HP ZBook 17 G2 Maintenance And Service Manual page 154

Non Volatile Amount (Size) Does this
Memory Type
Real Time Clock 256 bytes
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
Controller (NIC) 64 KBytes
EEPROM (not customer
accessible)
DIMM Serial 256 bytes per
Presence Detect memory
(SPD) module, 128
configuration data bytes
programmabl
e (not
customer
accessible)
System BIOS 4 to 5 MBytes
Intel Management 1.5 MBytes or
Engine Firmware 5 MBytes
(present in only
specific ZBook and
EliteBook models.
For more
information, go to
http://www.hp.com/
support, and
select your
country. Select
142 Chapter 14 Statement of memory volatility
Does this
memory memory
store retain data
customer when power
data? is removed?
No Yes
No Yes
No Yes
Yes Yes
Yes Yes
What is the How is data input into this
purpose of this memory?
memory?
firmware, and
critical PC
configuration
data for select
platforms that
support HP
Sure Start.
Stores system RTC battery backed-up CMOS
date and time is programmed using the
and noncritical Computer Setup (BIOS), or
data. changing the Microsoft
Windows date & time.
Store NIC NIC EEPROM is programmed
configuration using a utility from the NIC
and NIC vendor that can be run from
firmware. DOS.
Stores memory DIMM SPD is programmed by
module the memory vendor.
information.
Store system System BIOS code is
BIOS code and programmed at the factory.
PC Code is updated when the
configuration system BIOS is updated.
data. Configuration data and
settings are input using the
Computer Setup (BIOS) or a
custom utility.
Stores Management Engine Code is
Management programmed at the factory.
Engine Code, Code is updated via Intel
Settings, secure firmware update
Provisioning utility. Unique Provisioning
Data and iAMT Data can be entered at the
third-party data factory or by an administrator
store. using the Management Engine
(MEBx) setup utility. The third
party data store contents can
be populated by a remote
How is this memory write
protected?
This memory is not write-
protected.
A utility is required to
write data to this memory
and is available from NIC
vendor. Writing data to
this ROM in an
inappropriate manner will
render the NIC non-
functional.
Data cannot be written to
this memory when the
module is installed in a
PC. The specific write-
protection method varies
by memory vendor.
A utility is required for
writing data to this
memory and is available
on the HP website; go to
http://www.hp.com/
support, and select your
country. Select Drivers &
Downloads, and then
follow the on-screen
instructions.
NOTE: Writing data to
this ROM in an
inappropriate manner can
render the PC non-
functional.
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.