[ECOS] IO_Flash & DataFlash

Andrew Lunn andrew@lunn.ch
Tue Aug 31 11:08:00 GMT 2004

On Tue, Aug 31, 2004 at 12:06:20PM +0200, Savin Zlobec wrote:
> Hi,
> I'am writing a DataFlash driver and I would like to use it also through 
> the io_flash API,
> but it seems that the io_flash only supports 2^n block sizes (judging by 
> the calculation
> and usage of block_mask). DataFlash memory array is divided into 3 
> levels - sectors,
> blocks and pages of wich none has 2^n size. 
> Supporting this in io_flash is probably just a matter of some ifdefs in 
> read/program/erase
> functions - is this correct ? But does anything else (RedBoot, jffs2, 
> ...) also depend on
> 2^n block sizes ?

It should not be too hard to make the io_flash code work with odd size
blocks for flash. jffs2 i have no idea about, you would be better
asking dwmw2. Redboot i think uses a few masks, so would need some

I will take a look at the new flash code tonight.


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