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Date: Tue, 11 Oct 2016 18:50:22 +0200
From: Polytropon <freebsd@edvax.de>
To: Boris Samorodov <bsam@passap.ru>
Cc: freebsd-questions@freebsd.org
Subject: Re: Call-out ports renamed cuadX -> cuauX -- when?
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On Tue, 11 Oct 2016 13:37:47 +0300, Boris Samorodov wrote:
> 11.10.2016 01:52, Polytropon пишет:
> 
> > On my FreeBSD 8 home system, "man 4 sio" contains the following
> > convention in the FILES section:
> 
> Just a note. Those are two different device drivers: sio and uart.
> It's UART(4) that uses the 'u' notation for cua (call-up asynchronous)
> ports.

Good finding! Checking "man 4 uart" for 12-CURRENT says:

     /dev/ttyu?           for callin ports
     /dev/ttyu?.init
     /dev/ttyu?.lock      corresponding callin initial-state and lock-state
                          devices

     /dev/cuau?           for callout ports
     /dev/cuau?.init
     /dev/cuau?.lock      corresponding callout initial-state and lock-state
                          devices

which is exactly the same as I see it on my 8.2 home system.
So that part of the mystery has successfully been solved. :-)



> I guess, my question may be transformed to "when did the UART driver
> become the default". (may be around 7->8)?

On 8.2, "uart" part of GENERIC. On 5.2-p8, "sio" is used instead.
(Sadly I currently don't have access to FreeBSD systems v6 and v7.)
That narrows down the search a bit - you just have to check the
revisions of conf/GENERIC to see when the change happened. :-)



-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...