HP Stream 11-r000 Maintenance and Service Guide - Page 82

Non-volatile memory usage, Statement of Volatility

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Non-volatile memory usage Non Volatile Memory Type Amount (Size) Real Time Clock (RTC) battery backed-up CMOS configuration memory (CMOS) 256 Bytes Does this memory store customer data? Does this memory retain data when power is removed? No Yes Controller (NIC) 64 KBytes (not No Yes EEPROM customer accessible) Keyboard ROM 64 KBytes (not No Yes customer accessible) DIMM Serial 256 Bytes per No Yes Presence Detect memory (SPD) module, 128 configuration Bytes data programmable (not customer accessible) System BIOS 4 to 5 MBytes Yes Yes What How is data is the purpose input into of this memory? this memory? How is this memory write protected? Stores system date and time and limited keyboard controller data. Using the F10 Setup utility or changing the Mic rosoft Windows date and time. This memory is not writeprotected. HP recommends password protecting the F 10 Setup utility. Store NIC configuration and NIC firmware. 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 nonfunctional. 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 websit e. Writing data to this ROM in an inappropriate manner can render the PC nonfunctional. Stores memory module information. Programmed by the memory vendor. Data cannot be written to this memory when the modul e is installed in a PC. The specific write protection method varies by memory vendor. 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 A utility is required for writing data to this memory and is available on the HP websit e. Writing data to this ROM in an inappropriate manner can 74 Chapter 10 Statement of Volatility

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Non-volatile 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?
Real Time Clock
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
256 Bytes
No
Yes
Stores system
date and time
and limited
keyboard
controller data.
Using the
F10
Setup utility or
changing the Mic
rosoft
Windows date
and time.
This memory
is not write-
protected.
HP recommends
password
protecting the
F
10
Setup utility.
Controller (NIC)
EEPROM
64 KBytes (not
customer
accessible)
No
Yes
Store NIC
configuration
and NIC
firmware.
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
nonfunctional.
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 websit
e. Writing data
to this ROM in an
inappropriate
manner can
render the PC
nonfunctional.
DIMM Serial
Presence Detect
(SPD)
configuration
data
256 Bytes per
memory
module, 128
Bytes
programmable
(not customer
accessible)
No
Yes
Stores memory
module
information.
Programmed
by the memory
vendor.
Data cannot be
written to
this memory
when the modul
e 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
A utility
is required for
writing data to
this memory
and is available
on the HP websit
e. Writing data
to this ROM in an
inappropriate
manner can
74
Chapter 10
Statement of Volatility