[Arm-netbook] Project aims to build “fully open” SoC and dev board (was Re: lowRISC : a CPU open-sourced down to the silicon level, based on RISC-V architecture

Guillaume FORTAINE gfortaine at live.com
Fri Aug 15 14:30:34 BST 2014


> Date: Fri, 8 Aug 2014 18:58:50 +0100
> From: manuel.montezelo at gmail.com
> To: arm-netbook at lists.phcomp.co.uk
> Subject: Re: [Arm-netbook] LowRISC : a CPU open-sourced down to the silicon level, based on RISC-V architecture
> 2014-08-07 20:02 Luke Kenneth Casson Leighton:
>>On Thu, Aug 7, 2014 at 6:58 PM, Manuel A. Fernandez Montecelo
>><manuel.montezelo at gmail.com> wrote:
>>> 2014-08-07 16:33 Guillaume FORTAINE:
>>>> http://www.lowrisc.org
>>> Is this any different in concept from OpenRISC 1000 (or1k)?
>>> http://opencores.org/or1k/Main_Page
>> by a long margin: yes. OpenRISC i don't believe was ever planned to
>>run at the kinds of speeds that RISC-V plans to operate at.
>>http://riscv.org/download.html#tab_rocket shows that they are
>>producing benchmarks for operation at 1ghz. the RISC-V architecture
>>appears to be designed as 64-bit from the ground up, and there also
>>appear to be room for instruction set extensions as well:
> I do not know if there's an issue with speed limits of or1k, and it's
> true the part about 64 bits.
> There's more info here, and and interesting discussion in comments,
> look for example the comments from Jeremy Bennett comparing both:
> http://www.eetimes.com/author.asp?section_id=36&doc_id=1323406
> In short, other than the possibility that physical chips available for
> purchase might be more likely from lowrisc, there do not seem to be
> many technical differences.
>>> With or1k we have already ~6.6k architecture-dependent (that have to
>>> be compiled) source packages from Debian available, and being updated
>>> whenever they are uploaded to Debian unstable. These are readily
>>> available for simulations and for people who can synthesise this in a
>>> FPGA.
>> http://riscv.org/getting-started.html
>> full toolchain, port of qemu, and an FPGA port.
>> no debian port yet though. biiit early for that :)
> OpenRISC or1k has all of this as well, that's the reason why the
> Debian port was able to start.
> I don't know how the quality and completeness of toolchain/qemu/etc
> implementations compare, though.
> --
> Manuel
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