Intel SR870BN4 - Server Platform - 0 MB RAM Product Manual page 160

Table 30. Boot Option Parameters (continued)
Parameter #
Boot flags
5
[1]
(semi-volatile)
(continued)
160
Parameter Data (non-volatile unless otherwise noted)
Data 4
[7:4] - Reserved
[3] - BIOS Shared Mode Override
Can be used to request BIOS to temporarily place the channel into Shared
access mode.
Per the recommendations in the IPMI specification, 'Shared' access would
cause the baseboard serial controller to both remain enabled after POST/start
of OS boot, while also allowing the BMC to be accessible. This can be useful
when booting to an alternative device such as a Diagnostic Partition since it
means the partition can use the serial port but that communication with the
BMC can remain available if the partition software fails.
1b = Request BIOS to temporarily set the access mode for the channel
specified in parameter #6 to 'Shared'. This is typically accomplished by
sending a 'Set Channel Access' command to set the volatile access
mode setting in the BMC
0b = No request to BIOS to change present access mode setting
[2:0] - BIOS Mux Control Override
Can be used to request BIOS to force a particular setting of the serial/modem
mux at the conclusion of POST / start of OS boot. This override takes
precedence over the mux settings for the access mode even if the BIOS
Shared Mode Override is set.
000b = BIOS uses recommended setting of the mux at the end of POST (See
IPMI specification for more info)
001b = Requests BIOS to force mux to BMC at conclusion of POST/start of
-
OS boot. If honored, this overrides the recommended setting of the
mux at the end of POST (See IPMI specification for more info)
010b = Requests BIOS to force mux to system at conclusion of POST/start of
OS-boot. If honored, this overrides the recommended setting of the
mux at the end of POST. (See IPMI specification for more info)
Data 5 - Reserved
Intel® SR870BN4 Server System Product Guide
continued