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

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Date:	Sun, 20 May 2007 23:56:37 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Bjorn Helgaas" <bjorn.helgaas@...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 5/20/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> hm, OK.  I hope you guys have it under control ;)
>
>
> With http://userweb.kernel.org/~akpm/config-vmm.txt I get
>
> drivers/built-in.o:(.data+0x5790): undefined reference to `serial8250_find_port_for_earlycon'
>

please check this one

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

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

Make early_uart to use early_param, so uart console can be used earlier.
Make it to be bootconsole with CON_BOOT flag, so can use console handover
feature. and it will switch to corresponding normal serial console
automatically.
new command line will be

earlycon=uart,io,0x3f8,9600n8
earlycon=uart,io,0x3f8,9600n8 console=tty0
earlycon=uart,mmio,0xff5e0000,115200n8

it will print in very early stage
Early serial console at I/O port 0x3f8 (options '9600n8')
later for console it will print
console handover: boot [uart0] -> real [ttyS0]

Signed-off-by: <yinghai.lu@....com>

View attachment "earlycon_05202007.diff" of type "text/x-patch" (13206 bytes)