
Non Volatile
Memory Type
Amount (Size) Does this
memory store
customer data?
Does this
memory retain
data when
power is
removed?
What is the
purpose of this
memory?
How is data
input into this
memory?
How is this
memory write
protected?
render the NIC
nonfunctional.
Keyboard ROM 64 KBytes (not
customer
accessible)
No Yes Stores firmware
code (keyboard,
mouse, &
battery
management).
Programmed at
the factory.
Code is updated
when the system
BIOS is updated.
A utility is
required for
writing data to
this memory and
is available on
the HP website.
Writing data to
this ROM in an
inappropriate
manner can
render the PC
nonfunctional.
DIMM Serial
Presence Detect
(SPD)
configuration
data
256 Bytes per
memory
module, 128
Bytes
programmable
(not customer
accessible)
No Yes Stores memory
module
information.
Programmed by
the memory
vendor.
Data cannot be
written to this
memory when
the module is
installed in a PC.
The specific
write protection
method varies
by memory
vendor.
System BIOS 4 to 5 MBytes Yes Yes Store system
BIOS code and
PC configuration
data.
System BIOS
code is
programmed at
the factory.
Code is updated
when the system
BIOS is updated.
Configuration
data and
settings are
input using the
F10 setup utility
or a custom
utility.
A utility is
required for
writing data to
this memory and
is available on
the HP website.
Writing data to
this ROM in an
inappropriate
manner can
render the PC
nonfunctional.
Intel
Management
Engine Firmware
(present only in
models ending in
a ‘p’ or ‘w’ or
with Intel
Centrino Pro
technology)
1.5 or 5 MBytes Yes Yes Stores
Management
Engine Code,
Settings,
Provisioning
Data and iAMT
third party data
store.
Management
Engine Code is
programmed at
the factory.
Code is updated
via Intel secure
firmware update
utility. Unique
Provisioning
Data can be
entered at the
factory or by an
administrator
using the
Management
Engine (MEBx)
setup utility. The
The Intel chipset
is configured to
enforce
hardware
protection to
block all direct
read/write
access to this
area. An Intel
utility is required
for updating the
firmware. Only
firmware
updates digitally
signed by Intel
can be applied
using this utility.
58 Chapter 8 Statement of Volatility
Comentarios a estos manuales