From: Gary Thomas <gary@mlbassoc•com>
To: "Matthew L. Creech" <mlcreech@gmail•com>
Cc: linuxppc-dev@ozlabs•org
Subject: Re: MPC83xx console : no output after handover
Date: Tue, 31 Mar 2009 14:45:20 -0600 [thread overview]
Message-ID: <49D280E0.9020701@mlbassoc.com> (raw)
In-Reply-To: <5ee96a840903311330y36ed97bet92319da8d118086@mail.gmail.com>
Matthew L. Creech wrote:
> (Sorry if this is a dupe, but I think my first attempt was filtered out)
Nope, it made it.
> Hi,
>
> I'm trying to get Linux booting on a custom board based on the MPC8313
> ERDB, but there's no output after the console is transferred. I get
> the following:
>
> Using MPC831x RDB machine description
> Linux version 2.6.29 (mlcreech@lap) (gcc version 4.3.2 (Sourcery G++ Lite 4.3-50
> ) ) #2 PREEMPT Tue Mar 31 14:54:27 EDT 2009
> console [udbg0] enabled
>
> ... (normal boot output) ...
>
> Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> serial8250.0: ttyS0 at MMIO 0xe0004500 (irq = 16) is a 16550A
> console handover: boot [udbg0] -> real [ttyS0]
> serial8250.0: ttyS1 at MMIO 0xe0004600 (irq = 17) is a 16550A
>
> If I boot with "console=udbg0,115200", then it gets much further along
> before printing "turn off boot console udbg0". So presumably the
> kernel is booting beyond this point, but my console isn't printing any
> output. I traced from that last line back up the call stack to the
> end of drivers/serial/8250.c:serial8250_init(), and everything seems
> okay (it returns 0, and pritnk() still works fine at that point). I'm
> not sure where to go from there to figure out where the problem lies.
> Could someone point me in the right direction, or suggest what might
> cause a console problem like this?
What does your command line (boot args) when it fails? It should
probably have something like "console=ttyS0,115200" in it.
--
------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
------------------------------------------------------------
next prev parent reply other threads:[~2009-03-31 20:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-31 20:30 MPC83xx console : no output after handover Matthew L. Creech
2009-03-31 20:45 ` Gary Thomas [this message]
2009-03-31 21:03 ` Matthew L. Creech
2009-03-31 21:26 ` Gary Thomas
2009-03-31 22:22 ` Matthew L. Creech
2009-04-01 18:53 ` Matthew L. Creech
2009-04-02 10:52 ` Gary Thomas
2009-04-02 15:20 ` Matthew L. Creech
2009-03-31 21:48 ` Scott Wood
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