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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: Serial custom speed deprecated?
Date: Thu, 24 Aug 2006 23:11:41 +0100
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To: "linux-os (Dick Johnson)" <linux-os@analogic.com>
Cc: Krzysztof Halasa <khc@pm.waw.pl>, David Woodhouse <dwmw2@infradead.org>, Stuart MacDonald <stuartm@connecttech.com>, linux-serial@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>

Ar Iau, 2006-08-24 am 16:43 -0400, ysgrifennodd linux-os (Dick Johnson):
> 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?

A lot of chips will do all sorts of interesting speeds such as 31.5Kbit
because today the clocks are themselves quite configurable.