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Re: write alignment matters?
On Fri, Jun 24, 2011 at 01:43:34AM +0200, Johnny Billquist wrote:
> >In other words, Erik is right, at least if we're talking historically.
> >Of course, at least there it's documented. (I took a quick glance
> >at the code, too -- it did appear to check for erroneous parameters,
> >though I think it just truncated the count in some drivers.)
> That's because of a hardware limitation of many controllers on a
> PDP-11. They can only start DMA to even addresses. And that in turn
> is partly because of the whole design of the PDP-11 itself. It
> really is, in many ways, a word addressable machine, and only
> partially 8-bit byte oriented.
> So I'm not sure how relevant that is for a general case. It would
> seem to be very architecture specific.
Well, the point is, more or less, that this property is/was exposed by
David A. Holland
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