On Thu, 2011-08-18 at 10:33 +0800, b35...@freescale.com wrote:
> From: Liu Shuo <b35...@freescale.com>
>
> Freescale FCM controller has a 2K size limitation of buffer RAM. In order
> to support the Nand flash chip whose page size is larger than 2K bytes,
> we divide a page into multi-2K pages for MTD layer driver. In that case,
> we force to set the page size to 2K bytes. We convert the page address of
> MTD layer driver to a real page address in flash chips and a column index
> in fsl_elbc driver. We can issue any column address by UA instruction of
> elbc controller.
>
> NOTE: Due to there is a limitation of 'Number of Partial Program Cycles in
> the Same Page (NOP)', the flash chip which is supported by this workaround
> have to meet below conditions.
> 1. page size is not greater than 4KB
> 2. 1) if main area and spare area have independent NOPs:
> main area NOP : >=3
> spare area NOP : >=2
> 2) if main area and spare area have a common NOP:
> NOP : >=4
Could you please also add this kind of info to the driver code comments?
Does it also make sense to print a message if you do the emulation,
like:
pr_info("attention! emulating 2KiB NAND pages!");
--
Best Regards,
Artem Bityutskiy
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