On Tuesday 29 March 2011, Andrei Warkentin wrote:
> On Fri, Mar 25, 2011 at 10:14 AM, Arnd Bergmann <[email protected]> wrote:
>
> I confirmed with two MMC vendors that there is no "flush". Once the
> DAT transfer completes, the data is stored on non-volatile storage as
> soon as the busy status is cleared.
>
> Reliable writes are still "more reliable" because if the DAT transfer
> is interrupted (power or reset through CMD0/CMD15 or hw pin for eMMC),
> you have predictable flash contents. So it makes sense to map REQ_FUA
> to it (and REQ_META, I would guess).
Yes, sounds good.
So I guess on MLC flash, a reliable write will go to a flash page
that does not have data in any of its paired pages.
Arnd
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