3.11.1. LPC
The LPC interface is the main communication channel for CPU to get the whole system
information from BMC via IPMI protocol, like SMBUS.
BMC would also listen the information from CPU via LPC, such as port 80 status and serial
messages for SOL function.
3.11.2. PCIE
The PCIe interface is used to achieve the vKVM function and only available when the AST2400
BMC module be installed.
3.11.3. SPI
The SPI interface of BMC module is used for upgrade the system bios on CPU board.
When BMC want to upgrade the system bios on CPU board, “BDX_SPI_MUX_SEL” would be
driven by BMC from high to low.
3.11.4. SMBUS
In order to prevent the multi master hang-up issue, if BMC module is installed, the SMBUS host
would change to BMC, not CPU.
When BMC is installed, the “I2C_Multiplexer_select” would be driven to low to let BMC be the
only host on SMBUS.
CPU would change to via LPC to get the SMBUS information from BMC.
3.11.5. UART
The UART interface is used to achieve SOL function.
CPU UART0 is connected to BMC uart1 block, and is used for SOL.
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