12-05-2012
You can "always" update the hmc because it knows about old firmware. You should NEVER update firmware before updating the HMC
Note:there are combinations of firmware and HMC that are not supported. That does not mean it will not work long enough for you to apply a firmware update.
Reasoning is simple. The are possible features in new firmware that old HMC code does not know, so cannot support. Sometimes there are changes made to data structures in PHYP such that the HMC cannot communicate with managed system, or could even corrupt HMC presentation of the system with new firmware.
Thus, always update HMC first.
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LEARN ABOUT MOJAVE
firmwarepasswd
FIRMWAREPASSWD(8) BSD System Manager's Manual FIRMWAREPASSWD(8)
NAME
firmwarepasswd -- tool for setting and removing firmware passwords on a system
SYNOPSIS
firmwarepasswd [-setpasswd] [-setmode mode] [-mode] [-check] [-delete] [-verify] [-unlockseed] [-h]
DESCRIPTION
The firmwarepasswd command is used to add or remove firmware passwords from a system as well as check status and other options. The
firmwarepasswd command requires root privileges to run.
A list of flags and their descriptions:
-setpasswd
Prompts to add a new firmware password or change and existing password if one exists.
-setmode mode
Set the mode to "command" or "full". "Command" will prompt for the firmware password if the user attempts to boot from a different
volume. "Full" will prompt on every startup (not recommended).
-mode Displays the current mode if one is set.
-check Displays whether or not a firmware password is set.
-delete
Prompts for password and clears both password and the mode if correct.
-verify
Prompts for password and displays success if correct.
-unlockseed
Generates a firmware password recovery key. Note: Machine must be stable for this command to generate a valid seed. No pending
changes that need a restart. NOTE: Seed is only valid until the next time a firmware password command runs.
-h Displays a list of all the commands available in the firmwarepasswd tool, with explanatory information.
FILES
/usr/sbin/firmwarepasswd
OS X
April 9, 2014 OS X