Odd-looking serial console prompt on RPI2

[Jayachandran C.]

On Thu, Mar 2, 2017 at 7:35 AM, Ian Lepore <ian at freebsd.org> wrote:
> 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?

I don't have a RPi3 setup to test now, I will look at the code again to see if
I can find an issue.

Otherwise I will revert the change until we can find why the RPi UART breaks
with these changes.

Thanks,
JC.