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From: "Chris Friesen" <cfriesen@nortel.com>
To: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
Subject: [BUG] serial base baud misdetected in 2.6.27
Date: Tue, 04 Nov 2008 12:24:45 -0600	[thread overview]
Message-ID: <4910936D.4030605@nortel.com> (raw)


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.

Thanks,

Chris

             reply	other threads:[~2008-11-04 18:24 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-04 18:24 Chris Friesen [this message]
2008-11-04 19:22 ` [BUG] serial base baud misdetected in 2.6.27 Alan Cox
2008-11-04 20:29   ` Chris Friesen
2008-11-04 20:36     ` Alan Cox
2008-11-04 21:30       ` Chris Friesen

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