i386/119913: VIA CPU mis-detected in kernel

[Michael Proto]

>Number:         119913
>Category:       i386
>Synopsis:       VIA CPU mis-detected in kernel
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jan 23 05:30:00 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Michael Proto
>Release:        FreeBSD 6.3-RELEASE i386
>Organization:
>Environment:
System: FreeBSD socrates.localnet 6.3-RELEASE FreeBSD 6.3-RELEASE #8: Mon Jan 21 00:42:19 EST 2008 root at socrates.localnet:/usr/obj/usr/src/sys/SOCRATES i386



>Description:
	I have a VIA Esther CPU that is not being properly detected by the
kernel.

Upon boot of GENERIC, I see the following for my CPU:

CPU: VIA/IDT Unknown (1200.01-MHz 686-class CPU)
  Origin = "CentaurHauls"  Id = 0x6d0  Stepping = 0
  Features=0xa7c9baff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,APIC,SEP,MTRR,PGE,CMOV,PAT,CLFLUSH,ACPI,MMX,FXSR,SSE,SSE2,TM,PBE>
  Features2=0x4181<SSE3,EST,TM2,xTPR>

This should be a VIA Esther CPU. By applying the following patch the CPU is
correctly detected:

CPU: VIA C7 Esther+RNG+AES+AES-CTR+SHA1+SHA256+RSA (1200.01-MHz 686-class CPU)
  Origin = "CentaurHauls"  Id = 0x6d0  Stepping = 0
  Features=0xa7c9baff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,APIC,SEP,MTRR,PGE,CMOV,PAT,CLFLUSH,ACPI,MMX,FXSR,SSE,SSE2,TM,PBE>
  Features2=0x4181<SSE3,EST,TM2,xTPR>

>How-To-Repeat:
	Boot GENERIC on this CPU, purchased as a soldiered-on component of
the Jetway J7F4K1G2E motherboard from e-itx.com

>Fix:

	Apply the following patch:

--- sys/i386/i386/identcpu.c.old        2008-01-04 03:44:43.000000000 -0500
+++ sys/i386/i386/identcpu.c    2008-01-01 10:34:25.000000000 -0500
@@ -564,6 +564,8 @@
                        goto via_common;
                case 0x6a0:
                        strcpy(cpu_model, "VIA C7 Esther");
+               case 0x6d0:
+                       strcpy(cpu_model, "VIA C7 Esther");
 via_common:
                        do_cpuid(0xc0000000, regs);
                        i = regs[0];



>Release-Note:
>Audit-Trail:
>Unformatted: