sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv | Matrix: #riscv:catircservices.org
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<dramforever[m]1> no
<dramforever[m]1> nobody here
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<jbe> I'm not here right now, but please leave a message after the beep
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<makendo> is 32-bit Linux-capable hardware ever a thing
<Armand|X13s> 32-bit seems pretty much dead now.
<makendo> in risc-v context i mean
<Armand|X13s> Indeed.
<makendo> rv32 and rv64 came out pretty much the same time so I think active 32-bit Linux deployments would be few
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<Armand|X13s> Even a cheapola Milk-V Duo S gets you into 64-bit territory.
<xypron> At the RISC-V Summit in Paris the no-MMU 32-bit Linux was mentioned in the context of MCUs
<makendo> last time I got my hands on RV32 processor and it's ESP32-C3
<Armand|X13s> Yeah, you might have more joy looking at the Duo S.
<makendo> hardware rv32 emulation on rv64 might still be useful to save space on pointers
<makendo> i don't know if there is any known such implementations though
<Armand|X13s> What is the technical merit of saving space on pointers?
<makendo> real life programs tend to have plenty of pointers
<kepstin> probably the main advantage is that in some pointer-heavy workloads it can improve cache utilization
<makendo> and the same amount of pointers take up half the space on 32-bit compared to 64-bit
<makendo> downside is only 4GB of address space per process
<Armand|X13s> "The C906 has up to 64KB instruction and data cache."
<Armand|X13s> ...and 512MB RAM on the Duo S. ^_^
<Armand|X13s> It's worth a look, especially at that price.
<Esmil> As a curiosity I got a board with an MCU with a proprietary DSP core and "RV32IMS zicsr zifencei" core that can run 32bit Linux with MMU. But that's mostly a curiosity right now. Other than that 32bit Linux is mostly something used to save gates on FPGA designs. If you want Linux in an ASIC I'd recommend a 64bit capable chip, and they still super cheap
<makendo> I do have a few RV64 Linux test benches, just wondering about 32-bit since RISC-V Linux has zero 32-bit-era historical baggage to care about
<Armand|X13s> Like cutting off i486 and older 586 CPUs? :P
<makendo> historical baggage: proprietary 32-bit apps on x86 running in Wine
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