From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Greg KH <gregkh@linuxfoundation.org>,
"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: Non-working serial console
Date: Mon, 6 Jun 2022 16:31:44 +0200 [thread overview]
Message-ID: <CAHp75Vc01Ei5wEKG6kqELD=O3CSz8xs3jd8KJpxnfYJ=+f_nXA@mail.gmail.com> (raw)
In-Reply-To: <477007d7-e573-56dd-90de-877eeebd5c4c@molgen.mpg.de>
On Mon, Jun 6, 2022 at 5:44 AM Paul Menzel <pmenzel@molgen.mpg.de> wrote:
> Am 04.06.22 um 11:04 schrieb Greg KH:
...
> I am still confused, that `earlyprintk=ttyS0,115200,keep` works though
> despite `CONFIG_SERIAL_8250=m`. Doesn’t that mean, that Linux
> nevertheless contains some code to initialize the serial console, and
> send data to it?
If you keep x86 in mind, then yes, three different console code
handling (decompressing stage, boot stage, driver stage) + earlyprintk
(on top of the same code for decompressing / booting stages) +
earlycon (this is actually a driver:ish stage).
--
With Best Regards,
Andy Shevchenko
prev parent reply other threads:[~2022-06-06 14:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-02 16:50 Non-working serial console Paul Menzel
2022-06-02 21:09 ` Paul Menzel
2022-06-04 9:04 ` Greg KH
2022-06-04 9:21 ` Paul Menzel
2022-06-06 14:31 ` Andy Shevchenko [this message]
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