In message <200604210853.32860.david.jander at protonic.nl> you wrote: > > What do you mean with "something bad could happen"?
System crashes. > The only thing I can think of is pulling the power plug while flash is being > erased or written. What else could go wrong? The kernel may try to (re-) load some pages of a running executable or library which is no longer available (at least not at the addresses where they used to be). The kernel will either stumble over what it believes to be a corrupted file system, or load the wrong data -> kaboom. > We do the following: system running from read-only jffs2 partition. Sometimes > that partition is remounted read-write and single files are replaced, but in > some occasions we need to upgrade the whole fs. In that case a CGI lodas the > image into a ramdisk, and the upgrade process is started. For upgrade, You *have* to unmount the old file system here. > partition, and then "dd" again to copy the image. At that point no critical > flash-read access should be requested since dd is already in cache (it's The kernel might reload any page of any running executable or library. Best regards, Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de "Logic and practical information do not seem to apply here." "You admit that?" "To deny the facts would be illogical, Doctor" -- Spock and McCoy, "A Piece of the Action", stardate unknown