HP EliteBook 1040 Maintenance and Service Guide - Page 82

Nonvolatile memory usage

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Nonvolatile memory usage Nonvolatile Memory Type Amount (Size) HP Sure Start flash 8 MBytes (select models only) Does this memory store customer data? No Real Time Clock 256 Bytes No (RTC) battery backed-up CMOS configuration memory Controller (NIC) EEPROM 64 KBytes (not No customer accessible) DIMM Serial 256 Bytes per No Presence Detect memory (SPD) module, 128 configuration data Bytes programmable (not customer accessible) System BIOS 9 MBytes Yes Does this memory retain data when power is removed? What is the purpose of this How is data input into this memory? memory? How is this memory write-protected? Yes Provides Data cannot be written to this This memory is protected protected device via the host processor. by the HP Sure Start backup of The content is managed Embedded Controller. critical System solely by the HP Sure Start BIOS code, EC Embedded Controller. firmware, and critical computer configuration data for select platforms that support HP Sure Start. For more information, see Using HP Sure Start (select models only) on page 77. Yes Stores system RTC battery backed-up CMOS This memory is not write- date and time is programmed using the protected. and noncritical Computer Setup (BIOS), or data. changing the Microsoft Windows date & time. Yes Stores NIC NIC EEPROM is programmed A utility is required to configuration using a utility from the NIC write data to this memory and NIC vendor that can be run from and is available from the firmware. DOS. NIC vendor. Writing data to this ROM in an inappropriate manner will render the NIC non- functional. Yes Stores memory DIMM SPD is programmed by Data cannot be written to module the memory vendor. this memory when the information. module is installed in a computer. The specific write-protection method varies by memory vendor. Yes Stores system System BIOS code is NOTE: Writing data to BIOS code and programmed at the factory. this ROM in an computer Code is updated when the inappropriate manner can configuration system BIOS is updated. render the computer non- data. Configuration data and functional. settings are input using the Computer Setup (BIOS) or a custom utility. A utility is required for writing data to this memory and is available on the HP website; go to http://www.hp.com/ support. Select Find your 74 Chapter 11 Statement of memory volatility

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Nonvolatile memory usage
Nonvolatile
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?
HP Sure Start
flash
(select models
only)
8 MBytes
No
Yes
Provides
protected
backup of
critical System
BIOS code, EC
firmware,
and
critical
computer
configuration
data for select
platforms that
support HP
Sure Start.
For more
information,
see
Using HP
Sure Start
(select models
only)
on page
77
.
Data cannot be written to this
device via the host processor.
The content is managed
solely by the HP Sure Start
Embedded Controller.
This memory is protected
by the HP Sure Start
Embedded Controller.
Real Time Clock
(RTC) battery
backed-up CMOS
configuration
memory
256 Bytes
No
Yes
Stores system
date and time
and noncritical
data.
RTC battery backed-up CMOS
is programmed using the
Computer Setup (BIOS), or
changing the Microsoft
Windows date & time.
This memory is not write-
protected.
Controller (NIC)
EEPROM
64 KBytes (not
customer
accessible)
No
Yes
Stores NIC
configuration
and NIC
firmware.
NIC EEPROM is programmed
using a utility from the NIC
vendor that can be run from
DOS.
A utility is required to
write data to this memory
and is available from the
NIC vendor. Writing data
to this ROM in an
inappropriate manner will
render the NIC non-
functional.
DIMM Serial
Presence Detect
(SPD)
configuration
data
256 Bytes per
memory
module, 128
Bytes
programmable
(not customer
accessible)
No
Yes
Stores memory
module
information.
DIMM SPD is programmed by
the memory vendor.
Data cannot be written to
this memory when the
module is installed in a
computer. The
specific
write-protection method
varies by memory vendor.
System BIOS
9 MBytes
Yes
Yes
Stores system
BIOS code and
computer
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
Computer Setup (BIOS) or a
custom utility.
NOTE:
Writing data to
this ROM in an
inappropriate manner can
render the computer non-
functional.
A utility is required for
writing data to this
memory and is available
on the HP website; go to
support
. Select
Find your
74
Chapter 11
Statement of memory volatility