Martin Langhoff wrote: > On Wed, Aug 5, 2009 at 11:52 PM, Albert Cahalan<[email protected]> wrote: >> BTW, note that the flash disk itself is not certain to be >> fail-safe in the face of powerloss. Neither the firmware > > Sure. In practice it seems to be extremely safe, as wedged NAND is one > thing we haven't seen in the field (or on our dev machines). And jffs2 > is designed to survive unclean shutdowns.
The XO-1.5 will not be using raw NAND, nor will it be running jffs2. There will be a microcontroller (running uneditable proprietary firmware) emulating a block device. Firmware of this type is sometimes done well, and sometimes done poorly, as regards atomicity. I would urge OLPC to search for a device whose controller firmware can be modified, but I suspect OLPC has already written off that possibility. --Ben
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