On Wed, Apr 1, 2015 at 8:22 PM, Peter Hurley <peter@hurleysoftware.com> wrote:
> The documented behavior of console=ttyS options, to which your
> quote refers, clearly states:
>
>                 Default is "9600n8".

drivers/tty/serial/8250/8250_early.c:early_serial8250_setup
still have calling to probe_baud, but it is not triggered.

Here is root cause.
The gap between entries in earlycon_table cause
iteration fail to find next entry, so uart8250 handler is
not called proplerly.

attached patch fix the problem.

Thanks

Yinghai