linux-kernel - Re: [PATCH] riscv: Work to remove kernel dependence on the M-extension

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Date:   Sat, 2 Apr 2022 12:18:01 +0200
From:   Pavel Machek <pavel@....cz>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Arnd Bergmann <arnd@...db.de>, michael@...haelkloos.com,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: Work to remove kernel dependence on the
 M-extension

Hi!

> >>That'd be wonderful, but unfortunately we're trending the other way --
> >>we're at the point where "words in the specification have meaning" is
> >>controversial, so trying to talk about which flavors of the
> >>specification are standard is just meaningless.  I obviously hope that
> >>gets sorted out, as we've clearly been pointed straight off a cliff for
> >>a while now, but LMKL isn't the place to have that discussion.  We've
> >>all seen this before, nobody needs to be convinced this leads to a mess.
> >>
> >>Until we get to the point where "I wrote 'RISC-V' on that potato I found
> >>in my couch" can be conclusively determined not compliant with the spec,
> >>it's just silly to try and talk about what is.
> >
> >I would argue that codifying the required extensions through kernel source
> 
> The problem here isn't the required extensions, it's that vendors can claim
> to implement an extension on hardware that doesn't exhibit any of the
> behavior the specification expresses that systems with those extensions must
> have.  The D1 is a very concrete example of this.

Sounds like someone interested should make a webpage listing available
CPUs that claim RISC-V compatibility but far short of advertised
claims?

I'd like to get RISC-V board to play with sometime soon, and some help
in what board to get would be welcome...

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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