System BIOS
SE7500CW2 Server Board Technical Product Specification
42
Revision 1.40
6.3.3.3
BIOS Recommendations
To be PXE 2.1-compliant the BIOS should implement the following:
•
POST Memory Manager Specification
v1.01 or later is strongly recommended. PMM
provides a straightforward way for LAN on Motherboard PXE implementations to move
their ROM image from UMB to extended memory. While methods to do this exist outside
of PMM, their use is undefined and unreliable. Placing PXE ROM images into UMB space
reduces the available UMB space by approximately 32 KB. This is sufficient to
compromise or even prevent successful operation of some downloaded programs
The SE7500CW2 server board is compliant with PXE 2.1. It implements the
Post Memory
Manager Specification v1.01.
6.3.4
Console Redirection
The BIOS supports redirection of both video and keyboard via a serial link (COM 1 or COM 2).
When console redirection is enabled, the local (host server) keyboard input and video output are
passed both to the local keyboard and video connections, and to the remote console via the
serial link. Keyboard inputs from both sources are valid and video is displayed to both outputs.
As an option, the system can be operated without a keyboard or monitor attached to the host
system and run entirely from the remote console. Setup and any other text-based utilities can be
accessed through console redirection.
6.3.4.1
Operation
When redirecting the console through a modem as opposed to a null modem cable, the modem
needs to be configured with the following:
•
Auto-answer (for example, ATS0=2, to answer after two rings).
•
Modem reaction to DTR set to return to command state (e.g., AT&D1). Failure to provide
this results in the modem either dropping the link when the server reboots (as in AT&D0)
or becoming unresponsive to server baud rate changes (as in AT&D2).
•
The BIOS Setup option for handshaking must be set to CTS.
Console redirection is exclusive with Logo display which is determined by the configuration
menu “Boot-time Diagnostic Screen”, When “Boot time Diagnostic Screen” is enabled, the
Console redirection is enabled. On the contrary, when the “Boot time Diagnostic Screen” is
disabled, the console re-direction is disabled and the logo screen is used instead.
6.3.4.2
Keystroke Mappings
Phoenix* based BIOS uses a serial port interrupt to send the Video RAM data to remote
console and receive the remote input. When the data is received from the remote site by serial
port, it will be put into the KB buffer by int16 to simulate it comes from the local KB by INT9.
