[PATCH v3 0/8] Add the Quadspi driver for vf610-twr

[David Woodhouse]

On Tue, 2013-09-17 at 20:13 +0100, Mark Brown wrote:
> 
> > [ potential "LUT" optimization, implementation details ]
> 
> AFAICT the big issue with the LUTs in this controller is that they are
> expensive to reprogram so things are going to work better if there is a
> small set of known operations that will happen repeatedly.  Otherwise
> walking the transfer list at runtime isn't too hard.

I think you can drop the word "known" there. With decent management of
the LUT as a kind of LRU cache of recent operations, surely you'll
quickly get into a situation where the operations you're actually
*doing* on the flash are all already in the LUT and you're never
actually *having* to reprogram it?

You don't need to have them set up in advance. Although once you have it
correctly doing the LUT management at runtime, sticking some expected
operations into the LUT at startup in *anticipation* can't hurt. But
let's not talk about that yet.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse at intel.com                              Intel Corporation
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