HP Dragonfly Folio 13.5 Maintenance and Service Guide - Page 100

Statement of memory volatility, Table 10-1

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Table 10-1 Troubleshooting steps for nonvolatile memory usage (continued) Nonvolatile memory type Amount (Size) Does this memory store customer data? Does this memory retain data when power is removed? What is the How is data entered into purpose of this memory? this memory? How is this memory write-protected? DIMM Serial 256 bytes per No Yes Stores DIMM SPD is programmed Data cannot be written Presence Detect memory memory by the memory vendor. to this memory when (SPD) module, 128 module the module is installed configuration bytes information. in a computer. data programmable The specific write- (not customer protection method accessible) varies by memory vendor. System BIOS 9 MB Yes Yes Stores system System BIOS code is NOTE: Writing data BIOS code and programmed at the to this ROM in an computer factory. Code is updated inappropriate manner configuration when the system BIOS can render the data. is updated. Configuration computer data and settings are nonfunctional. entered using the Computer Setup (BIOS) or A utility must be used a custom utility. 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. Intel 1.5 MB or 7 MB Yes Yes Stores Management Engine Code The Intel chipset is Management Management is programmed at the configured to enforce Engine Engine Code, factory. Code is updated hardware protection to Firmware Settings, via Intel secure firmware block all direct read- (present only in Provisioning update utility. Unique write access to this select Elite or Z Data and Provisioning Data can be area. An Intel utility models. For iAMT third- entered at the factory must be used for more party data or by an administrator updating the firmware. information, go store. using the Management Only firmware updates to Engine (MEBx) setup digitally signed by Intel http://www.hp.com/ utility. The third-party can be applied using support. data store contents can this utility. be populated by a remote Select Identify management console or your product local applications that for manuals have been registered by and specific an administrator to have product access to the space. information, and then follow the on-screen instructions.) Bluetooth flash 2 megabits No Yes Stores Bluetooth flash is A utility must be used (select products Bluetooth programmed at the for writing data to this only) configuration factory. Tools for writing memory and is made and firmware. 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. 94 Chapter 10 Statement of memory volatility

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Table 10-1
Troubleshooting steps for nonvolatile memory usage
(continued)
Nonvolatile
memory type
Amount (Size)
Does this
memory
store
customer
data?
Does this
memory
retain data
when
power is
removed?
What is the
purpose of
this memory?
How is data entered into
this memory?
How is this memory
write-protected?
DIMM Serial
Presence Detect
(SPD)
configuration
data
256 bytes per
memory
module, 128
bytes
programmable
(not customer
accessible)
No
Yes
Stores
memory
module
information.
DIMM SPD is programmed
by the memory vendor.
Data cannot be written
to this memory when
the module is installed
in a computer.
The specific write-
protection method
varies by memory
vendor.
System BIOS
9 MB
Yes
Yes
Stores system
BIOS code and
computer
configuration
data.
System BIOS code is
programmed at the
factory. Code is updated
when the system BIOS
is updated. Configuration
data and settings are
entered using the
Computer Setup (BIOS) or
a custom utility.
NOTE:
Writing data
to this ROM in an
inappropriate manner
can render the
computer
nonfunctional.
A utility must be used
for writing data to this
memory and is
available on the HP
website; go to
support
. Select
Find
your product
, and then
follow the on-screen
instructions.
Intel
Management
Engine
Firmware
(present only in
select Elite or Z
models. For
more
information, go
to
support
.
Select
Identify
your product
for manuals
and specific
product
information
,
and then follow
the on-screen
instructions.)
1.5 MB or 7 MB
Yes
Yes
Stores
Management
Engine Code,
Settings,
Provisioning
Data and
iAMT third-
party data
store.
Management Engine Code
is programmed at the
factory. Code is updated
via Intel secure firmware
update utility. Unique
Provisioning Data can be
entered at the factory
or by an 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 administrator to have
access to the space.
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.
Bluetooth flash
(select products
only)
2 megabits
No
Yes
Stores
Bluetooth
configuration
and firmware.
Bluetooth flash is
programmed at the
factory. Tools for writing
data to this memory are
not publicly available but
can be obtained from the
silicon vendor.
A utility must be used
for writing data to this
memory and is made
available through
newer versions of
the driver whenever
the flash requires an
upgrade.
94
Chapter 10
Statement of memory volatility