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

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Message-Id: <200705161214.16426.bjorn.helgaas@hp.com>
Date:	Wed, 16 May 2007 12:14:16 -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 Wednesday 16 May 2007 11:09:14 am Maciej W. Rozycki wrote:
> On Wed, 16 May 2007, Bjorn Helgaas wrote:
> 
> > > for early_uart_console, I have some ideas:
> > > 1. merged that into early_serial_console in
> > > arch/x86_64/kernel/early_printk.c, and
> > > move early_printk.c to kernel/, --- make it understand
> > >      earlyprintk=uart,io,0x3f8,9600n8
> > >      earlyprintk=uart,mmio,0xff5e0000,115200n8
> > > in addition to vga, ttyS, serial
> > 
> > I would rather try to merge 8250_early and early_printk.
> > "console=uart,io,0x3f8" is already pretty similar to
> > "earlyprintk=serial", and it would be nice to have only one.
> > 
> > "console=uart" does have the disadvantage that you have to know the
> > port address.  But it has the advantage that it doesn't depend on
> > compiled-in legacy serial port names.  If you need early console
> > output, you're probably a developer and can come up with the address.
> 
>  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.
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