American Megatrends MegaRAC M300V, Руководство пользователя

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72 MegaRAC® M300V Card Implementer’s Reference and User’s Guide
Management UART Signal Multiplexing
The system serial port connector may contain either BMC console traffic (for example, a
Command Line Interface) or host system console traffic (for example, BIOS setup screen).
Separate serial port connectors are not allowed for management traffic and the local system UART
traffic. When no MegaRAC M300V card is installed, the system UART must be automatically
routed to the system serial port connector.
In order for this to work with the BMCs on MegaRAC M300V card, serial port multiplexers are
required on the motherboard. See Chapter 6 for more detail. The motherboard’s system UART
TxD/RxD MUX must route these signals to the MegaRAC M300V card socket when
MCARD_DETECT_L is active. When MCARD_DETECT_L is inactive, the TxD/RxD signals
are routed to the system serial port connector. The motherboard’s UART handshake signal MUX
must route the UART handshake signals from the MegaRAC M300V card connector to the system
serial port connector when MCARD_AUX_SoL_CTRL_L is active. When
MCARD_AUX_SoL_CTRL_L is inactive, the system UART handshake signals are routed to the
system serial port connector.
Support for Dedicated Management LAN
The MegaRAC M300V card uses a dedicated management NIC. The motherboard must route the
MegaRAC M300V card dedicated management NIC signals to a dedicated management network
RJ-45 connector that is accessible by the end user. The designer must also provide means to block
off this RJ-45 connector in the event that the MegaRAC M300V card is installed that uses a shared
NIC configuration.
MCard Presence Detect and Interface ID Support
The motherboard must support mCard presence detection and IPMI interface identification by the
system BIOS. OPMA supports this using four signals: one for card presence detect
(MCARD_DETECT_L) and three (INTERFACE_ID0–INTERFACE_ID2) for the interface type
identifier. Refer to the appropriate sections of this specification for descriptions on these signals.