linux-kernel - Re: [PATCH] Enable console on PCI serial devices

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Message-ID: <20081014230432.GA14490@xolotl.n0ano.com>
Date:	Tue, 14 Oct 2008 17:04:32 -0600
From:	n0ano@...no.com
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	donald.d.dugger@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Enable console on PCI serial devices

Alan-

Wait off a bit.  YH pointed out that early printk (I should have checked
that) already has be ability to specify a I/O address.  All I need to do
is enhance the early printk code to specify a clock frequency, I should
have that patch ready shortly.

I was kind of torn between specifying the frequency vs. the max baud rate
and went with the frequency on the off chance that some weird HW might
come out that needs a different multiplier.  I figured anybody who needs
to specify the number can do the appropriate arithmetic.

On Tue, Oct 14, 2008 at 11:53:17PM +0100, Alan Cox wrote:
> > 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:
> 
> I am sure real men would compute the equivalent baud rate for the clock by
> hand ;) This looks a sensible patch, will queue.
> 
> Now I wonder if uart_parse_options can be __init 
> 
> Alan
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-- 
Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
n0ano@...no.com
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