[PATCH 14/18] console: Print out complete stdio device list

[Bin Meng]

Hi Heinrich,

On Sun, Jul 23, 2023 at 8:48 PM Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
>
>
> Am 23. Juli 2023 14:04:39 MESZ schrieb Bin Meng <bmeng.cn at gmail.com>:
> >Hi Heinrich,
> >
> >On Sun, Jul 23, 2023 at 2:38 PM Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> >>
> >> On 7/23/23 06:40, Bin Meng wrote:
> >> > At present if both CONSOLE_MUX and SYS_CONSOLE_IS_IN_ENV are on,
> >> > during boot, the printed out stdio devices are incomplete, e.g.:
> >> > with "stdout=serial,vidconsole", only "vidconsole" is printed.
> >> >
> >> > For such case, we can print out the stdio device name from the
> >> > environment variables.
> >> >
> >> > Signed-off-by: Bin Meng <bmeng at tinylab.org>
> >> > ---
> >> >
> >> >   common/console.c | 30 +++++++++++++++++++++---------
> >> >   1 file changed, 21 insertions(+), 9 deletions(-)
> >> >
> >> > diff --git a/common/console.c b/common/console.c
> >> > index af52897ec3..98c3ee6ca6 100644
> >> > --- a/common/console.c
> >> > +++ b/common/console.c
> >> > @@ -1014,15 +1014,27 @@ static void stdio_print_current_devices(void)
> >> >   {
> >> >       char *stdinname, *stdoutname, *stderrname;
> >> >
> >> > -     stdinname = stdio_devices[stdin] ?
> >> > -                 stdio_devices[stdin]->name :
> >> > -                 "No input devices available!";
> >> > -     stdoutname = stdio_devices[stdout] ?
> >> > -                  stdio_devices[stdout]->name :
> >> > -                  "No output devices available!";
> >> > -     stderrname = stdio_devices[stderr] ?
> >> > -                  stdio_devices[stderr]->name :
> >> > -                  "No error devices available!";
> >> > +     if (CONFIG_IS_ENABLED(CONSOLE_MUX) &&
> >> > +         CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV)) {
> >> > +             /* stdin stdout and stderr are in environment */
> >> > +             stdinname  = env_get("stdin");
> >> > +             stdoutname = env_get("stdout");
> >> > +             stderrname = env_get("stderr");
> >> > +
> >> > +             stdinname = stdinname ? : "No input devices available!";
> >> > +             stdoutname = stdoutname ? : "No output devices available!";
> >>
> >> This string will never be printed as you have no output device.
> >
> >This logic follows what it was before. Yes, without a stdout device,
> >puts() or printf() is useless.
> >
> >>
> >> > +             stderrname = stderrname ? : "No error devices available!";
> >> > +     } else {
> >> > +             stdinname = stdio_devices[stdin] ?
> >> > +                     stdio_devices[stdin]->name :
> >> > +                     "No input devices available!";
> >> > +             stdoutname = stdio_devices[stdout] ?
> >> > +                     stdio_devices[stdout]->name :
> >> > +                     "No output devices available!";
> >>
> >> ditto
> >>
> >> > +             stderrname = stdio_devices[stderr] ?
> >> > +                     stdio_devices[stderr]->name :
> >> > +                     "No error devices available!";
> >> > +     }
> >>
> >> do_coninfo() shows how to print all muxed devices irrespective of
> >> SYS_CONSOLE_IS_IN_ENV.
> >
> >Are you suggesting we refactor the codes to follow the same logic used
> >in do_coninfo()?
>
> As the coninfo command is enabled on most devices, we could use a common output function to reduce code size.
>
> Do we need this output at all if we hsve coninfo?

I think so. U-Boot has been displaying the stdio devices for quite a
long time. The config option SYS_CONSOLE_INFO_QUIET was introduced for
any board who does not want this.

config SYS_CONSOLE_INFO_QUIET
    bool "Don't display the console devices on boot"
    help
      Normally U-Boot displays the current settings for stdout, stdin
      and stderr on boot when the post-relocation console is set up.
      Enable this option to suppress this output. It can be obtained by
      calling stdio_print_current_devices() from board code.

Tom, what's your idea?

Regards,
Bin