Dell PowerEdge 7250, User Manual

Page: 85 / 102

Terminal Mode Commands
83
Boot flags
(semi-volatile)
(continued)
5 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 operating
system 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.
001b = Requests BIOS to force mux to
BMC at conclusion of
POST/start of operating system-boot. If honored, this overrides the
recommended setting of the mux at the end of POST.
010b = Requests BIOS to force mux to
system at conclusion of
POST/start of operating system-boot. If honored, this overrides the
recommended setting of the mux at the end of POST.
Data 5 - Reserved.
Table C-5. Boot Option Parameters
(continued)
Parameter Number Parameter Data (non-volatile unless otherwise noted)