linux-kernel - Re: [PATCH]serial: make early_uart to use early_prarm instead of console

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Message-Id: <200705211053.34131.bjorn.helgaas@hp.com>
Date:	Mon, 21 May 2007 10:53:33 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Gerd Hoffmann" <kraxel@...hat.com>, "Andi Kleen" <ak@...e.de>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"linux kernel mailing list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH]serial: make early_uart to use early_prarm instead of console_initcall

On Monday 21 May 2007 12:56:37 am Yinghai Lu wrote:
> Bjorn,
> I can not find fixmap.h for ia64.....hope you can use ioremap instead,
> then we can create one dummy fixmap.h in include/asm-ia64

ia64 ioremap should work early enough, so it doesn't have fixmap.
Seems like in this case, maybe bt_ioremap() would be more
appropriate than fixmap, since there's no requirement that
virtual address be known at compile-time.

> [PATCH]serial: make early_uart to use early_prarm instead of console_initcall

s/prarm/param/

> new command line will be
> 
> earlycon=uart,io,0x3f8,9600n8
> earlycon=uart,io,0x3f8,9600n8 console=tty0
> earlycon=uart,mmio,0xff5e0000,115200n8

Why do we have to have a new "earlycon" argument?  Why can't we just
parse "console=uart" early?

BTW, if you want to convert it from "console=uart" to "console=8250",
as part of this cleanup, I think that would be OK.  Just make it a
separate patch and don't forget to change drivers/firmware/pcdp.c and
Documentation/kernel-parameters.txt at the same time.

Bjorn
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