Re: Early console confusion

["H. Peter Anvin" <hpa@zytor.com>]

On 09/22/2010 09:44 AM, Bjorn Helgaas wrote:
>
> If we don't like "uart8250,io,0x3f8" (which I agree is awfully clunky),
> we could easily add something like "console=com1" which encapsulated
> the well-defined PC concept.

console=ttyS0 ... already works fine.

> It would be similar to "earlyprintk=ttyS0",
> and if it could be made *enough* like it, maybe "earlyprintk=ttyS0"
> could be dropped.
>
> I also see the recent "earlyprintk=hsu" patch from  Feng Tang, and I
> wonder whether that could be recast in the "console=hsu" style.  Like
> "com1", "hsu" is apparently enough to specifically identify a device.
>
> I think it's nicer to extend "console=" in ways that allow early
> devices, because then users don't have to mess with both "console="
> and "earlyprintk=".  The 8250_early driver has a reasonable model
> of switching from the early device to the real one automatically,
> so maybe something like this is all we would need:

console= is supported multiple times, and enabling console= shouldn't 
necessarily enable earlyprintk...

But yes, it's ugly and we have bass-ackwards compatibility problem...

	-hpa