Nonvolatile Memory Usage - HP VR Backpack G2 Maintenance And Service Manual

Nonvolatile memory usage

Table 12-1 Troubleshooting steps for nonvolatile memory usage
Nonvolatile
Memory Type Amount (Size)
Real Time Clock 256 bytes
(RTC) battery
backed-up CMOS
configuration
memory
Controller (NIC) 64 KB (not
EEPROM customer
accessible)
DIMM Serial 256 bytes per
Presence Detect memory
(SPD) module, 128
configuration data bytes
programmable
(not customer
accessible)
System BIOS 9 MB
Intel Management 1.5 MB or 7 MB
Engine Firmware
(present only in
select Elite or Z
models. For more
information, go to
http://www.hp.com/
support. Select
Find your
product, and then
follow the on-
screen
instructions.)
Does this Does this
memory memory
store retain data
customer when power
data? is removed?
No Yes
No Yes
No Yes
Yes Yes
Yes Yes
What is the
purpose of this How is data input into this
memory? memory?
Stores system RTC battery backed-up CMOS
date and time is programmed using
and noncritical Computer Setup (BIOS), or by
data. changing the Microsoft®
Windows date & time.
Stores NIC NIC EEPROM is programmed
configuration using a utility from the NIC
and NIC vendor that can be run from
firmware. DOS.
Stores memory DIMM SPD is programmed by
module the memory vendor.
information.
Stores system System BIOS code is
BIOS code and programmed at the factory.
computer Code is updated when the
configuration system BIOS is updated.
data. Configuration data and
settings are input using the
Computer Setup (BIOS) or a
custom utility.
Stores Management Engine Code is
Management programmed at the factory.
Engine Code, Code is updated via Intel
Settings, secure firmware update
Provisioning utility. Unique Provisioning
Data and iAMT Data can be entered at the
third-party data factory or by an
store. administrator using the
Management Engine (MEBx)
setup utility. The third party
data store contents can be
populated by a remote
management console or local
applications that have been
registered by an
How is this memory
write-protected?
This memory is not write-
protected.
A utility must be used 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.
Data cannot be written to
this memory when the
module is installed in a
computer. The specific
write-protection method
varies by memory vendor.
NOTE: Writing data to
this ROM in an
inappropriate manner can
render the computer non-
functional.
A utility must be used for
writing data to this
memory and is available
on the HP website; go to
http://www.hp.com/
support. Select Find your
product, and then follow
the on-screen
instructions.
The Intel chipset is
configured to enforce
hardware protection to
block all direct read/write
access to this area. An
Intel utility must be used
for updating the
firmware. Only firmware
updates digitally signed
by Intel can be applied
using this utility.
Nonvolatile memory usage 53