additional serial port on iMX25PDK

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additional serial port on iMX25PDK

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metalheart
Contributor I

Hello Everyone,

 

I need to know how to access the additional serial port on iMX25PDK (personality board). There is a male DB9 connector given on the main personality board. I am guessing it is the "/dev/ttymxc1" port. The "/dev/ttymxc0" is on the debug board which is being used for console. I need a serial port other than console. I tried "cat /dev/ttymxc1" on the console, shorted the rx-tx to see if what I type is reflected, but nothing comes.

I have also written a program to open and write the serial port using termios , it is successfully opening and wrtiting it, but nothing comes on the actual hardware. I have tested this program on ubuntu desktop, and it works perfectly. Is there any jumper setting I am not aware of ? ALso, I know the iMX25 has 5 UARTs, is there any way to bring them out on the board if possible ?

 

Thanks,

Aditya
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Don_ng
Contributor I
I think some people have had luck with CN13 on the personality board, but you will need a ribbon cable, etc to get to the that UART.
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metalheart
Contributor I

Damn it, don't know how did I miss that.

Thanks a lot man...

But how do I get a console on the main  then. Because only CAN is available on the main board, no UART. I also need to bring out another serial port for my serial peripheral.

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fabio_estevam
NXP Employee
NXP Employee

MX25PDK can boot without the debug board. In order to do so you need to pass “remove_dbg" into the kernel command line.

 

This is documented in the MX25 Linux Release Notes document.

 

Regards,

 

Fabio Estevam

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metalheart
Contributor I

ok, got it.

But the question is that how do I bring them out for access. Because, the only serial port is on debug board, which is my shell console. The male DB9 connector is a CAN device (found out from the schematics.

There is another DB9 connector footprint on the debug board, but no actual connector. Now I am starting to think that _this_ is the /dev/ttymxc1 device, and not the one on main board. Also I have observed that the iMX25PDK will not boot without the debug board, is this supposed to happen ?

Anyway, I am working on it, will post a solution when I find it. Thanks for the reply Fabio,...appreciate it.

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fabio_estevam
NXP Employee
NXP Employee

If you are using a mainline kernel you should register the serial port as follows:

imx25_add_imx_uartX(&uart_pdata);  (where X is 0 for UART1, 1 for UART2, etc).

 

If you are using a FSL kernel, then you need to open arch/arm/mach-mx25/serial.c and make sure that

UART3_ENABLED is enabled (supposing you want to enable UART3 in this example).

 

Regards,

 

Fabio Estevam

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