Resetting console on boot

[Warner Losh]

On Tue, Jul 16, 2019 at 4:55 AM Lev Serebryakov <lev at freebsd.org> wrote:

> On 15.07.2019 23:29, Ryan Moeller wrote:
>
> > What do people think about having an early boot stage send some escape
> > sequence to reset terminals to some sane default terminal settings? Often
> > firmware or other causes will leave an unreadable font color or break
> line
> > feeds, and the terminal tends to stay that way until a shell clears and
> > resets the screen. If a shell can do it, surely loader could do it (or
> even
> > earlier, if it is not too complex). To my knowledge it should be just a
> > matter of printing some escape codes before starting the normal boot
> menus
> > when using a serial console. I believe this is already done when the
> > console is set to vidconsole or efi.
> >
> > Thoughts? Suggestions?
>
>  I've proposed this long ago for serial terminals:
>
> https://reviews.freebsd.org/D17102
> https://reviews.freebsd.org/D17103
>
>  I have hardware which sets "black on black" before passing control to OS.
>

That would work for the BIOS case, but not the UEFI case, which is where I
see the biggest issues.

Warner