HP Dragonfly Folio 13.5 Maintenance and Service Guide - Page 102

Secure Boot and created Custom Secure Boot Keys, disabling Secure Boot does not clear the keys.

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Like the legacy BIOS, the UEFI BIOS provides an interface to display the system information and configuration settings and to change the configuration of your computer before an OS is loaded. BIOS provides a secure runtime environment that supports a Graphic User Interface (GUI). In this environment, you can use either a pointing device (touch screen, touchpad, pointing stick, or USB mouse) or the keyboard to navigate and make menu and configuration selections. The UEFI BIOS also contains basic system diagnostics. The UEFI BIOS provides functionality beyond that of the legacy BIOS. In addition, the UEFI BIOS works to initialize the computer's hardware before loading and executing the OS; the runtime environment allows the loading and execution of software programs from storage devices to provide more functionality, such as advanced hardware diagnostics (with the ability to display more detailed system information) and advanced firmware management and recovery software. HP has provided options in Computer Setup (BIOS) to allow you to run in legacy BIOS, if required by the operating system. Examples of this requirement would be if you upgrade or downgrade the OS. 3. Where is the UEFI BIOS located? The UEFI BIOS is located on a flash memory chip. You must use a utility to write to the chip. 4. What kind of configuration data is stored on the DIMM Serial Presence Detect (SPD) memory module? How would this data be written? The DIMM SPD memory contains information about the memory module, such as size, serial number, data width, speed and timing, voltage, and thermal information. This information is written by the module manufacturer and stored on an EEPROM. You cannot write to this EEPROM when the memory module is installed in a computer. Third-party tools do exist that can write to the EEPROM when the memory module is not installed in a computer. Various third-party tools are available to read SPD memory. 5. What is meant by "Restore the nonvolatile memory found in Intel-based system boards"? This message relates to clearing the Real Time Clock (RTC) CMOS memory that contains computer configuration data. 6. How can the BIOS security be reset to factory defaults and erase the data? IMPORTANT: Resetting results in the loss of information. These steps do not reset Custom Secure Boot Keys. See question and answer 7 for information about resetting the keys. a. Turn on or restart the computer, and then quickly press esc. b. Select Main, and then select Reset Security to Factory Defaults. c. Follow the on-screen instructions. d. Select Main, select Save Changes and Exit, and then follow the on-screen instructions. 7. How can the Custom Secure Boot Keys be reset? Secure Boot is a feature to ensure that only authenticated code can start on a platform. If you enabled Secure Boot and created Custom Secure Boot Keys, disabling Secure Boot does not clear the keys. You must also select to clear the Custom Secure Boot Keys. Use the same Secure Boot access procedure that you used to create the Custom Secure Boot Keys, but select to clear or delete all Secure Boot Keys. a. Turn on or restart the computer, and then quickly press esc. 96 Chapter 10 Statement of memory volatility

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Like the legacy BIOS, the UEFI BIOS provides an interface to display the system information and
configuration settings and to change the configuration of your computer before an OS is loaded. BIOS
provides a secure runtime environment that supports a Graphic User Interface (GUI). In this environment,
you can use either a pointing device (touch screen, touchpad, pointing stick, or USB mouse) or the
keyboard to navigate and make menu and configuration selections. The UEFI BIOS also contains basic
system diagnostics.
The UEFI BIOS provides functionality beyond that of the legacy BIOS. In addition, the UEFI BIOS works to
initialize the computer’s hardware before loading and executing the OS; the runtime environment allows
the loading and execution of software programs from storage devices to provide more functionality, such
as advanced hardware diagnostics (with the ability to display more detailed system information) and
advanced firmware management and recovery software.
HP has provided options in Computer Setup (BIOS) to allow you to run in legacy BIOS, if required by the
operating system. Examples of this requirement would be if you upgrade or downgrade the OS.
3.
Where is the UEFI BIOS located?
The UEFI BIOS is located on a flash memory chip. You must use a utility to write to the chip.
4.
What kind of configuration data is stored on the DIMM Serial Presence Detect (SPD) memory module? How
would this data be written?
The DIMM SPD memory contains information about the memory module, such as size, serial number, data
width, speed and timing, voltage, and thermal information. This information is written by the module
manufacturer and stored on an EEPROM. You cannot write to this EEPROM when the memory module
is installed in a computer. Third-party tools do exist that can write to the EEPROM when the memory
module is not installed in a computer. Various third-party tools are available to read SPD memory.
5.
What is meant by “Restore the nonvolatile memory found in Intel-based system boards”?
This message relates to clearing the Real Time Clock (RTC) CMOS memory that contains computer
configuration data.
6.
How can the BIOS security be reset to factory defaults and erase the data?
IMPORTANT:
Resetting results in the loss of information.
These steps do not reset Custom Secure Boot Keys. See question and answer 7 for information about
resetting the keys.
a.
Turn on or restart the computer, and then quickly press
esc
.
b.
Select
Main
, and then select
Reset Security to Factory Defaults
.
c.
Follow the on-screen instructions.
d.
Select
Main
, select
Save Changes and Exit
, and then follow the on-screen instructions.
7.
How can the Custom Secure Boot Keys be reset?
Secure Boot is a feature to ensure that only authenticated code can start on a platform. If you enabled
Secure Boot and created Custom Secure Boot Keys, disabling Secure Boot does not clear the keys. You
must also select to clear the Custom Secure Boot Keys. Use the same Secure Boot access procedure that
you used to create the Custom Secure Boot Keys, but select to clear or delete all Secure Boot Keys.
a.
Turn on or restart the computer, and then quickly press
esc
.
96
Chapter 10
Statement of memory volatility