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.
Created attachment 144494 [details] diff of proposed change
I have now been using the above fix for about a week. It appears to have resolved the problem. Is there any additional information or testing required?
Created attachment 146184 [details] Updated patch for 1386 and amd64 You didn't include path information in your patch, which is sort of lucky because there are actually 2 machdep.c files that have to be updated. This makes me wonder if we should be adding MacBookPro4,1 to the list.
Created attachment 146748 [details] Add in Macbookpro4,1
I think the patch is ready, but I would like someone to confirm (perhaps Ed)?
The patch looks fine to me.
A commit references this bug: Author: pfg Date: Fri Sep 5 01:06:45 UTC 2014 New revision: 271149 URL: http://svnweb.freebsd.org/changeset/base/271149 Log: Apply known workarounds for modern MacBooks. The legacy USB circuit tends to give trouble on MacBook. While the original report covered MacBook, extend the fix preemptively for the newer MacBookPro too. PR: 191693 Reviewed by: emaste MFC after: 5 days Changes: head/sys/amd64/amd64/machdep.c head/sys/i386/i386/machdep.c
A commit references this bug: Author: pfg Date: Sat Sep 13 18:27:47 UTC 2014 New revision: 271541 URL: http://svnweb.freebsd.org/changeset/base/271541 Log: MFC r271149: Apply known workarounds for less modern MacBooks. The legacy USB circuit tends to give trouble on older MacBooks. While the original report covered MacBook4, extend the fix preemptively for the newer MacBookPro4 too. PR: 191693 Reviewed by: emaste Approved by: re Changes: _U stable/10/ stable/10/sys/amd64/amd64/machdep.c stable/10/sys/i386/i386/machdep.c
A commit references this bug: Author: pfg Date: Sat Sep 13 18:34:57 UTC 2014 New revision: 271542 URL: http://svnweb.freebsd.org/changeset/base/271542 Log: MFC r271149: Apply known workarounds for less modern MacBooks. The legacy USB circuit tends to give trouble on older MacBooks. While the original report covered MacBook4, extend the fix preemptively for the newer MacBookPro4 too. PR: 191693 Reviewed by: emaste Changes: _U stable/9/sys/ stable/9/sys/amd64/amd64/machdep.c stable/9/sys/i386/i386/machdep.c
Committed and merged back to stable/9. Change will be in 10.1 Release. Thank you for your report and contribution!