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Getting Started
20ME04-00 E2

2020-02-25 Page 28
2.7.1.1 Accessing SMBus/I2C Devices via Generic Access using smb2_ctrl
The smb2_ctrl tool provides direct access to any SMBus/I2C device.
The tool provides two different operation modes:

Command Line Interface (CLI) Mode: The tool operates in this mode when you call
smb2_ctrl only with the device name parameter, e.g.: smb2_ctrl smb2_1 . Then you will
get a CLI that asks you for further actions.

Command Mode: Call smb2_ctrl with the device name parameter and at least the
action (i.e. the command) you want to perform. E.g.: smb2_ctrl smb2_1 rb
Note: The command mode is useful to script the tool.
For a detailed description about all supported tool options, just call
smb2_ctrl , e.g.:
Usage Examples

List all available SMB devices at SMBus instance smb2_1 :

Access the board information EEPROM (SMB address
0xAC
) to read byte at offset 8:

Access the CPU board BMC (in this example at SMB address
0x9C
) to read out the
operating hours counter:

Access the CPU board BMC (in this example at SMB address
0x9C
) to set the upper
limit of the watchdog to 200 ms:
C:\MEN\ErtcSmb\Applications> smb2_ctrl
> smb2_ctrl smb2_1 list
> smb2_ctrl smb2_1 rbd -a=0xac -o=0x8
> smb2_ctrl smb2_1 rbk -a=0x9c -o=0x94
> smb2_ctrl smb2_1 wwd -a=0x9c -o=0x14 -d=0x0002