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Table 8-1
Troubleshooting steps for nonvolatile memory usage (continued)
Nonvolatile
Amount (Size)
memory type
DIMM Serial
256 bytes per
Presence Detect
memory
(SPD)
module, 128
configuration
bytes
data
programmable
(not customer
accessible)
System BIOS
9 MB
Intel
1.5 MB or 7 MB
Management
Engine
Firmware
(present only in
select Elite or Z
models. For
more
information, go
to
http://www.hp.com/support. Select
Identify your
product for
manuals and
specific product
information,
and then follow
the on-screen
instructions.)
Bluetooth flash
2 megabits
(select products
only)
Does this
Does this
What is the
memory
memory
purpose of
store
retain data
this memory?
customer
when
data?
power is
removed?
No
Yes
Stores
memory
module
information.
Yes
Yes
Stores system
BIOS code and
computer
configuration
data.
Yes
Yes
Stores
Management
Engine Code,
Settings,
Provisioning
Data and
iAMT third-
party data
store.
No
Yes
Stores
Bluetooth
configuration
and firmware.
How is data entered into
How is this memory
this memory?
write-protected?
DIMM SPD is programmed
Data cannot be written
by the memory vendor.
to this memory when
the module is installed
in a computer.
The specific write-
protection method
varies by memory
vendor.
System BIOS code is
NOTE:
programmed at the
to this ROM in an
factory. Code is updated
inappropriate manner
when the system BIOS
can render the
is updated. Configuration
computer
data and settings are
nonfunctional.
entered using the
A utility must be used
Computer Setup (BIOS) or
for writing data to this
a custom utility.
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.
Management Engine Code
The Intel chipset is
is programmed at the
configured to enforce
factory. Code is updated
hardware protection to
via Intel secure firmware
block all direct read-
update utility. Unique
write access to this
Provisioning Data can be
area. An Intel utility
entered at the factory
must be used for
or by an administrator
updating the firmware.
using the Management
Only firmware updates
Engine (MEBx) setup
digitally signed by Intel
utility. The third-party
can be applied using
data store contents can
this utility.
be populated by a remote
management console or
local applications that
have been registered by
an administrator to have
access to the space.
Bluetooth flash is
A utility must be used
programmed at the
for writing data to this
factory. Tools for writing
memory and is made
data to this memory are
available through
not publicly available but
newer versions of
can be obtained from the
the driver whenever
silicon vendor.
the flash requires an
upgrade.
Nonvolatile memory usage
Writing data
57
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