Disk layout for XO-1.5

Benjamin M. Schwartz bmschwar at fas.harvard.edu
Thu Aug 6 10:30:38 EDT 2009

Martin Langhoff wrote:
> On Wed, Aug 5, 2009 at 11:52 PM, Albert Cahalan<acahalan at gmail.com> 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.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 198 bytes
Desc: OpenPGP digital signature
URL: <http://lists.laptop.org/pipermail/devel/attachments/20090806/f0647f8b/attachment.sig>

More information about the Devel mailing list