possibilities with raw flash access

Posted Aug 25, 2009 11:48 UTC (Tue) by markusw (guest, #53024)
In reply to: possibilities with raw flash access by dlang
Parent article: The trouble with discard

I'm just remembering another issue with this approach: you also need to take ECC into account. Flipping a data bit from '1' to '0' may require flipping an ECC bit back from '0' to '1'.

Thus, for such an approach to work, you'd also need to have control over the spare area, where ECC and bad block information is normally stored.

possibilities with raw flash access

Posted Aug 28, 2009 16:37 UTC (Fri) by dlang (guest, #313) [Link]

good point. if the flash device is doing ECC on the data being stored my suggestions are harder to implement if still possible.

it will depend on the level and type of the ECC, if an algorithm is in place on a per-byte level that lets the ECC bits be '1's when the data is all '1's then you could still do per-byte modifications