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

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Message-Id: <20070520214657.fcf5e9ce.akpm@linux-foundation.org>
Date:	Sun, 20 May 2007 21:46:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
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 Sun, 20 May 2007 21:29:20 -0700 "Yinghai Lu" <yhlu.kernel@...il.com> wrote:

> On 5/20/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > I'll queue this up for some testing, but I'd be a bit reluctant to send it
> > into Linus due to my poor understanding of what it actually does.  What
> > _is_ an early console, and how does it differ from a non-early one?
> >
> > Someone help, please.
> >
> > Coudl you please provide a patch against
> > Documentation/kernel-parameters.txt as well?
> >
> the story:
> Bjorn refer to andi's early_printk to create one early_uart. it took
> console=uart,io,0x3f8,9600n8
> or console=uart,mem,0xfxxx,115200n8.
> and it is called via console_init. --- it is not really early uart for
> platform other than ia64.
> ia64 call early_serial_console_init explicitly, so it is some early.
> but it needs to late_initcall to do console switch.
> 
> Gerd's patch  (console handover) was merged into mainline. it will
> switch from early_printk to normal console in register_console via
> CON_BOOT flags.. ===> only for x86
> 
> I produced one patch to change early_uart calling from console_init to
> early_param. So to make early_uart to real early_uart for all other
> platform in addition to ia64.
> it will take
> earlycon=uart,io,0x3f8,9600n8 console=ttyS0,9600n8
> 
> but Bjorn said that don't let the customer to key two times about
> console command line.
> Then come this patch. will take
> earlycon=uart,io,0x3f8,9600n8
> and it will switch to console ttyS0 automatically. ---- by calling
> add_preferred_console.
> 
> Still need Bjorn to:
> 1. remove early_serial_console_init call in ia64 setup_arch.
> 2. verify mem io 8250 compatiable card.
> 
> for 2, in x86 platform we need to use fix_to_virt and fix map to give
> it one fixed virtual address. == like Eric did for usb debug port
> console.
> 
> I will send out another in email about updated early dbgp console with
> current tree.

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'

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