Date: Mon, 05 Nov 2007 15:24:35 +0200 From: Ian FREISLICH <ianf@clue.co.za> To: Rui Paulo <rpaulo@fnop.net> Cc: freebsd-current@FreeBSD.org, freebsd-hardware@FreeBSD.org Subject: Re: MacBook users: possible fix for the SMP problem Message-ID: <E1Ip1wR-0000Ik-W4@clue.co.za> In-Reply-To: Message from Rui Paulo <rpaulo@fnop.net> of "Sun, 04 Nov 2007 20:59:28 GMT." <4A5A9C78-22AC-4480-BDEB-A72F6CF472DB@fnop.net>
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Rui Paulo wrote:
> Hi,
> I've been contacted by Marco Trillo and I think he has found the
> source of the SMP problem.
> The problem seems to rely on Intel ICH7. Basically we need to disable
> the "LEGACY_USB" bit before we calibrate the clocks.
> "LEGACY_USB", according to Marco (I don't have the ICH7 spec at hand),
> "causes legacy USB circuit to generate SMIs".
>
> Please try the following patch:
> --- sys/amd64/isa/clock.c.orig 2007-11-04 20:31:09.000000000 +0000
> +++ sys/amd64/isa/clock.c 2007-11-04 20:34:59.000000000 +0000
> @@ -577,6 +577,8 @@ startrtclock()
> writertc(RTC_STATUSA, rtc_statusa);
> writertc(RTC_STATUSB, RTCSB_24HR);
>
> + outl(0x430, inl(0x430) & ~0x8);
> +
> freq = calibrate_clocks();
> #ifdef CLK_CALIBRATION_LOOP
> if (bootverbose) {
> --- sys/i386/isa/clock.c.orig 2007-11-04 20:34:03.000000000 +0000
> +++ sys/i386/isa/clock.c 2007-11-04 20:34:30.000000000 +0000
> @@ -621,6 +621,8 @@ startrtclock()
> writertc(RTC_STATUSA, rtc_statusa);
> writertc(RTC_STATUSB, RTCSB_24HR);
>
> + outl(0x430, inl(0x430) & ~0x8);
> +
> freq = calibrate_clocks();
> #ifdef CLK_CALIBRATION_LOOP
> if (bootverbose) {
>
>
> This should probably fix two issues:
> 1) The second core should start without any trick (e.g. key press)
> 2) We should be able to run with HZ=1000 (the default) without any
> problem. To check if this is indeed the case, try booting with HZ=1000
> (loader.conf variable kern.hz) and check if your CPU clock shows up
> correctly in the dmesg. After that, please also check if 'time sleep
> 1' takes one second (not more and not less).
This indeed fixes the Mc Time problem I was experiencing. How nice
not to have to attend the boot :) Now I can power on and turn my
attention to the coffee machine first thing in the morning. Thanks!
> Also, please test if there are any USB problems.
No USB problems that I can tell.
Ian
--
Ian Freislich
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