Nonvolatile Memory - HP ProOne 490 G3 Maintenance And Service Manual

Nonvolatile memory

Nonvolatile
memory type
HP Sure Start
flash (select
models only)
Real Time Clock
(RTC) battery
backed-up CMOS
configuration
memory
Controller (NIC)
EEPROM
DIMM Serial
Presence Detect
(SPD)
configuration
data
92 Appendix B Statement of memory volatility
Amount (size) Does this
memory store
customer data?
2-megabytes No
256-bytes No
64-kilobytes No
(not customer
accessible)
256-bytes per No
memory
module, 128-
bytes
programmable
(not customer
accessible)
Does this What is
memory retain the purpose of
data when this memory?
power is
removed?
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 (select
models only)
on page 96.
Yes Stores system
date and time
and noncritical
data.
Yes Stores NIC
configuration
and
NIC firmware.
Yes Stores memory
module
information.
How is data How is this
input into this memory write-
memory? protected?
Data cannot be This memory is
written to this protected by
device via the HP Sure
the host Start Embedded
processor. The Controller.
content is
managed solely
by the HP Sure
Start Embedded
Controller.
RTC battery This memory is
backed-up CMOS not write-
is programmed protected.
using
the Computer
Setup (BIOS), or
changing
the Microsoft
Windows date
and time.
NIC EEPROM is A utility is
programmed required to write
using a utility data to this
from the NIC memory and is
vendor that can available from
be run from DOS. the NIC vendor.
Writing data to
this ROM in an
inappropriate
manner will
render the NIC
non-functional.
DIMM SPD is Data cannot be
programmed by written to this
the memory memory when
vendor. the module is
installed in a
computer. The
specific write-
protection
method varies
by
memory vendor.