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

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Date:	Mon, 21 May 2007 10:36:58 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Bjorn Helgaas" <bjorn.helgaas@...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 5/21/07, Bjorn Helgaas <bjorn.helgaas@...com> wrote:
> > 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?

with console=uart, you need to call early_serial_console_init
explictly in your arch setup_arch to get early console.

with console_initcall(early_uart_console_init), the early_uart_console
will be called via console_init in start_kernel, init/main.c that is
not real early console.

YH
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