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Overview of BIOS Features—Crystal Forest
•
If both the supervisor and user passwords are set, users can enter either the
supervisor password or the user password to access Setup. Users have access to
Setup respective to which password is entered.
•
Setting the user password restricts who can boot the computer. The password
prompt is displayed before the computer is booted. If only the supervisor
password is set, the computer boots without asking for a password. If both
passwords are set, the user can enter either password to boot the computer.
•
For enhanced security, use different passwords for the supervisor and user
passwords.
•
Valid password characters are A–Z, a–z, and 0–9. Passwords may be up to 16
characters in length.
3.7
Boot Flow
When booting from a Global Reset, the PCH SPI controller will look for a descriptor
signature on the SPI flash device on Chip Select 0 starting at address 0x10 (for the
PCH B0 Silicon). The descriptor fetch is triggered by either the assertion of MEPWROK
or de-assertion of LAN_RST#; whichever occurs first. If the signature is present and
valid, the PCH will boot in Descriptor Mode which is a requirement of the CRB. It will
load up the descriptor into corresponding registers within the PCH.
With a valid descriptor, the PCH will look to the BBS0 and BBS1 (Boot BIOS
Destination straps) to determine if BIOS is to be booted from SPI flash (default boot
destination on the CRB).
Once the BIOS destination is determined, the PCH will determine the location of BIOS
on the SPI device through the base address that is defined in the SPI flash descriptor.
October 2012
Order No.: 328009-001US
®
®
Intel
Xeon
Processor E3-1125C with Intel
®
Communications Chipset 8910 Development Kit
User Guide
35
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