On Thu, Jul 04, 2013 at 07:39:48AM +0000, Romain Izard wrote: > Tom> +A further word of warning about using eMMC and partition tables. When > Tom> +working with SD cards we can get away with erasing small areas at a > time, > Tom> +however on eMMC we must keep erases aligned to eraseblocks and thus the > Tom> +first erase we issue will erase the partition table. > > Peter> Really? I thought eMMC behaved just like SD cards? > > Tom> Yes, really. We know what the erase block size is, and round our > Tom> commands, probably because we really have to. SD cards take care of > Tom> things for us, for better or worse. > > But why do we bother with erasing the eMMC in the first place? The erase > commands are wholly optional, and only make sense as a TRIM mechanism, > which is not our case as we will fill the memory as soon as it has been > erased. > > There is no problem in writing directly in the memory, even if it has > not been erased previously. Or is it a measure to detect interrupted > writes ?
I hadn't thought of it like that, I had been thinking of it like NAND for some reason. I'll update the instructions (and write a bunch of garbage first) and re-confirm things. Thanks! -- Tom
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