Re: 2.6.3-rc3 serial console woes

[Bjorn Helgaas <bjorn.helgaas@hp.com>]

On Monday 16 February 2004 4:25 pm, Keith Owens wrote:
> Spoke too soon.  That one line patch makes the serial console available
> early in boot.  But as soon as /sbin/init runs, the console is
> gibberish due to a speed mismatch.  Completely reverting
> 
>   http://linux.bkbits.net:8080/linux-2.5/cset@1.1653?nav=index.html|ChangeSet@-7d
> 
> works fine.  Since this is a -rc kernel, can we revert the cset until
> it is fixed?

Reverting for now sounds like the right thing to me.  I would like to
understand what's going on, though.

For the serial console to work early, serial8250_console_setup() must
be returning zero.  So we can't be taking this return:

	if (!port->ops)
		return -ENODEV;

and therefore, the hunk in serial_core.c shouldn't have any effect either.
So is it merely the fact that we call serial8250_late_console_init()?

I wouldn't expect that to make any difference, because the setup()
call from serial8250_console_init() should have succeeded, so
CON_ENABLED should have been set, and we don't do anything in
that case.

Keith, can you tell me how to reproduce this?

Bjorn