From owner-freebsd-ports  Tue Mar 27 14:10: 9 2001
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Date: Tue, 27 Mar 2001 14:10:06 -0800 (PST)
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From: natedac@kscable.com
Subject: Re: ports/25958: Xfree86's savage and vesa drivers%2
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The following reply was made to PR ports/25958; it has been noted by GNATS.

From: natedac@kscable.com
To: freebsd-gnats-submit@FreeBSD.org, natedac@kscable.com
Cc:  
Subject: Re: ports/25958: Xfree86's savage and vesa drivers%2
Date: Tue, 27 Mar 2001 16:02:52 -0600 (CST)

 Problem has been solved by a workaround in the kernel source.  Thanks to 
 the help of some of the guys on #BSDcode on EFnet (hi BigSpoon!).  
 Apparently MTRR doesn't work on this paricular processor, an AMD 550 MHz 
 Athlon, or the kernel is somehow detecting it wrong.  XFree86 
 4.4.x obviously is trying to use this feature somehow, and that was 
 causing a kernel panic.
 
 Temporary Workaround:
 
 At line 572 of /sys/i386/i386/i686_mem.c, comment out the commands that 
 attempt to detect the MTRR facility, like this:
 
 ---- snip ----
 
 static void
 i686_mem_drvinit(void *unused)
    
 {
 
     /* Try for i686 MTRRs */
 /*
     if ((cpu_feature & CPUID_MTRR) &&
         ((cpu_id & 0xf00) == 0x600) &&
         ((strcmp(cpu_vendor, "GenuineIntel") == 0) ||
         (strcmp(cpu_vendor, "AuthenticAMD") == 0))) {
         mem_range_softc.mr_op = &i686_mrops;
     }
   
 */
     
 } 
 

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