[PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit option

[Alan Cox]

On Mon, 2015-01-12 at 16:35 +0100, Arnd Bergmann wrote:
> On Monday 12 January 2015 21:08:21 Eddie Huang wrote:
> > Add earlycon support not only baudrate option, but also add noinit option.
> > If use noinit option, 8250 earlycon will not init serial hardware and use
> > loader setting.
> > 
> > Signed-off-by: Eddie Huang <eddie.huang at mediatek.com>
> 
> I probably missed something in the previous discussion, but why is
> "noinit" not just the default? I believe that is how we handle early
> serial ports on PowerPC, and I see no downsides to it.

Most PC hardware at least needs the port initialised to use it. It won't
have been configured by the firmware in many cases.

Alan