MTD driver for Atmel serial flash

MTD driver for Atmel serial flash

[Derek Mulcahy]

Hi

I am developing an MTD driver for an Atmel serial flash.

The device has 264 byte pages and they can be erased and written 
individually.

I'm not sure what values to put in the mtd_info structure. I intend this 
to be used with JFFS2.

Currently I have

    mtd->name = "atmel";
    mtd->type = MTD_OTHER;
    mtd->flags = MTD_WRITEB_WRITEABLE | MTD_ERASEABLE | MTD_CLEAR_BITS | 
MTD_SET_BITS;
    mtd->size = 256 * 2048;
    mtd->read = serial_read;
    mtd->write = serial_write;
    mtd->sync = serial_sync;
    mtd->erase = serial_erase;
    mtd->erasesize = 256;

As you can see, I am hiding the extra 8 bytes per page from the MTD 
system, this makes the read/writes simpler.

An advice/pointers on the right way to do this would be much appreciated.

Cheers

Derek

Re: MTD driver for Atmel serial flash

[David Woodhouse]

derek@technicaltoys.net said:
>  As you can see, I am hiding the extra 8 bytes per page from the MTD
> system, this makes the read/writes simpler.

> An advice/pointers on the right way to do this would be much
> appreciated. 

Hmmm. Very little code is prepared to deal with erase blocks with a size 
that isn't a power of two. The best way forward is probably to pretend to 
be normal NOR flash with a larger erase size. 

--
dwmw2