[PATCH] console: Add option to keep it silent until env is loaded

[Harald Seiler]

Hi Simon,

On Tue, 2022-07-12 at 04:58 -0600, Simon Glass wrote:
> Hi Harald,
> 
> On Wed, 6 Jul 2022 at 05:19, Harald Seiler <hws at denx.de> wrote:
> > 
> > Add a config-option which forces the console to stay silent until the
> > proper environment is loaded from flash.
> > 
> > This is important when the default environment does not silence the
> > console but no output must be printed when 'silent' is set in the flash
> > environment.
> > 
> > After the environment from flash is loaded, the console will be
> > silenced/unsilenced depending on it.  If PRE_CONSOLE_BUFFER is also
> > used, the buffer will now be flushed if the console should not be
> > silenced.
> > 
> > Signed-off-by: Harald Seiler <hws at denx.de>
> > ---
> >  common/Kconfig   | 10 ++++++++++
> >  common/console.c |  5 +++++
> >  2 files changed, 15 insertions(+)
> 
> This seems OK to me. You might want to implement the silent-console
> device tree property in console_update_silent() too, which was dropped
> in the conversion to driver model.

This looks interesting, I'll have to look into it.

Do you know if there's any effort towards supporting such a flag in the
kernel as well?  I had to remove the serial console property from my DT
and instead pass console info via cmdline to make the silent console
work.  A "pure DT" solution of any sort would have been nicer of
course...

-- 
Harald