=> setenv cons_opts 'console=tty0 console=ttyS0,${baudrate}' => printenv cons_opts cons_opts=console=tty0 console=ttyS0,${baudrate} =>
=> setenv cons_opts 'console=tty0 console=ttyS0,${baudrate}' => printenv cons_opts cons_opts=console=tty0 console=ttyS0,${baudrate} =>