Dear Simon,
In message <capnjgz1tbn+ro8f0ndubayri54uav0lxjrdfz-aw5qbgue1...@mail.gmail.com>
you wrote:
>
> > Please make up your mind: either you CAN initialize the console, then
> > you can use it to output messages in a regular way, or you CANNOT
> > initialize it, in which case you cannot print anything. There is no
> > third option.
>
> Well that is very clear - we cannot. We hit panic() before
> console_ready() is called.
OK - but this means that no output to a serial console port can be
done, no matter what you try.
> > If you have "available UARTs", you could use this as console, right?
>
> Yes, if we knew which it was.
This is a design issue. If there are several similar boards that
shall be handled with the same binary, then you must agree on some
common sub-set of features, like on UART port that is available on all
of these, and use this as (early) console port.
> We know we won't get to console init in this case - there is a panic()
> that happens first. So the existing pre-console putc() becomes our
> route to displaying a message. The problem with that is only that the
No. When you cannot initialize the console, you cannot output
anything to the console. Period.
If there is a way to do some initialization and output charatcers,
than make this your regular console init code, and use it always,
without any special warts.
> board init hasn't happened yet, so either the pre-console putc() must
> init the UARTs or we need a separate init function.
This makes no sense to me.
> So the existing pre-console putc() can be used, if we can sort out how
> to make UART init work. Graeme suggested an approach here - I will see
> if I can make that work.
I don't think I will accept any "pre-console putc()". This is such a
dirty hack. Either you can initialize and use putc, then use the
normal console mechanism for it, or you cannot. And "cannot" means
"cannot" here.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
I have the simplest tastes. I am always satisfied with the best.
-- Oscar Wilde
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