[ECOS] IO_Flash & DataFlash

[Savin Zlobec]

Andrew Lunn wrote:

>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 ?
>>    
>>
>
>Hi Savin
>
>I just committed these patches which means the the flash_v2 code
>should not support arbitary size blocks. Please let me know if this
>works for the DataFlash, i've only been able to test with a synthetic
>flash driver.
>  
>
Running some tests I've come across a problem with block alignment when 
flash
start address in not a multiple of its block size, the attached patch 
solves that by
calculating the block offset from relative position (to the flash start) 
not the absolute.
Included are also a couple of typo fixes.

savin

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