159
Parameter # Parameter Data (non-volatile unless otherwise noted)
OS
-
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
OS-boot. If honored, this overrides the recommended setting of the mux
at the end of POST.
Data 5
- Reserved
Boot initiator
info
(semi-volatile)
[1]
6 Address & Identity information for the party that initiated the boot. The party that
initiates the boot writes this parameter and the boot info acknowledge parameter
prior to issuing the command that causes the system power up, power cycle, or
reset. This data is written by the remote console application, not the BMC.
Boot Source
Data 1
- Channel Number. Channel that delivers the boot command (e.g. chassis
control). BIOS and boot software (e.g. service partition or OS loader) can
use the Get Channel Sessions to find out information about the party that
initiated the boot
[7:4] - Reserved
[3:0] - Channel Number
Data 2:5
- Session ID. Session ID for session that the boot command will be
issued over. This value can be used with the Get Channel Sessions
command to find out information about the party that initiated the boot
Data 6:9
- Boot Info Timestamp. This timestamp is used to help software
determine whether the boot information is stale. A service partition or
OS loader may elect to ignore the boot information if it is older than
expected
The boot initiator should load this field with the timestamp value from the
IPMI Get SEL Time command prior to issuing the command that initiates
the boot.
Boot initiator
mailbox
(semi-volatile)
[1][2
7 This parameter is used as a mailbox for holding information that directs the
operation of the OS loader or service partition software.
Note: Since this information is retained by the BMC and may be readable by
other software entities, care should be taken to avoid using it to carry secret data.
Data1:
Set Selector = Block selector
Selects which 16-byte info block to access. 0-based.
Data 2: (17) Block data
The first three bytes of block #0 are required to be an IANA Enterprise ID Number
(least significant byte first) for the company or organization that has specified the
loader.
Up to 16-bytes per block of information regarding boot initiator, based on protocol
and medium.
The BMC supports five blocks of storage for this command. Previous values are
overwritten. The BMC does not automatically clear any remaining data bytes if
fewer than 16 bytes are written to a given block.
All other
parameters
All
Others
Reserved
1. The designation ‘semi-volatile’ means that the parameter will be kept across system power cycles, resets, system
power on/off, and sleep state changes, but is not preserved if the management controller loses standby power or is
cold reset. Parameters designated as semi-volatile are initialized to 0s upon controller power up or hard reset, unless
otherwise specified.
5. IPMI allows software to use the boot initiator mailbox as a way for a remote application to pass OEM parameters for
additional selection of the boot process and direction of the startup of post-boot software. If additional parameters are
not included, the system boots the primary/first-scanned device of the type specified.
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