From: "Stuart MacDonald" <stuartm@connecttech.com>
To: "'linux-os (Dick Johnson)'" <linux-os@analogic.com>,
'Krzysztof Halasa' <khc@pm.waw.pl>
Cc: 'Alan Cox' <alan@lxorguk.ukuu.org.uk>,
'David Woodhouse' <dwmw2@infradead.org>,
linux-serial@vger.kernel.org,
'LKML' <linux-kernel@vger.kernel.org>
Subject: RE: Serial custom speed deprecated?
Date: Fri, 25 Aug 2006 11:17:42 -0400 [thread overview]
Message-ID: <043401c6c859$9c611350$294b82ce@stuartm> (raw)
In-Reply-To: <Pine.LNX.4.61.0608241635090.13499@chaos.analogic.com>
From: On Behalf Of linux-os (Dick Johnson)
> But the baud-rates have always been some approximation that starts
> at 75 and increases by powers-of-two. This is because the hardware
> always had fixed clocks with dividers that divided by powers-of-two.
> What is the claim for the requirement of strange baud-rates set
> as an integer of dimension "baud?" Where does this requirement
> come from and what devices use these?
Perhaps you'd like to check out our products
http://www.connecttech.com/
We build a lot of custom boards that have odd clocks to generate very
odd baud rates for random serial devices. The Bxxx style has been a
thorn in my side since 1999.
Also, Oxford's 16PCI95x family has three different points of altering
the clock; the clock prescaler, the actual sample rate (which is the
classic /16 that most are used to), and the actual divisor. That can
produce pretty much any baud rate, albeit with some error.
..Stu
next prev parent reply other threads:[~2006-08-25 15:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <028a01c6c6fc$e792be90$294b82ce@stuartm>
[not found] ` <1156411101.3012.15.camel@pmac.infradead.org>
[not found] ` <m3bqqap09a.fsf@defiant.localdomain>
2006-08-24 17:41 ` Serial custom speed deprecated? Alan Cox
2006-08-24 18:51 ` Krzysztof Halasa
2006-08-24 20:43 ` linux-os (Dick Johnson)
2006-08-24 22:11 ` Alan Cox
2006-08-27 6:52 ` Rogier Wolff
2006-08-27 10:00 ` Russell King
2006-08-28 14:14 ` Stuart MacDonald
2006-08-28 20:09 ` Russell King
2006-08-29 6:20 ` Rogier Wolff
2006-08-29 7:46 ` Russell King
2006-08-25 15:17 ` Stuart MacDonald [this message]
2006-08-25 15:52 ` linux-os (Dick Johnson)
2006-08-24 22:43 ` Alan Cox
2006-08-25 10:58 ` Krzysztof Halasa
2006-08-25 15:21 ` Stuart MacDonald
2006-08-25 19:32 ` Russell King
2006-08-25 20:21 ` Stuart MacDonald
2006-08-25 20:54 ` linux-os (Dick Johnson)
2006-08-25 20:39 ` Theodore Tso
2006-08-26 12:16 ` Krzysztof Halasa
2006-08-25 15:10 ` Stuart MacDonald
2006-08-24 22:05 ` Russell King
2006-08-25 15:01 ` Stuart MacDonald
[not found] <033001c6c77a$a7d8ab10$294b82ce@stuartm>
2006-08-24 13:19 ` Alan Cox
2006-08-24 13:03 ` David Woodhouse
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