03:13 <jelectric> I'm having trouble building the example image. I was following the instructions here: https://docs.yoctoproject.org/brief-yoctoprojectqs/index.html and I was able to get this to compile for x86-64 and run it in qemux86-64. However, I get errors when I attempt to build an image for ARM64. The only thing I did different was modify the local.conf file for MACHINE?="qemuarm64" but now the build fails.

03:18 <jelectric> specifically it fails on gcc-9.5.0-r0 do_compile

12:44 <rburton> RP: looks very much like zstd -T is threaded compression

13:52 <RP> rburton: there was something about it which didn't seem as simple as it first appeared last time I looked

14:10 <JaMa> rburton: RP: IIRC the compressed data is affected by number of threads used, so it breaks binary reproducibility

14:11 <RP> JaMa: as long as you use 2 or more threads it is deterministic iirc

14:13 <JaMa> ok, maybe that changed since last time I've looked, e.g. https://github.com/facebook/zstd/issues/999 first says "Reproducibility : For a given compression level, binary version, source data, and nb of threads, compressed data will always be the same." and later 2019 "With recent versions of zstd (v1.3.4+), the number of cores and the number of threads do not matter. -T0, -T1 (default), and generally -Tn all

14:13 <JaMa> generate the same output.

14:13 <JaMa> The only important parameters are the zstd version number, and the compression level."

14:20 <RP> JaMa: right, it did improve

16:08 <uniqdom> Hello, does u-boot provides a way to backup the system image?

16:49 <rburton> JaMa: thanks for the link

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