Yes you are right, it is not a good idea to overwrite working cramfs filesystem. But what happens if I download the new cramfs plus kernel in RAM, do a checksum and then, completely in kernel mode, disabling all the interrupts, I write to flash? No process could complain that I am overwriting because no one is executing.
Bye, Antonio. On Wednesday 19 April 2006 09:42, Wojciech Kromer wrote: > Dnia 2006-04-06 22:38, U?ytkownik Antonio Di Bacco napisa?: > > Hi, > > > > how could I upgrade my cramfs rootfs? I have a CGI in the rootfs that > > receives the new rootfs from a web interface and then tries to write it > > in the flash. While overwriting the old cramfs, the CGI will continue to > > work? something weird could happen? > > Generally it's not a good idea to override working filesystem ( I've > tried to do it once). > > You can have two separate copies of filesystem, one to work with, and > another to overwrite, it requires more flash. > Another way is working in initrd, it requires more RAM. > You can also use jffs2 or jffs3 (experimental) to have read-write > filesystem, and change applications only, not whole filesystem (be > carefull with changing busybox or libraries!)
