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Linux kernel hacker and maintainer etc.

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jarkko

Jarkko Sakkinen

Edited 1 year ago

OK, something probably pretty basic with #QEMU I need to ask.

I have this command-line, which is generated by #Keystone #RISCV #TEE build:

/home/jarkkojs/work/keystone/qemu/build/riscv64-softmmu/qemu-system-riscv64 \
   $DEBUG \
   -m 2G \
   -nographic \
   -machine virt,rom=/home/jarkkojs/work/keystone/build/bootrom.build/bootrom.bin \
   -bios /home/jarkkojs/work/keystone/build/sm.build/platform/generic/firmware/fw_payload.bin \
    \
   -netdev user,id=net0,net=192.168.100.1/24,dhcpstart=192.168.100.128,hostfwd=tcp::${HOST_PORT}-:22 \
   -device virtio-net-device,netdev=net0 \
   -device virtio-rng-pci \
   -smp $SMP

QEMU has support for #Spike, which is #CVA6 emulation.

So when I do to the above command-line simply s/virt,/spike,/g, I get this error:

$ build/scripts/run-qemu.sh
**** Running QEMU SSH on port 3617 ****
qemu-system-riscv64: Property 'spike-machine.rom' not found

How do I end up to this error message? Why does it seek a filename like that? Without rom= I can run Spike emulation but I need that bootrom for the application.

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jarkko

Jarkko Sakkinen

Reply to @jarkko
Edited 1 year ago
@bsdphk @mjg59 One innovation in this area that might be cool or even useful, would be to translate AML to eBPF and use unified interpreter for both inside kernel (perhaps). It would be useful for e.g. ACPI debugging when you could try ACPI table fixup with eBPF program... Not sure how feasible would be but if it was feasible I could see applications...
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jarkko

Jarkko Sakkinen

Reply to @jarkko
Edited 1 year ago
@bsdphk @mjg59 And stack machines are best for the task because they work for any ISA created by us (humans).
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@bsdphk @mjg59 WebAssembly because it is sort of stack machine, which sort of fits for tasks that ACPI is good for... could be any Forth alike. But since AML does its job pretty well, and we know it pretty well, I'd hate it to be switched more than I hate AML (which I don't like but I *know* it).
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jarkko

Jarkko Sakkinen

Reply to @bsdphk@fosstodon.org
@bsdphk @mjg59 It is pretty hard to see how these would map for task that AML does TBH. I'd get someone proposing eBPF based BIOS/firmware (perhaps), or even WebAssembly would make more sense in this context :-)
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jarkko

Jarkko Sakkinen

#Aalto managementin vaalitentissä paistaa ehkä eniten #demokratian:n vastaisuus, koska käsittääkseni näitä sisältöjä voi katsoa vain #X-tunnuksella. Seuraavaksi luennot instaan tai tiktokiin?
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jarkko

Jarkko Sakkinen

#Debian carries old 0.7.2 version of #neovim (even trixie), and neovim does not provide #arm64 (aka #aarch64) builds. This worked well for getting up-to-date nvim binary: https://github.com/matsuu/neovim-aarch64-appimage. I used #podman aliased as #docker.
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jarkko

Jarkko Sakkinen

I've used the one for #Linux #kernel for years but apparently there is also #LXR hosting from #Bootlin for #QEMU: https://elixir.bootlin.com/qemu/latest/source
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jarkko

Jarkko Sakkinen

aihetta sen kummemmin tuntematta niin tajunnunvirtahorinasta syyttely twitterissä on jotenkin metatasolla ironisuuden huipentuma, kuten myös "en ole lukenut väitöskirjaa, mutta...". https://www.iltalehti.fi/kotimaa/a/a5edc628-90e1-45fc-a7b0-0c7d763995b3
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jarkko

Jarkko Sakkinen

Reply to @jarkko
Also need a new one for my old Raspberry Pi 3B+ which I use to test kernel patches that use TrustZone.
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jarkko

Jarkko Sakkinen

ordered a pile of #UART TTL #USB converters. out of stash, and they tend to break down :-) i need one to get serial console to #VisionFive2 RISC-V board. #riscv
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jarkko

Jarkko Sakkinen

en #politiikka'a hirveästi seuraile, mutta onhan tämä täysin todellisuudesta iralllaan olevaa paskaa, kun pikemminkin tänne pitäisi houkutella ihmisiä töihin. enpä taida seurailla jatkossakaan, koska masennus iski heti. https://www.hs.fi/paakirjoitukset/art-2000009944529.html
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jarkko

Jarkko Sakkinen

Reply to @jarkko
Edited 1 year ago

If I had to guess it is #CSR configuration in a way or another (equivalent to #MSR’s in #x86). You actually learn #CPU architectures only through painful experiences like this, at least according to my past experience :-) Fingers crossed…

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jarkko

Jarkko Sakkinen

Reply to @jarkko
Edited 1 year ago
I got my Genesys 2 FPGA alive with an old version, and can now conclude that either OpenSBI or SM is causing the misbehavior. It is super stressing when you don't even know whether you can get something theoretically to work, and I was in that limbo for few weeks. What a relief although work is not done yet! Was not sure whether the flashed CVA6 had something wrong.
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jarkko

Jarkko Sakkinen

Reply to
Edited 1 year ago
@billyjoebowers I actually tend to put these ShaperBox as the only mixing plugin when I first construct track in order not to be overwhelmed by choices. It has pretty much those features except AI :-) ShaperBox is more like AL plugin for me, i.e. Artificial Limitation, i.e. if I don't get something to the ballpark what it has then the sound must be wrong...
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jarkko

Jarkko Sakkinen

Edited 1 year ago
I'm trying to get #Keystone #SM ongoing with #CVA6 but stuck with SM's trap handler giving me illegal instruction. I wonder how interpret these values for #mideleg and #medeleg: https://github.com/keystone-enclave/keystone/issues/374#issuecomment-1777032123 #riscv #opensbi
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jarkko

Jarkko Sakkinen

I wish I had one of those #UDOO #BOLT boards so I could test #TPM and trusted keys better with #AMD #hardware. #linux #kernel
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jarkko

Jarkko Sakkinen

is EP same as big.LITTLE with different branding? https://eclecticlight.co/2023/10/23/how-does-macos-manage-virtual-cores-on-apple-silicon/ #arm
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jarkko

Jarkko Sakkinen

#pikvm is great :-)
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jarkko

Jarkko Sakkinen

Reply to @conor
@conor @gregkh Thanks for the clarification. I'm pretty early stages on learning how whole RISC-V ecosystem works :-)
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