SMBA (SMB Alert) is an additional function to SMB. So you would have to set both SDA and SCL for the desired SMB channel (I2C), as well as the corresponding SMBA pin.
You have found the SMBA for I2C2 twice, because on the STM32F303ZET it is either on PB12 or on the alternative pin PA8.
Does it answer your question?
Regards
/Peter
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