setup() gives me this: [ 0.001000] Enabling APIC mode: Flat. Using 2 I/O APICs [ 0.001000] leaving PIC mode, enabling APIC mode. [ 0.001000] enabled ExtINT on CPU#0 [ 0.001000] ENABLING IO-APIC IRQs [ 0.001000] Setting 1 in the phys_id_present_map [ 0.001000] ...changing IO-APIC physical APIC ID to 1 ... ok. [ 0.001000] Setting 2 in the phys_id_present_map [ 0.001000] ...changing IO-APIC physical APIC ID to 2 ... ok. [ 0.001000] smpboot: CPU0: Intel(R) Atom(TM) CPU CE4150 @ 1.20GHz (fam: 06, model: 1c, stepping: 0a) [ 0.001000] Using local APIC timer interrupts. [ 0.001000] calibrating APIC timer ... and we stand still. With the assignment as it is now: [ 0.001000] Enabling APIC mode: Flat. Using 2 I/O APICs [ 0.001000] leaving PIC mode, enabling APIC mode. [ 0.001000] enabled ExtINT on CPU#0 [ 0.002312] ENABLING IO-APIC IRQs [ 0.003009] Setting 1 in the phys_id_present_map [ 0.004007] ...changing IO-APIC physical APIC ID to 1 ... ok. [ 0.005533] Setting 2 in the phys_id_present_map [ 0.006006] ...changing IO-APIC physical APIC ID to 2 ... ok. [ 0.008373] ..TIMER: vector=0x30 apic1=-1 pin1=-1 apic2=-1 pin2=-1 [ 0.009000] ...trying to set up timer as Virtual Wire IRQ... [ 0.019490] ..... works. [ 0.020005] smpboot: CPU0: Intel(R) Atom(TM) CPU CE4150 @ 1.20GHz (fam: 06, model: 1c, stepping: 0a) [ 0.024005] Using local APIC timer interrupts. [ 0.024005] calibrating APIC timer ... [ 0.026000] ... lapic delta = 624992 [ 0.026000] ... PM-Timer delta = 0 [ 0.026000] ..... delta 624992 [ 0.026000] ..... mult: 26843202 [ 0.026000] ..... calibration result: 99998 [ 0.026000] ..... CPU clock speed is 1199.0984 MHz. [ 0.026000] ..... host bus clock speed is 99.0998 MHz. [ 0.026000] ... verify APIC timer [ 0.128565] ... jiffies delta = 100 [ 0.129004] ... jiffies result ok and it goes on. As you see, "..TIMER:" is missing in the upper output. > > Thanks, > > tglx Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
