American Megatrends MegaRAC M300V, User Manual

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70 MegaRAC® M300V Card Implementer’s Reference and User’s Guide
Local Access Lock Out
The motherboard may provide hardware circuitry for locking out local access to the system for the
purpose of providing security in a server farm environment. Using this recommended but optional
feature, the MegaRAC M300V card may be commanded remotely to lock out some or all local
console access to its host. Lock out, if implemented, should disable local access to front panel
reset, power and NMI switches as a minimum. It is recommended that this capability also be used
to lock out local access to PS2/USB keyboard and PS2/USB mouse.
Local lock out should not restrict remote access to these interfaces. In other words, when locally
locked out, the remote system operator should still be able to assert system RESET, POWER and
NMI signals through the MegaRAC M300V card. Also, remote lock out has no affect on the
ability to use remote human interface devices such as remote serial console and KVMoIP
interfaces. It also has no effect on virtual, USB-based mass storage devices. Only local access is
disallowed.
OPMA provides the MCARD_LOCAL_LOCK_L signal for this purpose. When this signal is
activated by the MegaRAC M300V card, local access as previously described is disallowed.
Partial Circuit Example for Local Access Lock Out