Debian riscv64

LatticeAnimal wrote: post #3

I don't fully understand riscv, but shouldn't this be something like `RV64GC`? Are they building for the base riscv with no isa extensions? This might be addressed somewhere in the debian docs but I didn't see it.

RV64GC is mentioned here: https://wiki.debian.org/RISC-V#Hardware_baseline_and_ABI_cho...

Re: Debian riscv64

#5

Post by LatticeAnimal » Mon, Jul 24, 2023, 1:52 AM UTC

CUViper wrote: post #4

LatticeAnimal wrote: post #3

I don't fully understand riscv, but shouldn't this be something like `RV64GC`? Are they building for the base riscv with no isa extensions? This might be addressed somewhere in the debian docs but I didn't see it.

RV64GC is mentioned here: https://wiki.debian.org/RISC-V#Hardware_baseline_and_ABI_cho...

Ah, thanks for that! I wonder how they plan to support future extensions like RV64GCV which seems to be gaining traction…

Re: Debian riscv64

#6

Post by waaveshine » Mon, Jul 24, 2023, 1:54 AM UTC

LatticeAnimal wrote: post #3

I don't fully understand riscv, but shouldn't this be something like `RV64GC`? Are they building for the base riscv with no isa extensions? This might be addressed somewhere in the debian docs but I didn't see it.

I’ve noticed a lot of projects use riscv64 as shorthand for the rv64gc ISA, especially when it’s understood that there is an MMU, maybe an FPU, privilege levels, and any other extensions that a modern OS requires.

Anyway, I did find this on the Debian website[1]. So it seems they mean rv64gc.

[1] https://wiki.debian.org/RISC-V#Hardware_baseline_and_ABI_cho...

Re: Debian riscv64

#7

Post by AndyKelley » Mon, Jul 24, 2023, 1:57 AM UTC

Great work Debian!

We already have riscv64-linux builds of Zig enabled with every CI run[1]. Happy to see that they might finally be utilized by more users soon.

[1]: https://ziglang.org/download/

Re: Debian riscv64

#8

Post by jrockway » Mon, Jul 24, 2023, 2:39 AM UTC

LatticeAnimal wrote: post #5

CUViper wrote: post #4

Earlier quoted context omitted.

RV64GC is mentioned here: https://wiki.debian.org/RISC-V#Hardware_baseline_and_ABI_cho...

Ah, thanks for that! I wonder how they plan to support future extensions like RV64GCV which seems to be gaining traction…

Would it be much different than armhf vs. armel?

Re: Debian riscv64

#9

Post by photonbeam » Mon, Jul 24, 2023, 2:57 AM UTC

waaveshine wrote: post #6

LatticeAnimal wrote: post #3

I don't fully understand riscv, but shouldn't this be something like `RV64GC`? Are they building for the base riscv with no isa extensions? This might be addressed somewhere in the debian docs but I didn't see it.

I’ve noticed a lot of projects use riscv64 as shorthand for the rv64gc ISA, especially when it’s understood that there is an MMU, maybe an FPU, privilege levels, and any other extensions that a modern OS requires. Anyway, I did find this on the Debian website[1]. So it seems they mean rv64gc. [1] https://wiki.debian.org/RISC-V#Hardware_baseline_and_ABI_cho...

Presumably Android will also chose a base minimum ISA spec for riscv software at some point. It would be tidy if they match the regular linux ecosystem

Re: Debian riscv64

#10

Post by sanxiyn » Mon, Jul 24, 2023, 3:00 AM UTC

jrockway wrote: post #8

LatticeAnimal wrote: post #5

Earlier quoted context omitted.

Ah, thanks for that! I wonder how they plan to support future extensions like RV64GCV which seems to be gaining traction…

Would it be much different than armhf vs. armel?

Note that NEON is optional for armhf, mainly to support Tegra 2. This was a big deal at the time. See https://wiki.debian.org/ArmHardFloatPort.