Non-Volatile Memory Usage - HP EliteBook 820 G1 Maintenance And Service Manual

Non-volatile memory usage

Non Volatile
Memory
Type
HP Sure Start
flash (select
models only)
Real Time Clock
(RTC) battery
backed-up
CMOS
configuration
memory
(CMOS)
Controller (NIC)
EEPROM
ENWW
Amount Does this
(Size) memory
store
customer
data?
2 MB No
256 Bytes No
64 KBytes (not No
customer
accessible)
Does this What is the
memory purpose of
retain data this
when power memory?
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 172.
Yes Stores system
date and time
and limited
keyboard
controller data.
Yes Store NIC
configuration
and NIC
firmware.
How is data How is this
input into memory
this write
memory? protected?
Data cannot be This memory is
written to this protected by the
device via the HP Sure Start
host processor. Embedded
The content is Controller.
managed solely
by the HP Sure
Start Embedded
Controller.
Using the F10 This memory is
Setup utility or not write-
changing the protected. HP
Microsoft recommends
Windows date password
and time. protecting the
F10
utility.
Using a utility A utility is
from the NIC required to
vendor that can write data to
be run from this memory
DOS. and is available
from NIC
vendor. Writing
data to this
ROM in an
inappropriate
manner will
render the NIC
nonfunctional.
Non-volatile memory usage
Setup
167