IBM RS/6000 7024 E Series, Руководство по обслуживанию, Страница: 111 / 162

Power On Password
When the system is powered on, it will check whether a Power-On password is
present. If there is one present, and unattended start mode (see “Unattended Start
Mode” on page 6-7) is not set, the owner has specified that the system cannot be
used unless the Power-On password is supplied. The system prompts for the
Power-On password. The user is given three attempts to enter the password. If the
user fails to supply the password, the system will go to a hang state and must be
powered off before continuing.
Privileged Utilities Password
If a user wants to boot, change or remove the Privileged-Access password, or use
any of the other “Privileged” utilities, the system will check whether a Privileged
Access password exists. If it does, the user is prompted to either enter the
Privileged Access password. The user is given three tries to supply the correct
password. If the user fails to do so, the system will go to a hang state and must be
powered off before continuing.
Unattended Start Mode
If Unattended Start Mode is enabled, the system will boot from the defined boot
device without requiring any input from the user. The keyboard controller will be
programmed to lock up until the Power-On password is entered.
Firmware Flash Update Design
The firmware flash update can be performed in normal mode and recovery mode.
The type of update mode will determine what portions of the flash code is updated,
whether the update is done "quietly" (no messages), and whether the original VPD
information is merged into the new image before updating.
The default is a "normal" update, where the firmware flash update is performed from
the System Management Services Menu. Messages and errors are communicated
through the menu pop-up interface. The system user selects the Update Firmware
option, and the composite image is loaded using the default file name and default
media. The original system VPD information is merged in before the image is
programmed. Only the sectors containing the composite image are programmed;
those containing the recovery block are considered "read-only".
A "recovery" update, is executed automatically when a bad composite image is
detected during early system initialization. Most messages and errors are
suppressed; fatal errors are displayed in a serial interface compatible format. The
default file name and default flash update media is assumed. The selected media
Chapter 6. Firmware
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