HP Carrier-grade cc3300 Intel Server Management (ISM) Installation and User&am - Page 91

:0] - BIOS Mux Control Override

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Parameter # Boot flags 5 (semivolatile) a (continued) Parameter Data (nonvolatile 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 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 OSboot. 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 OSboot. If honored, this overrides the recommended setting of the mux at the end of POST. (See IPMI specification for more info.) Data 5 - Reserved

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Parameter
#
Parameter Data (nonvolatile unless otherwise noted)
Boot flags
(semi-
volatile)
a
(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 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