HP 787801-251 Datasheet download pdf (Page 158)

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?

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 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.

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 non-

functional.

Intel Management

Engine Firmware

(present only in

models ending in a

‘p’,‘w’, or ‘m’ or

with Intel Centrino

Pro technology)

1.5 or 5MByte 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 third

party data store contents can

populated by a remote

management console or local

applications registered by an

administrator to have access

to the space.

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.

Bluetooth flash 2Mbit No Yes Stores

Bluetooth

configuration

and firmware.

Programmed at the factory.

Tools for writing data to this

memory are not publicly

available but can be obtained

from the silicon vendor.

A utility is required for

writing data to this

memory and is made

available through newer

versions of the driver if

the flash requires an

upgrade.

802.11 WLAN

EEPROM

4kb to 8kb No Yes Stores

configuration

and calibration

data.

Programmed at the factory.

Tools for writing data to this

memory are not made public.

A utility is required for

writing data to this

memory and is typically

not made available to the

public unless a firmware

upgrade is necessary to

address a unique issue.

150 Chapter 10 Statement of Volatility

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