I use an IMX28 to communicate with a GPRS modem SIM900.
I would like to be able to send AT commands during data session (ppp), so I intend to use the GSM 0710 standard to multiplex the serial port.
I think the option to check in the kernel menuconfig is "GSM MUX line discipline support", isn't it ?
But after the compilation, how can I multiplex my serial port on my board ? What are the commands to enter?
I use Yocto + bitbake with kernel 3.12.
Many thanks and best regards.