HP t740 Hardware Reference Guide - Page 40

Diagnostics and troubleshooting, Lights

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You can run the BIOS executable with or without the USB storage device. If the system does not have a USB storage device installed, the BIOS update performs under the Microsoft Windows environment, and followed by system reboot. Linux BIOS Flashing All BIOS flashing under ThinPro 6.x and later uses tool-less BIOS updates, in which the BIOS updates itself. Use the following comments to flash a Linux® BIOS: ● hptc-bios-flash ImageName Prepares the system to update the BIOS during the next restart. This command automatically copies the files into the correct location and prompts you to restart the thin client. This command requires that the tool-less update option in the BIOS settings is set to Auto. You can use hpt-bios-cfg to set the toolless update option in the BIOS. ● hptc-bios-flash -h Displays a list of options. BitLocker Drive Encryption/BIOS Measurements If you have Windows BitLocker Drive Encryption (BDE) enabled on your system, HP recommends that you temporarily suspend BDE before updating the BIOS. You should also obtain your BDE recovery password or recovery PIN before suspending BDE. After you flash the BIOS, you can resume BDE. To make a change to BDE, select Start > Control Panel > BitLocker Drive Encryption, click Suspend Protection or Resume Protection and then click Yes. As a general rule, updating the BIOS modifies measurement values stored in the Platform Configuration Registers (PCRs) of the system's security module. Temporarily disable technologies that use these PCR values to ascertain platform health (BDE is one such example) before flashing the BIOS. After you update the BIOS, re-enable the functions and restart the system so that you can take new measurements. BootBlock Emergency Recovery Mode In the event of a failed BIOS update (for example, if power is lost while updating), the System BIOS can become corrupted. BootBlock Emergency Recovery Mode detects this condition and automatically searches the root directory of the hard drive and any USB media sources for a compatible binary image. Copy the binary (.bin) file in the DOS Flash folder to the root of the storage device, and then power on the system. After the recovery process locates the binary image, it attempts the recovery process. The automatic recovery continues until it successfully restores or updates the BIOS. If the system has a BIOS Setup password, you might have to use the Startup Menu or Utilities submenu to flash the BIOS manually after providing the password. Sometimes there are restrictions on which BIOS versions may be installed on a platform. If the BIOS that was on the system had restrictions, then only allowable BIOS versions may be used for recovery. Diagnostics and troubleshooting Lights Table 4-8 Diagnostic and troubleshooting lights Light Status Power light off When the thin client is plugged into the wall socket and the power light is off, the thin client is powered off. However, the network can trigger a Wake On LAN event in order to perform management functions. Power light on Displays during boot sequence and while the thin client is on. During boot sequence, hardware initialization is processed and startup tests are performed on the following initializations: 34 Chapter 4 Troubleshooting

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You can run the BIOS executable with or without the USB storage device. If the system does not have a USB
storage device installed, the BIOS update performs under the Microsoft Windows environment, and followed
by system reboot.
Linux BIOS Flashing
All BIOS flashing under ThinPro 6.x and later uses tool-less BIOS updates, in which the BIOS updates itself.
Use the following comments to flash a Linux® BIOS:
●
hptc-bios-flash
ImageName
Prepares the system to update the BIOS during the next restart. This command automatically copies the
files into the correct location and prompts you to restart the thin client. This command requires that the
tool-less update option in the BIOS settings is set to Auto. You can use
hpt-bios-cfg
to set the tool-
less update option in the BIOS.
●
hptc-bios-flash –h
Displays a list of options.
BitLocker Drive Encryption/BIOS Measurements
If you have Windows BitLocker Drive Encryption (BDE) enabled on your system, HP recommends that you
temporarily suspend BDE before updating the BIOS. You should also obtain your BDE recovery password or
recovery PIN before suspending BDE. After you flash the BIOS, you can resume BDE.
To make a change to BDE, select
Start > Control Panel > BitLocker Drive Encryption
, click
Suspend
Protection
or
Resume Protection
and then click
Yes
.
As a general rule, updating the BIOS modifies measurement values stored in the Platform Configuration
Registers (PCRs) of the system's security module. Temporarily disable technologies that use these PCR values
to ascertain platform health (BDE is one such example) before flashing the BIOS. After you update the BIOS,
re-enable the functions and restart the system so that you can take new measurements.
BootBlock Emergency Recovery Mode
In the event of a failed BIOS update (for example, if power is lost while updating), the System BIOS can
become corrupted. BootBlock Emergency Recovery Mode detects this condition and automatically searches
the root directory of the hard drive and any USB media sources for a compatible binary image. Copy the binary
(.bin) file in the DOS Flash folder to the root of the storage device, and then power on the system. After the
recovery process locates the binary image, it attempts the recovery process. The automatic recovery
continues until it successfully restores or updates the BIOS. If the system has a BIOS Setup password, you
might have to use the Startup Menu or Utilities submenu to flash the BIOS manually after providing the
password. Sometimes there are restrictions on which BIOS versions may be installed on a platform. If the
BIOS that was on the system had restrictions, then only allowable BIOS versions may be used for recovery.
Diagnostics and troubleshooting
Lights
Table 4-8
Diagnostic and troubleshooting lights
Light
Status
Power light off
When the thin client is plugged into the wall socket and the power light is off, the thin client is powered
off. However, the network can trigger a Wake On LAN event in order to perform management functions.
Power light on
Displays during boot sequence and while the thin client is on. During boot sequence, hardware
initialization is processed and startup tests are performed on the following initializations:
34
Chapter 4
Troubleshooting