On 8 February 2011 08:39, James Cameron <[email protected]> wrote: > On Tue, Feb 08, 2011 at 01:01:36AM +1100, Sridhar Dhanapalan wrote: >> Are OS images checked for integrity by the XO before they are written >> to the flash storage? I suspect not. > > As Chris said, yes. > > The image is checked for transmission integrity *as* it is written to > the flash storage [1], not before. A transmission error will result in a > partially written internal storage. The laptop should not be used until > a successful install occurs. It may appear to work but fail later.
Ah, that makes sense. I suspected that no checking was taking place because it went straight to the writing. >> The schools we deal with don't always have reliable Internet, so some >> failsafe mechanism to prevent them from using damaged images would be >> helpful. We can't expect them to learn md5sum to check the image first >> - that is too technical. > > You should give them the option. You never know when you have a school > teacher or aid who has a clue, and it would save them repeating the huge > download. > > I suggest you capture the output after a successful fs-update for use in > your instructions, along with a comment that "anything else is bad, > please ask for help." The output is different for signed installs using > deployment keys. Fantastic advice. Thank you. Sridhar _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
