Resetting console on boot

[Warner Losh]

And sometimes having both leads to the problem...  vidconsole is not a
total solution.

Warner

On Thu, Jul 18, 2019 at 8:57 AM Ryan Moeller <ryan at ixsystems.com> wrote:

> Apparently this also could be wanted with vidconsole, as some IPMI console
> redirection to com1 and serial over lan redirects from the vidconsole. I
> just discovered this while testing Lev's patches.
>
> -Ryan
>
> On Tue, Jul 16, 2019 at 11:08 AM Warner Losh <imp at bsdimp.com> wrote:
>
> >
> >
> > 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
> >
>
>
> --
> Ryan Moeller
> iXsystems, Inc.
> OS Developer
> Email: ryan at iXsystems.com
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