Flash map information in device tree.

Flash map information in device tree.

[David Woodhouse]

I'd like to get rid of some of the 'map' drivers in drivers/mtd/maps/
and replace them with simple platform devices. On PPC, I'd like to do
that with nodes in the device tree, with appropriate properties:
	- physical address
	- size
	- bankwidth
	- chip probe type (CFI/JEDEC/RAM/ROM/etc)
	- partitioning information

Can we define a format for this so it can be included in the device
trees which we're presumably going to be generating for the embedded
boards which are supported by the arch/powerpc kernel?

If we can get either an updated u-boot or a boot wrapper which work on
the Wind River SBC8265 or SBC8560 boards, I might even be able to test
it myself.

-- 
dwmw2

Re: Flash map information in device tree.

[Josh Boyer]

On Fri, 2006-05-05 at 00:34 +0100, David Woodhouse wrote:
> I'd like to get rid of some of the 'map' drivers in drivers/mtd/maps/
> and replace them with simple platform devices. On PPC, I'd like to do
> that with nodes in the device tree, with appropriate properties:
> 	- physical address
> 	- size
> 	- bankwidth
> 	- chip probe type (CFI/JEDEC/RAM/ROM/etc)

Hm.  How do you deal with NAND, which really isn't any of the above and
can really depend on things like controllers, etc.

Or was this only for NOR for the time being?

> 	- partitioning information
> 
> Can we define a format for this so it can be included in the device
> trees which we're presumably going to be generating for the embedded
> boards which are supported by the arch/powerpc kernel?

Platform drivers in general would be a good starting point I think.
Then you can transition those to using the generated flat device tree,
right?

> 
> If we can get either an updated u-boot or a boot wrapper which work on
> the Wind River SBC8265 or SBC8560 boards, I might even be able to test
> it myself.

Or if anyone is ambitions and wants to get things working on a bamboo
board... :)

josh

Re: Flash map information in device tree.

[David Woodhouse]

On Thu, 2006-05-04 at 19:01 -0500, Josh Boyer wrote:
> On Fri, 2006-05-05 at 00:34 +0100, David Woodhouse wrote:
> > I'd like to get rid of some of the 'map' drivers in drivers/mtd/maps/
> > and replace them with simple platform devices. On PPC, I'd like to do
> > that with nodes in the device tree, with appropriate properties:
> > 	- physical address
> > 	- size
> > 	- bankwidth
> > 	- chip probe type (CFI/JEDEC/RAM/ROM/etc)
> 
> Hm.  How do you deal with NAND, which really isn't any of the above and
> can really depend on things like controllers, etc.
> 
> Or was this only for NOR for the time being?

Only NOR. NAND requires a little more than just "where is it?".

-- 
dwmw2