When to register termios devices?

[Jan.Sommer at dlr.de]

> -----Original Message-----
> From: Sebastian Huber <sebastian.huber at embedded-brains.de>
> Sent: Wednesday, November 4, 2020 4:00 PM
> To: Sommer, Jan <Jan.Sommer at dlr.de>; users at rtems.org
> Subject: Re: When to register termios devices?
> 
> Hello Jan,
> 
> if it is a custom BSP, why don't you add it to the console driver of this BSP?
> 
> If you add
> 
> RTEMS_SYSINIT_ITEM(
> 
>   register_additional_termios,
> 
> RTEMS_SYSINIT_DEVICE_DRIVERS,
> 
> RTEMS_SYSINIT_ORDER_LAST_BUT_5
> 
> );
> 

Thanks, that worked perfectly. 
I had the macro declared in a different file and somehow this made the call not show up in the final binary.
Is there some general rule where these declarations have to appear to be included?
I also struggle to comprehend the third parameter. 
If one has multiple items declared for the same stage, I assume that the one with RTEMS_SYSINIT_ORDER_FIRST is called before RTEMS_SYSINIT_ORDER_SECOND.
What does ORDER_MIDDLE and ORDER_LAST_BUT_x mean?

Also is it legal to have e.g. RTEMS_SYSINIT_ORDER_FIRST a.s.o. declared twice for the same stage if the functions are different?


Cheers,

    Jan

> 
> to the module which defines bsp_start(), then your drivers are registered.
> They are also registered, when the application doesn't need them. So, doing
> a driver registration in the application configuration is not that bad.
> 
> --
> Sebastian Huber, embedded brains GmbH
> 
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> 
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