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

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Message-ID: <4910BF0B.4070607@nortel.com>
Date:	Tue, 04 Nov 2008 15:30:51 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [BUG] serial base baud misdetected in 2.6.27

Alan Cox wrote:
>> like it's hanging off the PCI bus.  The vendor/device matches to an Exar 
>> Corp. XR17C152, which is given a base_baud of 921600 in 
>> drivers/serial/8250_pci.c.
>>
>> According to the chip specs, 921600 is correct with the default crystal 
>> and control register values.  However, other crystals can be used and 
>> there's also a control register bit to enable a prescalar which cuts the 
>> baud rate by a factor of four.  I suspect that one of these has been 
>> done on our boards.
> 
> Probably. Did your vendor have the sense to set subvendor/subdevice
> identifiers that can be used to identify that specific unit ?

No idea, but I'll look into it.  Thanks for the help.

Chris
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