From: "Chris Friesen" <cfriesen@nortel.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
Subject: Re: [BUG] serial base baud misdetected in 2.6.27
Date: Tue, 04 Nov 2008 15:30:51 -0600 [thread overview]
Message-ID: <4910BF0B.4070607@nortel.com> (raw)
In-Reply-To: <20081104203643.77cdfa6c@lxorguk.ukuu.org.uk>
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
prev parent reply other threads:[~2008-11-04 21:30 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
2008-11-04 21:30 ` Chris Friesen [this message]
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