Hi Bhaskara,
Since the board(STM32F091) is not supported by Embedded Coder we can't deploy the code on to the board, but if you are interested only in code you can use codegen to generate the code since that is independent of the board.
A potential workaround would be creating a custom target support refer to this doccumentation Develop a Target - MATLAB & Simulink (mathworks.com)