Messages in this thread | | | Subject | Re: AVR32 architecture patch against Linux 2.6.18-rc1 available | From | David Woodhouse <> | Date | Fri, 07 Jul 2006 00:17:11 +0100 |
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On Thu, 2006-07-06 at 20:48 +0200, Haavard Skinnemoen wrote: > > With MMIO those are just a not-so-special case of memory-memory, > > surely? If the new framework doesn't support that, it probably > > _should_. > > Yes, but there are at least two important differences: > > * Hanshaking. The DMA controller must know when the peripheral has > new data available/is able to accept more data. Thus, you need to > specify which set of handshaking signals to use as well as which > direction the data is moved. > * One of the pointers often stays the same during the whole transfer.
Those are hardly esoteric features -- the same goes for just about every sane DMA controller on every architecture already. Any "generic DMA framework" which isn't entirely crack-inspired is surely going to handle it properly.
-- dwmw2
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