/dev/ttyS0 on 547x

SteveJoiner — Wed, 19 Sep 2007 04:27:57 GMT

I'm using LTIB (20070107) on a 5475 board. The default configuration is for PSC0 to be used as a console. I've been using that for a while, and it works fine. Now, I want to disable the console and use PSC0 as /dev/ttyS0 in my application.

I have commented out the call to register_console() in arch/m68k/coldfire/config.c. It seems like that is all I should need to do, but I'm having a problem. I can see that data is being received on /dev/ttyS0, but when the driver tries to transmit, no data shows up on my RS-232 port. I can see that transmit_chars() in drivers/serial/mcfserial.c is being called once for the first character, but never gets called again.

Can anyone make any suggestions on this? Has anyone been able to get the /dev/ttyS* devices to work with the 547x/8x LTIB?

Thanks,
Steve

Re: /dev/ttyS0 on 547x

SteveJoiner — Thu, 20 Sep 2007 05:09:34 GMT

I found the problem. I was using hardware flow control (RTSCTS) on the tty. This is implemented in the driver, but the driver isn't configuring the pins for use by the PSC. I updated the driver to write the correct value to MCF_GPIO_PAR_PSC0 and everything seems to work fine now.

Whoever is maintaining that code will probably want to make this update as well.

-Steve

topic Re: /dev/ttyS0 on 547x in ColdFire/68K Microcontrollers and Processors

/dev/ttyS0 on 547x

Re: /dev/ttyS0 on 547x