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General PTY and CONSOLE question
- Date: Fri, 19 Sep 2008 13:43:16 -0500
- From: joel.sherrill at OARcorp.com (Joel Sherrill)
- Subject: General PTY and CONSOLE question
Thomas Doerfler wrote:
> during startup RTEMS tries to open "dev/console". If you don't a device
> of this name, you will run into trouble. PTY will be initialized later
> (AFAIK), so this can't be a replacement.
Depends on the RTEMS version. This is the
+ in 4.6 /dev/console was required and if open() on it
failed, it was a fatal error.
+ in 4.7.1, the open could fail without causing a fatal error.
This made the console optional but open() always got
+ In 4.8, this routine was refactored so there could be
a "no-console.c" optional stub to avoid open() being
+ Basically the same in 4.9.
> Maybe the NULL device can help you as a dummy replacement of the console?
When you had to have /dev/console, you could link /dev/console
to /dev/null and get by. Now you only need to do that if you print
to stdout and assume that it is automatically setup for you.
> Gene Smith wrote:
>> Does a PTY driver require the console driver? When I remove
>> CONSOLE_DRIVER_TABLE_ENTRY from the Device_drivers array I get no pty
>> login. Are they somehow tied together? Examples I have seen on the list
>> have the both.
>> I need to run with my UART h/w disabled (I can't have it on, I need its
>> I/O ports for other functions). However I would still like the PTY
>> login/shell to be working (for now).
>> The other problem also might be that print[kf] calls are still present
>> in the code. printk still tries to send chars to the uart even when
>> CONSOLE is gone. I am not sure about printf.
>> rtems-users mailing list
>> rtems-users at rtems.com
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Joel Sherrill, Ph.D. Director of Research & Development
joel.sherrill at OARcorp.com On-Line Applications Research
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