Non-Volatile Memory Usage - HP EliteBook 740 G1 Maintenance And Service Manual

Non-volatile memory usage

Non Volatile Amount
Memory Type (Size)
Real Time Clock 256 Bytes
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
Controller (NIC) 64 Kbytes
EEPROM (not customer
accessible)
Keyboard ROM 64 Kbytes
(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 or 5MByte
Engine Firmware
(present only in
models ending in a
'p' or 'w' or with
Intel Centrino Pro
technology)
Does this Does this
memory memory
store retain data
customer when power
data? is removed?
No Yes
No Yes
No Yes
No Yes
Yes Yes
Yes Yes
What is the How is data input into this
purpose of this memory?
memory?
Stores system Using the F10 Setup utility or
date and time changing the Microsoft®
and limited Windows® date & time.
keyboard
controller data.
Store NIC Using a utility from the NIC
configuration vendor that can be run from
and NIC DOS.
firmware.
Stores firmware Programmed at the factory.
code (keyboard, Code is updated when the
mouse, & system BIOS is updated.
battery
management).
Stores memory Programmed by the memory
module 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
F10 setup utility 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
populated by a remote
management console or local
applications registered by an
How is this memory write
protected?
This memory is not write-
protected. HP
recommends password
protecting the F10 Setup
utility.
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.
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 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. Writing
data to this ROM in an
inappropriate manner can
render the PC non-
functional.
The Intel chipset is
configured to enforce HW
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.
Non-volatile memory usage 145