On Mon, 26 March 2007 00:46:33 +0100, David Woodhouse wrote: > On Mon, 2007-03-26 at 00:55 +0200, Jörn Engel wrote: > > > although, since you can flip bits to 1 without requireing an erase you > > [ vice versa. you can flip bits to 0 without erasing. ] > > And on NAND flash you can't just do it in multiple cycles one bit at a > time. The 'tally' trick isn't viable there.
You can on NAND. ECC is done in software. And for a data structure as simple as the 'tally', foregoing ECC is not a huge problem - most bitflips are easily detected and the remaining only cause off-by-a-few on the erase count. On NOR with transparent (hardware) ECC you can't. Jörn -- Homo Sapiens is a goal, not a description. -- unknown - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
