[U-Boot-Users] "stacked" memory mapped flash assisted with GPIOs

[Haavard Skinnemoen]

On Sun, 20 Jan 2008 05:56:08 -0500
Mike Frysinger <vapier at gentoo.org> wrote:

> - have memory display / flash write commands toggle the GPIO lines
>  * pros: user interface is transparent and not confusing by making it seem 
> like 1 flash exists (think software raid 0).  able to use 1 write command and 
> the lower layers will automatically split it across multiple flashes.  should 
> work with multiple types of flashes.
>  * cons: requires modification to cmd_mem.c and cfi_flash.c.

Wouldn't it be enough to just modify the blackfin-specific implementation
of map_physmem() and unmap_physmem()? Just use some of the physical
address bits to toggle the necessary GPIO lines and return a suitable
pointer into the 4MB memory window.

Haavard