RISC-V Implementation

Feedback Ideas
41

How compatible is RiscV with PPC. If I think correctly, this is the low-power version of this risc?

42

Totally different. RISC-V and PowerPC are their own things.

43

https://www.eetimes.com/micro-magic-risc-v-core-claims-to-beat-apple-m1-and-arm-cortex-a9/

44

How about this one:

Itā€™s getting more and more interesting :slight_smile:

1 Like
45

@rudolfc and everyone, hereā€™s a direct link for the BeagleBoard V: https://beagleboard.org/beaglev :smiley:

46

Looks like @kallisti5 is making progress https://twitter.com/kallisti5/status/1349386676817326084?s=21

3 Likes
47

  1. http://www.micromagic.com/news/CoreMark_PressRelease.pdf
    ā€œToday (i.e. Sept 2020) Micro Magic, Inc. announced the worldā€™s fastest 64-bit RISC-V core achieving 5GHz and 13,000 CoreMarks at 1.1V. A single Micro Magic core running at 0.8V nominal delivers 11,000 CoreMarks at 4.25GHz consuming only 200mW.ā€

  2. SiFive HiFive Unmatched (Model: HF105-000. $665.00 USD, Expected: 4/2/2021)
    (Quad-core, 16GB DDR4 RAM, 32MB Quad SPI Flash Storage, 1Gb Ethernet)
    https://www.sifive.com/boards/hifive-unmatched

  3. Join the circle of friends:
    https://riscv.org/members/

48

For that beagle board some tech specs (more or less) are here:

Looked at this file there:

49

Looks like @kallisti5 has the Haiku boot loader running on RISC-V under Qemu https://twitter.com/kallisti5/status/1352769189661040640?s=21

50

I have ordered a few $6 Sipeed MAIX just to play around with. Mainly using Linuxā€¦ but if I can jump start it with Haiku, one would finally have a MCU that would be FUN.

I am also on the list for a BeagleV. Haiku on the BeagleV would be amazing.

51

I have been eyeing that. Please let us know how it is. Seems too low powered for Haiku or Linux but it might still be fun to mess with. Iā€™d like to see how far it could be taken. Certainly a little portable game system could be built with it, if not a mini computer of some sort with a smaller OS. Though I know it is geared toward IoT and AI stuff.

The BeagleV seems like it could be a proper computer and I agree Haiku would be awesome on it but I think we still have a ways to go for any non-x86 Haiku :frowning:

52

Those will run Linux (I have the MAIX Amigo), but itā€™s extremely minimal and pretty ~proprietary~ EDIT: wrong wordā€¦ Sipeed has the only open-source code for it, and itā€™s a bit sketchy still from an adoption standpoint.

If youā€™re interested in (potentially) running Haiku on a RISC-V device, here are the base requirements:

  • rv64gc ISA. (Iā€™ve heard rv64imac is a more compatible target, but there arenā€™t really any interesting rv64imac devices out there for Haikuā€¦ theyā€™re all rv64gc today. (gc has hardware floating point, while imac is software floating point)
  • 2GiB of RAM (less might work, but whereā€™s the fun in that)
  • u-boot needs to support it.

Meet those three requirements, and youā€™re golden.

1 Like
53

Hmm, Alibaba for RISC-V, anyone?

https://www.cnx-software.com/2020/11/09/xuantie-c906-based-allwinner-risc-v-processor-to-power-12-linux-sbcs/ (nov 2020)

16 core out-of-order-processing 64bitā€¦ (U8 as far as I understand). They added custom instructions as well to speed up i.e. bit-oriented processing.

1 Like
54

That one is interestingā€¦ however the memory is a bit of a limitation at 64MiB - 256MiB for a chance of running Haiku you would need at least 512MiB+ ā€¦ unless someone adds the ability for Haiku to boot to a bash text console instead of always starting app_server :thinking:

RV64GCV should be compatible with our current RV64 target though.

55

Iā€™m curious what it will turn out to be.
As http://linuxgizmos.com/risc-v-based-allwinner-chip-to-debut-on-13-linux-hacker-board/ states not all specs are clear yet, including the amount of memory possible on these chipsā€¦

56

Significant memory consumer is package_fs, running system with extracted packages require less memory.

57

Well, BeIA used to boot to a browser, so I guess anything is possible. It just hijacked the bootscript, and went down a different path.

Is it running the app_server that is the issue, or Tracker? I guess there must be a way to run a simple command line. Does any of this boot to KDL?

58

It is already possible to boot Haiku to command line, fyi.
I mean to kill app_server and everything and start consoled.

2 Likes
60

I recently wrote RISC-V disassembler in Oberon from scratch in 2 days. Source code is here. BlackBox on Haiku is needed to run. It seems to be complete but it can be inaccurate (especially FPU, llvm-objdump that I used as reference canā€™t decode FPU instructions). It can resolve symbol references and PIC stubs.

RISC-V use bit mixing a lot and I donā€™t know why. For example single continuous block is mixed into 8 (!) parts for short JAL instruction:

001 imm[11|4|9:8|10|6|7|3:1|5] 01 C.JAL (RV32)

imm := SignExtend(
	op[0] DIV ASH(1, 2) MOD ASH(1, 1)*ASH(1, 5) +
	op[0] DIV ASH(1, 3) MOD ASH(1, 3)*ASH(1, 1) +
	op[0] DIV ASH(1, 6) MOD ASH(1, 1)*ASH(1, 7) +
	op[0] DIV ASH(1, 7) MOD ASH(1, 1)*ASH(1, 6) +
	op[0] DIV ASH(1, 8) MOD ASH(1, 1)*ASH(1, 10) +
	op[0] DIV ASH(1, 9) MOD ASH(1, 2)*ASH(1, 8) +
	op[0] DIV ASH(1, 11) MOD ASH(1, 1)*ASH(1, 4) +
	op[0] DIV ASH(1, 12) MOD ASH(1, 1)*ASH(1, 11)
, 12);

DevDecRISCV

3 Likes
61

I am very excited about the prospects of SIFIve having increased its collaboration with Intel with many now speculating the latter firm might buy out the former. I wonder what the possibility is of a Risc-V based NUC (New Unit of Computing - a small form factor PC) arriving ready for Haiku R1?

The NUC would be the ideal system for intel to offer in Risc-V to test the market. Apple did produce a version of its similar Mac Mini with an iPhone M-series processor for developers prior to the release of their M1 chip. I am sure such a system would be the perfect thing for Haiku to target - maybe I get carried away but perhaps it could be offered with Haiku pre-installed?

2 Likes