Banking flash

[Nicolas Pitre]

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.


Nicolas