Non-Volatile Memory Usage - HP Pavilion10 Maintenance And Service Manual

Non-volatile memory usage

Non Volatile
Memory Type
Real Time
Clock (RTC)
battery
backed-up
CMOS
configuration
memory
(CMOS)
Controller
(NIC)
EEPROM
Keyboard
ROM
DIMM Serial
Presence
Detect (SPD)
configuration
data
System BIOS
Intel
Management
Engine
Firmware
66 Chapter 10 Statement of Volatility
Amount Does this Does this
(Size) memory memory
store retain data
customer when power
data? is removed?
256 Bytes No Yes
64 Kbytes No Yes
(not
customer
accessible)
64 Kbytes No Yes
(not
customer
accessible)
256 Bytes No Yes
per
memory
module,
128 Bytes
programma
bl e (not
customer
accessible)
4 to 5 Yes Yes
MBytes
1.5 or Yes Yes
5MByte
What is the How is data input into
purpose of this memory?
this memory?
Stores Using the F10 Setup
system date utility or changing the
and time and Microsoft® Windows®
limited date & time.
keyboard
controller
data.
Store NIC Using a utility from the
configuration NIC vendor that can be
and NIC run from DOS.
firmware.
Stores Programmed at the
firmware factory. Code is updated
code when the system BIOS
(keyboard, is updated.
mouse, &
battery
management)
.
Stores Programmed by the
memory memory vendor.
module
information.
Store system System BIOS code is
BIOS code programmed at the
and PC factory. Code is updated
configuration when the system BIOS
data. is updated.
Configuration data and
settings are input using
the F10 setup utility or a
custom utility.
Stores Management Engine
Management Code is programmed at
Engine Code, the factory. Code is
Settings, updated via Intel secure
How is this memory
write protected?
This memory is not
write-protected. HP
recommends
password protecting
the F10 Setup utility.
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.
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
nonfunctional.
Data cannot be
written to this
memory when the
module is installed in
a PC. The specific
write protection
method varies by
memory vendor.
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
nonfunctional.
The Intel chipset is
configured to enforce
HW protection to
block all direct read/