Re: 2.6.3-rc3 serial console woes

Bjorn Helgaas
2004-02-16T23:47:03Z

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