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Message-ID: <86802c440810141539x97ceaa4meaab109fae3d9d4c@mail.gmail.com>
Date: Tue, 14 Oct 2008 15:39:44 -0700
From: "Yinghai Lu" <yinghai@kernel.org>
To: donald.d.dugger@intel.com
Subject: Re: [PATCH] Enable console on PCI serial devices
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <200810142231.m9EMV95O002974@los-vmm.sc.intel.com>
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References: <200810142231.m9EMV95O002974@los-vmm.sc.intel.com>
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On Tue, Oct 14, 2008 at 3:31 PM,  <donald.d.dugger@intel.com> wrote:
> The problem with using a PCI serial card for the console is that, until
> the PCI serial driver is loaded, output will be lost.  The issue is that
> PCI serial devices use a non-standard I/O port address and sometimes use
> a non-standard crystal frequency.  This patch gets around those problems
> by allowing you to specify both I/O port address and crystal frequency on
> the kernel command line.  The serial console specification is enhanced to be:
>
>        BBBBPNF-III/CCC
>
> where BBBB is the baud rate, P is the parity, N is the number of bits,
> F is the flow control, III is the I/O port address (prefix with 0x for
> hexadecimal) and CCC is the crystal frequency.  -III and /CCC are optional
> and can be omitted although -III must be specified if you want to set
> /CCC.  For example, the option I use is:
>
>        console=ttyS0,115200-0xe880/921600

Did you check

console=uart8250,io,0xe880,115200n8

hope you can expand that to support CCC

YH
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