689
AM
3
r
2
Six
Core
Processor
May
Limit
P-State
When
Core
C
6
State
Is
Disabled
Description
If
system
software
disables
core
C
6
state
(
CC
6)
on
an
AMD
FX
™
6100
Six-Core
Processor
,
OPN
FD
6100
WMW
6
KGU
,
the
application
power
management
(
APM
)
incorrectly
limits
the
processor
P-state
to
a
low
performing
P-state
.
Refer
to
the
BIOS
and
Kernel
Developer's
Guide
(
BKDG
)
for
AMD
Family
15
h
Models
00
h-
0
Fh
Processors
,
order
# 42301
section
"Core
C
6 (
CC
6)
State"
for
the
conditions
under
which
CC
6
state
is
disabled
.
Potential
Effect
on
System
None
expected
under
normal
circumstances
,
as
AMD
recommends
that
CC
6
is
enabled
in
all
systems
.
In
the
event
that
the
system
software
implements
an
option
to
disable
CC
6,
the
system
may
experience
low
performance
in
this
mode
.
Suggested
Workaround
AMD
recommends
that
CC
6
is
enabled
.
This
erratum
does
not
apply
in
this
case
and
no
workaround
is
necessary
.
In
the
event
that
system
software
disables
CC
6,
disable
APM
using
Core
Performance
Boost
Control
Register
[
ApmMasterEn
] (
D
18
F
4
x
15
C
[7]) = 0
b
.
To
avoid
unnecessarily
disabling
APM
on
unaffected
parts
,
the
following
conditions
should
be
met
before
implementing
this
workaround
:
•
CC
6
is
disabled
.
•
CPUID
Fn
8000_0001_
EBX
[31:28] (
BrandID
Identifier
[
PkgType
]) = 0001
b
(
AM
3
r
2
package
type
).
•
CPUID
Fn
8000_0008_
ECX
[
NC
] (
APIC
ID
Size
and
Core
Count
[
Number
of
Physical
Cores
]) = 5.
•
D
18
F
4
x
150[7:0] = 6
Bh
.
•
D
18
F
4
x
10
C
[11:0] (
TDP
Limit
2
Register
[
NodeTdpLimit
]) = 130
h
.
Fix
Planned
Yes
48063
Rev
. 3.18
October
2012
Revision
Guide
for
AMD
Family
15
h
Models
00
h-
0
Fh
Processors
Product
Errata
63