744
Processor
CC
6
May
Not
Restore
Trap
Registers
Description
Following
a
core
C
6 (
CC
6)
power
state
transition
,
the
processor
core
may
not
restore
the
following
registers
:
•
MSRC
001_0053,
IO
Trap
Register
3
•
MSRC
001_0052,
IO
Trap
Register
2
•
MSRC
001_0051,
IO
Trap
Register
1
•
MSRC
001_0050,
IO
Trap
Register
0
Instead
,
the
registers
are
set
to
zero
when
the
processor
resumes
from
CC
6
state
.
This
erratum
only
applies
on
processor
models
that
have
a
single
core
per
compute-unit
(
Compute
Unit
Status
Register
[
DualCore
],
D
18
F
5
x
80[16]
is
0
b
).
Potential
Effect
on
System
The
processor
may
not
observe
debug
traps
after
the
processor
has
entered
and
exited
CC
6
mode
.
Suggested
Workaround
BIOS
should
not
use
these
trap
registers
.
Fix
Planned
No
fix
planned
Revision
Guide
for
AMD
Family
15
h
Models
00
h-
0
Fh
Processors
48063
Rev
. 3.18
October
2012
88
Product
Errata