<flokli> blackriversoftwa: basically, nix-build -A pkgsCross.armv7l-hf-multiplatform.nix should do it
<flokli> you probably need to compile a lot by yourself, and it might break from time to time, as hydra is currently not building any armv7l stuff
<blackriversoftwa> @flokli yeah I got that far
<flokli> so it builds?
<flokli> If you're thinking about compiling whole NixOS system images with it, there's some open bugs
<blackriversoftwa> nix-2.3.3 does
<blackriversoftwa> But when I bundle it up with the install script and it gets to the nix-channel setup it tries to invoke the wrong bash
<blackriversoftwa> I was able to disable channel setup since I posted
<blackriversoftwa> So I have a working single user nix install on a pi now
<blackriversoftwa> But I was trying to build nix unstable that doesn't use config.nix to find bash anymore
<blackriversoftwa> And discovered that nix's rust infra is broken for cross-compilation
<flokli> uh, fun
<blackriversoftwa> flokli thanks for coming back to me though! I've gotten something that works
<blackriversoftwa> Just no channels, which for my use case is ok
<flokli> hmm hmm
<flokli> I might be bumping in that same thing when resuming aarch64 work
<flokli> so thanks for flagging :-)
<flokli> blackriversoftwa: I opened https://github.com/NixOS/nixpkgs/issues/81153 about that
<{^_^}> #81153 (by flokli, 21 seconds ago, open): nix: cross-compilation adds native bash to the closure
<samueldr> flokli: I would invite you to cc thefloweringash and lopsided98, they're doing good work on cross-compilation stuff
<samueldr> see #79793 and #80497
<{^_^}> https://github.com/NixOS/nixpkgs/pull/79793 (by lopsided98, 2 weeks ago, open): stdenv: update ARM bootstrap tarballs
<{^_^}> https://github.com/NixOS/nixpkgs/pull/80497 (by lopsided98, 1 week ago, open): make-bootstrap-tools: add libssp to allow stack protector to work
<samueldr> (if you hadn't already)
<flokli> samueldr: good point
<flokli> done
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<gchristensen> nice to see, but bummer the top-level one isn't reduced too :)
<samueldr> it looks like they might have over-segmented and bet on the wrong device
<samueldr> in some interview it was said they expected the 2GB to be their main seller
<gchristensen> ahhhh good point
<samueldr> while it's the 4GB
<clever> Image recognition - what 4GB of memory can do
<clever> Post Reply
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<blackriversoftwa> I'm looking forward to better GPGPU support for that new embedded GPU
<clever> blackriversoftwa: the one on the rpi, or another SoC?
<blackriversoftwa> clever: on the pi4
<blackriversoftwa> My understanding is that it's significantly more powerful but the information needed to write e.g. an opencl implementation isn't public yet
<clever> blackriversoftwa: from what ive heard (havent confirmed), the QPU can run at a higher clock rate now, so they actually put fewer QPU's on the vc6
<clever> blackriversoftwa: so it can do less work in parallel, at a higher rate, giving roughly the same performance, i think
<blackriversoftwa> Interesting
<clever> blackriversoftwa: the rpi also has 2 types of compute cores
<clever> blackriversoftwa: you have the QPU's with very no branching capability (only conditional execution), and it typically runs vertex and pixel shaders
<clever> blackriversoftwa: but you also have the VPU's, which contain a 64x64x8bit matrix, and can do an ALU op on 16 pairs of values at once (and treat several cells as 8bit, 16bit, or 32bit quantities)
<clever> blackriversoftwa: i do have the ability to do custom compute jobs on the VPU, but you have to deal with context switching and sharing the core currently, for the stock firmware
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