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

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Date:	Tue, 4 Nov 2008 20:36:43 +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

> 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 ?

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