On Tue, 2011-07-12 at 12:48 +0800, b35...@freescale.com wrote:
> + /*
> + * Hack for supporting the flash chip whose writesize is
> + * larger than 2K bytes.
> + */
> + if (mtd->writesize > 2048) {
> + elbc_fcm_ctrl->subpage_shift = ffs(mtd->writesize >> 11) - 1;
> + elbc_fcm_ctrl->subpage_mask =
> + (1 << elbc_fcm_ctrl->subpage_shift) - 1;
> + /*
> + * Rewrite mtd->writesize, mtd->oobsize, chip->page_shift
> + * and chip->pagemask.
> + */
> + mtd->writesize = 2048;
> + mtd->oobsize = 64;
> + chip->page_shift = ffs(mtd->writesize) - 1;
> + chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
> + }
So basically if the flash has 4KiB NAND pages, you are considering it as
a flash with 2KiB NAND pages. But surely this will work only if the
underlying flash has NOP 2 at least. Or even, if you consider that JFFS2
and YAFFS want to write to OOB, you need NOP 4 (2 ECC writes and 2
writes from YAFFS/JFFS2) ? So this won't work for NOP1 flashes? Isn't it
an ugly hack?
--
Best Regards,
Artem Bityutskiy
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