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Hello, sankar! I was able to track down this response from someone on the Rangeley team: "The SMBus2 Unit 2 interface uses as PECI over SMBus and shared function and signals with UART0. Even the signal pins are set to use as SMBus, the UART0 function should not be disable (refer to errata AVR3). As SoC default, the SMBus is selected when power on. Then SW enable the UART for both ports. This will allow to use UART1 and SMBus2 PECI."