On Wed, 2007-10-03 at 17:23 +0200, ext Frantisek Dufka wrote: > Igor Stoppa wrote: > > > Bootloader, Kernel and initfs should be packaged, but technically > > nothing is preventing from reflashing them. > > > > Except that at least current version of OS keeps initfs mounted and runs > relatively critical stuff from it. In theory everything should be > already cached in RAM but still flashing mtd device while jffs2 uses it > may lead to surprises. Could be solved by copying critical binaries to > tmpfs early on boot before executing them. > > BTW documentation for next version talks about cramfs used for initfs > http://maemo.org/development/documentation/how-tos/4-x/maemo_architecture.html#Flash > Is this documentation bug or new feature? I don't know about that. Initfs should become read-only (and by any practical mean it already was: there isn't space even for deleting files!) > Perhaps we can fit more stuff > to cramfs and don't need write access so this is not bad choice > (provided it can live in NAND and handle bad blocks). But still cramfs > won't solve issue with flashing live system. Ideally we would use some "merge" fs, and for that there are several possible solutions, but I'm not woking on it, so i won't comment further to avoid mistakes. In general initfs sucks and has been used for speedups in factory. However using a file based approach could apply to initfs too (or its replacement), leaving only the kernel and bootloader to be really "flashed" without passing through the filesystem. -- Cheers, Igor Igor Stoppa <igor.stoppa at nokia.com> (Nokia Multimedia - CP - OSSO / Helsinki, Finland)
