From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Chris Friesen <cfriesen@nortel.com>
Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
Subject: Re: [BUG] serial base baud misdetected in 2.6.27
Date: Tue, 4 Nov 2008 20:36:43 +0000 [thread overview]
Message-ID: <20081104203643.77cdfa6c@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <4910B0AD.3020802@nortel.com>
> 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 ?
next prev parent reply other threads:[~2008-11-04 20:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-04 18:24 [BUG] serial base baud misdetected in 2.6.27 Chris Friesen
2008-11-04 19:22 ` Alan Cox
2008-11-04 20:29 ` Chris Friesen
2008-11-04 20:36 ` Alan Cox [this message]
2008-11-04 21:30 ` Chris Friesen
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