linux-kernel - Re: [patch] early printk and boot console fixups.

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Message-Id: <200705171118.09413.bjorn.helgaas@hp.com>
Date:	Thu, 17 May 2007 11:18:09 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>, Gerd Hoffmann <kraxel@...e.de>,
	Andi Kleen <ak@...e.de>, akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [patch] early printk and boot console fixups.

On Thursday 17 May 2007 03:45:36 am Maciej W. Rozycki wrote:
> On Wed, 16 May 2007, Bjorn Helgaas wrote:
> > >  Given the generic name of "uart" I am assuming this will work with any 
> > > UART driver making use of the serial_core.c core -- am I correct?
> > 
> > I knew somebody would ask that eventually :-)
> > 
> > Unfortunately, the answer is "no."  "console=uart" only works with
> > 8250-compatible devices.
> 
>  But is it a design limitation or is it just that other UART drivers have 
> to be modified to work with this option?  My point is if the former, then 
> the option should be something like "console=8250" (the right-hand side 
> being the name of the driver involved; others may want to add support for 
> other drivers).  If the latter, then it's fine as is as other UART drivers 
> may be wired to this code as a need arises.

"console=8250" probably would have been a better choice.  I think
this could be changed without too much hassle.

It might be possible to extend "console=uart" so one could do
"console=uart,io,0x3f8,9600n8,21285" (where "21285" is a non-8250
UART type).  But that seems ugly to me.  I'd rather have
"console=21285", "console=68328", etc.

I just want the "console=<tag>" to explicitly identify the UART
type so we don't have to poke at the thing and guess what it is.

Bjorn
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