MacBook users: possible fix for the SMP problem

[Rui Paulo]

On Nov 12, 2007 6:51 PM, John Baldwin <jhb at freebsd.org> wrote:
>
> On Friday 09 November 2007 06:40:48 am Rui Paulo wrote:
> > On 7 Nov 2007, at 21:48, Scott Long wrote:
> >
> > > Rui Paulo wrote:
> > >> On Nov 7, 2007 7:50 PM, Maxim Sobolev <sobomax at freebsd.org> wrote:
> > >>> I don't really like the fact that it has to be turned on manually.
> > >>> Is it
> > >>> possible to make this automatic based on BIOS Id or something like
> > >>> this?
> > >> Yes, I can turn this on for MacBooks.
> > >
> > > Yeah, at least have it on by default for the systems that we know have
> > > the problem.  I still think that it needs wider application, but as
> > > long
> > > as the immediate and identifiable issue is addressed, I'm happy.
> >
> >
> > Ok, if there are no objections, I plan to request approval from my
> > mentor and from re@ for the following patch:
> >
> > Index: clock.c
> > ===================================================================
> > RCS file: /home/ncvs/src/sys/i386/isa/clock.c,v
> > retrieving revision 1.240
> > diff -u -p -r1.240 clock.c
> > --- clock.c   26 Oct 2007 03:23:54 -0000      1.240
> > +++ clock.c   9 Nov 2007 11:34:56 -0000
> > @@ -130,6 +130,9 @@ static    u_char  rtc_statusb = RTCSB_24HR;
> >   #define     ACQUIRED        2
> >   #define     ACQUIRE_PENDING 3
> >
> > +/* Intel ICH register */
> > +#define ICH_PMBASE   0x400
> > +
> >   static      u_char  timer2_state;
> >
> >   static      unsigned i8254_get_timecount(struct timecounter *tc);
> > @@ -616,11 +619,31 @@ i8254_init(void)
> >   void
> >   startrtclock()
> >   {
> > +     char *ichenv, *sysenv;
> >       u_int delta, freq;
> >
> >       writertc(RTC_STATUSA, rtc_statusa);
> >       writertc(RTC_STATUSB, RTCSB_24HR);
> >
> > +     /*
> > +      * On some systems, namely MacBooks, we need to disallow the
> > +      * legacy USB circuit to generate an SMI# because this can
> > +      * cause several problems, namely: incorrect CPU frequency
> > +      * detection and failure to start the APs.
> > +      */
> > +     ichenv = getenv("hw.ich.disable_legacy_usb");
> > +     sysenv = getenv("smbios.system.product");
> > +     if ((ichenv !=  NULL) || (sysenv != NULL &&
> > +         strncmp(sysenv, "MacBook", 7) == 0)) {
> > +             if (bootverbose)
> > +                     printf("Disabling LEGACY_USB_EN bit on Intel ICH.\n");
> > +             outl(ICH_PMBASE + 0x30, inl(ICH_PMBASE + 0x30) & ~0x8);
> > +             if (ichenv)
> > +                     freeenv(ichenv);
> > +             if (sysenv)
> > +                     freeenv(sysenv);
> > +     }
> > +
>
> This is missing a freeenv(sysenv) in the case that ichenv is NULL and
> sysenv != "MacBook".  Perhaps move the freeenv()'s out of the if statement.

Yeah, Nate already pointed that out. Could you check your inbox,
please? Nate asked you if this was the proper place to add this code.

Regards.
-- 
Rui Paulo