On Tuesday 29 March 2011, Andrei Warkentin wrote: > On Fri, Mar 25, 2011 at 10:14 AM, Arnd Bergmann <arnd@xxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
