[Bug 191693] New: Macboook 4,1 kernel panic on boot - with workaround and fix

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191693

            Bug ID: 191693
           Summary: Macboook 4,1 kernel panic on boot - with workaround
                    and fix
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: walker.aj325 at gmail.com

My macbook 4.1 panics on boot when SMP enabled. Setting the following in
loader.conf fixes the problem: " smbios.system.product="MacBook3,1" ". This is
an ugly work-around.

There is a high probability the following change to machdep.c will fix the
problem permanently:

    /*
     * On 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.
     * We do this by disabling a bit in the SMI_EN (SMI Control and
     * Enable register) of the Intel ICH LPC Interface Bridge. 
     */
    sysenv = getenv("smbios.system.product");
    if (sysenv != NULL) {
        if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
            strncmp(sysenv, "MacBook3,1", 10) == 0 ||
>		    strncmp(sysenv, "MacBook4,1", 10) == 0 ||
            strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
            strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
            strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
            strncmp(sysenv, "Macmini1,1", 10) == 0) {
            if (bootverbose)
                printf("Disabling LEGACY_USB_EN bit on "
                    "Intel ICH.\n");
            outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
        }
        freeenv(sysenv);
    }

Right now the loader.conf change is serving me just fine, but there may be a
few other potential users affected by this bug.

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