HP Chromebook 11-2100 Maintenance and Service Guide - Page 62

Nonvolatile memory usage

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Nonvolatile memory usage Non Volatile Memory Type HP Sure Start flash (select models only) Amount (Size) Does this memory store customer data? 2 MBytes No Real Time Clock (RTC) battery backed-up CMOS configuration memory (CMOS) Controller (NIC) EEPROM 256 bytes No 64 KBytes No (not customer accessible) DIMM Serial 256 bytes per No Presence Detect memory (SPD) module, 128 configuration data bytes programmabl e (not customer accessible) System BIOS 4 to 5 MBytes Yes Intel Management 1.5 MBytes or Yes Engine Firmware 5 MBytes (present in only Does this memory retain data when power is removed? What is the How is data input into this purpose of 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 PC configuration data for select platforms that support HP Sure Start. 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 Store 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 NIC firmware. DOS. 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 PC. The specific write- protection method varies by memory vendor. Yes Store system System BIOS code is A utility is required for BIOS code and programmed at the factory. writing data to this PC Code is updated when the memory and is available configuration system BIOS is updated. on the HP website; go to data. Configuration data and http://www.hp.com/ settings are input using the support, and select your Computer Setup (BIOS) or a country. Select Drivers & custom utility. Downloads, and then follow the on-screen instructions. NOTE: Writing data to this ROM in an inappropriate manner can render the PC nonfunctional. Yes Stores Management Engine Code is The Intel chipset is Management programmed at the factory. configured to enforce Engine Code, Code is updated via Intel hardware protection to 56 Chapter 7 Statement of memory volatility

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Nonvolatile memory usage
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?
HP Sure Start
flash (select
models only)
2 MBytes
No
Yes
Provides
protected
backup of
critical System
BIOS code, EC
firmware, and
critical PC
configuration
data for select
platforms that
support HP
Sure Start.
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 (CMOS)
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
Store 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 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
programmabl
e (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
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
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
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.
Intel Management
Engine Firmware
(present in only
1.5 MBytes or
5 MBytes
Yes
Yes
Stores
Management
Engine Code,
Management Engine Code is
programmed at the factory.
Code is updated via Intel
The Intel chipset is
configured to enforce
hardware protection to
56
Chapter 7
Statement of memory volatility