Banking flash

[Jon Ringle]

Nicolas Pitre wrote:
> On Thu, 6 Dec 2007, Jon Ringle wrote:
> 
> > Hi,
> >
> > We are in the process of designing a new board around the IXP435.
The
> > IXP435 has 4 Expansion bus chip selects with an address space of
16MB
> > per chip select. I can only use CS0 for flash because the other 3
CSs
> > are being used for other purposes. The challenge that we have is
that we
> > require 32MB of flash storage. One of the options that we are
> > considering is to use a GPIO pin to bank 16MB of a 32MB Intel Strata
> > flash chip at any given time to CS0's 16MB address space. I am
trying to
> > access the scope of work to be done in Linux to accomplish this and
I am
> > asking for feedback on this idea.
> 
> You will only need a custom map driver which is pretty trivial to do.

Just to be sure I looking at the right thing: I could use
drivers/mtd/maps/ixp4xx.c as a starting point for a custom map, right?

Jon