linux-kernel - Re: [BUG] serial base baud misdetected in 2.6.27

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Date:	Tue, 4 Nov 2008 19:22:53 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Chris Friesen" <cfriesen@...tel.com>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [BUG] serial base baud misdetected in 2.6.27

On Tue, 04 Nov 2008 12:24:45 -0600
"Chris Friesen" <cfriesen@...tel.com> wrote:

> 
> I'm running an ATCA7101 board.  This board has two 16550 ports that get 
> detected as ttyS4 and ttyS5.
> 
> With a much earlier kernel (2.6.14) the serial port base speed is 
> correctly detected as 230400, which gives the desired 115200 when I 
> specify that on the kernel commandline.
> 
> With 2.6.16 and 2.6.27 (not sure about the intervening kernels) the 
> serial port base speed is detected as 921600, which means that I need to 
> specify 460800 on the commandline to get a real speed of 115200 (as 
> verified by an external terminal server).
> 
> Any ideas what could be causing this misdetection?  I'm having lab 
> issues right now so I can't track it down, but I'll have a go at it 
> eventually.

If this is a PCI card it may be matching against a PCI entry for a
similar card with different crystals and need the right svid/sdid adding.
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