Serial connection between management controller and microcontroller

A method for communicating with a microcontroller, comprising:

• receiving a first signal from a baseboard management controller (BMC) of a computing system at a bridging chip of a daughterboard communicatively coupled to a motherboard through an interface;
• converting, at the bridging chip of the daughterboard, the received first signal into a second converted signal;
• transmitting, from the bridging chip to a microcontroller of the daughterboard, the second converted signal;
• transmitting, from the microcontroller to the bridging chip, a third signal;
• converting, at the bridging chip, the third signal into a fourth converted signal;
• and
• transmitting, from the bridging chip through the interface, the fourth converted signal to the BMC.

A daughterboard, comprising:

• an electrical contact to communicatively couple with a corresponding electrical contact of a motherboard;
• a microcontroller;
• and
• an inter-integrated circuit (I2C) to universal asynchronous receiver/transmitter (UART) bridging chip communicatively coupled with the electrical contact of the daughterboard and the microcontroller to convert a first I2C signal received at the electrical contact to a first UART signal to be sent to a UART terminal of the microcontroller and to convert a second UART signal sent from the UART terminal of the microcontroller to a second I2C signal to be sent to the electrical contact, wherein signals converted at the I2C to UART bridging chip comprise messages corresponding to a serial connection between a baseboard management controller (BMC) and the microcontroller.