linux-kernel - Re: Strange output on the console

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Message-ID: <20220228110559.2a8e0b32@gandalf.local.home>
Date:   Mon, 28 Feb 2022 11:05:59 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Wander Costa <wcosta@...hat.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        John Ogness <john.ogness@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wander Lairson Costa <wander@...hat.com>,
        Willy Tarreau <w@....eu>,
        David Laight <David.Laight@...lab.com>
Subject: Re: Strange output on the console

On Sat, 26 Feb 2022 08:49:45 -0300
Wander Costa <wcosta@...hat.com> wrote:

> Hi Steve and Sergey,
> 
> Could you please tell the serial controllers in your hardware?

Not sure how to find that information, but I tried ;-)

On one machine, lspci gives:
 00:16.3 Serial controller: Intel Corporation 7 Series/C210 Series Chipset Family KT Controller (rev 04)

and dmidecode gives:


  Handle 0x0023, DMI type 8, 9 bytes
  Port Connector Information
          Internal Reference Designator: VGA/COMA
          Internal Connector Type: None
          External Reference Designator: COMA
          External Connector Type: DB-9 male
          Port Type: Serial Port 16550A Compatible

  Handle 0x0024, DMI type 8, 9 bytes
  Port Connector Information
          Internal Reference Designator: COMB
          Internal Connector Type: Proprietary
          External Reference Designator: COMB
          External Connector Type: DB-9 male
          Port Type: Serial Port 16550A Compatible


On another machine, there's nothing in lspci, and dmidecode gives:

  Handle 0x0007, DMI type 8, 9 bytes
  Port Connector Information
          Internal Reference Designator: J2A2A
          Internal Connector Type: None
          External Reference Designator: COM A
          External Connector Type: DB-9 male
          Port Type: Serial Port 16550A Compatible

and dmesg has:

  Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
  serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

Anything else I could do to find out more?


-- Steve