HP ProDesk 400 G4, Maintenance And Service Manual

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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
input into this
memory? How is this
memory write-
protected?
System BIOS 4-megabytes to
5-megabytes 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
input 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 is
required for
writing data to
this memory and
is available on
the HP website;
go to
http://www.hp.com/
support
, and
select your
country. Select
Drivers &
Downloads, and
then follow
the on-screen
instructions.
Intel
Management
Engine Firmware
(present in only
specific ZBook
and EliteBook
models. For
more
information, go
to
http://www.hp.com/
support
, and
select your
country. Select
Drivers &
Downloads, and
then follow
the on-screen
instructions.)
1.5-megabytes
or 5-megabytes 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 is required
for updating
the firmware.
Only firmware
updates digitally
signed by Intel
can be applied
using this utility.
Nonvolatile memory 115