On Tue, Oct 17, 2017 at 9:12 AM, Robert Berger <yocto.user.mailingl...@gmail.com> wrote: > Hi, > > Imagine you have only a limited bandwidth to your devices available for SW > update. So you would like to minimize what's uploaded (over the air) to your > devices. > > How would you do this with yocto? > > [1] and [2] might be able to do incremental updates, but maybe there are > more ideas out there. > > Like how would you get a diff between two release builds... >
Some ideas: - SquashFS with agressive compression settings can be quite impressive. I was able to reduce my image size from 650MB (uncompressed) down to maybe 120MB. This was for a complete system update though. - The new zstd algo from facebook looks promising (haven't tried it yet) and might be worth investigating, I think it is supported as a squashfs decompressor. - bsdiff can generate diffs from binary files (be carefull if diffing compressed files, i.e.: gzip --rsyncable). - there's also casync (never tried it): https://github.com/systemd/casync/ Enjoy! Marc -- _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
