linux-kernel - Re: [PATCH 4/5] serial: convert early

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Date:	Thu, 31 May 2007 11:49:01 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Bjorn Helgaas" <bjorn.helgaas@...com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Andi Kleen" <ak@...e.de>, "Russell King" <rmk@....linux.org.uk>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] serial: convert early_uart to earlycon for 8250

On 5/31/07, Bjorn Helgaas <bjorn.helgaas@...com> wrote:
> > not really.
>
> I'm sorry, I don't understand the point you're making.
>
> Andrew's proposal was that we could add early_uart_ioremap to the list of
> bt_ioremap and dmi_ioremap.
>

for i386, bt_ioremap is using fixmap, and it is temporary boot-time
mappings, used before ioremap() is functional.
but we need one as permanent fixed address.

for x86_64, early_ioremap. I'd like to make to static, because
dmi_ioremap could use ioremap instead.

Fix address could make the earlycon can be used more earlier.

YH
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