SMBus Configuration

The SMBus address resolution protocol (ARP) is supported to assign a unique SMBus slave address. Two SMBus slave addresses are supported as follows.

• Fixed SMBus slave address: The SMBus ARP slave address, 0x61 is used. Always enabled.
• Reserved SMBus slave address: Assigned by the SMBus owner (typically the BMC of the server) via SMBus ARP. The imgctrl tool can be used to assign an SMBus slave address.

The imgctrl tool is a Napatech standalone tool which manages the FPGA image configuration of Napatech SmartNICs. The imgctrl tool offers the following 3 modes of operations:

• query: Read the SmartNIC configuration.
• switch: Switch to the secondary FPGA image configuration.
• program: Program a new FPGA image into the secondary FPGA flash bank.

To assign a non-volatile SMBus slave address of the SmartNIC, use the --program option (or -p) with the --smb-adr option. For example:

./imgctrl -p -a0 --ini nt --smb-adr 96

An output example:

..
OK. SMB 8bit slave address has been set. New NVM address = 96

The SMBus addresses are readable using the --query option.

./imgctrl -a0 -ql

An output example:

..
SMB-8bit-broadcast-adr : 0xC2
SMB-8bit-slave-adr : 0x60
SMB-8bit-nvm-slave-adr : 0x60
..

See DN-0487 for more information on the imgctrl tool and how to program an SMBus address using the --smb-adr parameter.