HP ProDesk 600 G4 Micro Maintenance and Service Guide - Page 121

Nonvolatile memory usage, by the HP Sure Start

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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 board, (SPD) configuration 128 Bytes data programmable (not customer accessible) System BIOS 9 MBytes Yes 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 writeprotected? 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 solely Embedded Controller. critical System by the HP Sure Start BIOS code, EC Embedded Controller. firmware, and critical PC configuration data for select platforms that support HP Sure Start. For more information, see Using HP Sure Start on page 116. 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 and 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 board the memory vendor. this memory when the information. board is installed in a PC. 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 PC configuration Code is updated when the inappropriate manner can data. system BIOS is updated. render the PC non- 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, and select your country. Select Drivers & Downloads, and then Nonvolatile memory usage 113

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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 PC
configuration
data for select
platforms that
support HP Sure
Start.
For more
information, see
Using HP Sure
Start
on page
116
.
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 and 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 board,
128 Bytes
programmable
(not customer
accessible)
No
Yes
Stores memory
board
information.
DIMM SPD is programmed by
the memory vendor.
Data cannot be written to
this memory when the
board is installed in a PC.
The specific write-
protection method varies
by memory vendor.
System BIOS
9 MBytes
Yes
Yes
Stores 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.
NOTE:
Writing data to
this ROM in an
inappropriate manner can
render the PC non-
functional.
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
Nonvolatile memory usage
113