Odd-looking serial console prompt on RPI2

[Ian Lepore]

On Wed, 2017-03-01 at 18:01 -0800, Oleksandr Tymoshenko wrote:
> Ian Lepore (ian at freebsd.org) wrote:
> > 
> > On Wed, 2017-03-01 at 16:03 -0800, bob prohaska wrote:
> > > 
> > > On Wed, Mar 01, 2017 at 09:20:13PM +0100, Michael Tuexen wrote:
> > > > 
> > > > 
> > > > Interesting... Let us know what works and what doesn't...
> > > > 
> > > > Best regards
> > > > Michael
> > > > 
> > > As of FreeBSD 12.0-CURRENT (RPI2) #0 r314450: Wed Mar  1 14:48:26
> > > PST
> > > 2017
> > > the serial console is still corrupt (output truncated, input not
> > > echoed
> > > but treated like the enter key).  The serial console does seem to
> > > work
> > > with U-boot and loader, so I don't think it's the upstream
> > > hardware. 
> > > 
> > > The HDMI console looks normal and USB keyboard input seems to
> > > work.
> > > 
> > > There have been several updates to /usr/src/sys/dev/uart and it
> > > looks
> > > as if kernel updates are still coming. Maybe the job simply isn't
> > > done yet.
> > > 
> > > bob
> > > 
> > It seems like this might be caused by r314318.  Can someone having
> > this problem confirm if 314317 works and 314318 fails?
> Tested on my RPi2, 314317 - works, 314318 - broken
> 

CC'ing jchandra at .

I wonder if there is some bad interaction when the same uart is used as
a console and a tty?

-- Ian