linux-kernel - Re: (subset) [PATCH RESEND v8 0/6] riscv: add initial support for Canaan Kendryte K230

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Date: Tue, 25 Jun 2024 17:44:12 +0100
From: Conor Dooley <conor@...nel.org>
To: Yangyu Chen <cyy@...self.name>
Cc: linux-riscv@...ts.infradead.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Damien Le Moal <dlemoal@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
	devicetree@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: (subset) [PATCH RESEND v8 0/6] riscv: add initial support for
 Canaan Kendryte K230

On Wed, Jun 26, 2024 at 12:04:22AM +0800, Yangyu Chen wrote:
> 
> 
> > On Jun 19, 2024, at 18:45, Conor Dooley <conor@...nel.org> wrote:
> > 
> > On Wed, Apr 10, 2024 at 11:30:25AM +0100, Conor Dooley wrote:
> >> From: Conor Dooley <conor.dooley@...rochip.com>
> >> 
> >> On Mon, 08 Apr 2024 00:26:58 +0800, Yangyu Chen wrote:
> >>> K230 is an ideal chip for RISC-V Vector 1.0 evaluation now. Add initial
> >>> support for it to allow more people to participate in building drivers
> >>> to mainline for it.
> >>> 
> >>> This kernel has been tested upon factory SDK [1] with
> >>> k230_evb_only_linux_defconfig and patched mainline opensbi [2] to skip
> >>> locked pmp and successfully booted to busybox on initrd with this log [3].
> >>> 
> >>> [...]
> >> 
> >> Applied to riscv-dt-for-next, thanks!
> >> 
> >> [1/6] dt-bindings: riscv: Add T-HEAD C908 compatible
> >>      https://git.kernel.org/conor/c/64cbc46bb854
> >> [2/6] dt-bindings: add Canaan K230 boards compatible strings
> >>      https://git.kernel.org/conor/c/b065da13ea9c
> >> [3/6] dt-bindings: timer: Add Canaan K230 CLINT
> >>      https://git.kernel.org/conor/c/b3ae796d0a4f
> >> [4/6] dt-bindings: interrupt-controller: Add Canaan K230 PLIC
> >>      https://git.kernel.org/conor/c/db54fda11b13
> >> [5/6] riscv: dts: add initial canmv-k230 and k230-evb dts
> >>      https://git.kernel.org/conor/c/5db2c4dc413e
> > 
> > After some discussion on the k1 thread
> > (https://lore.kernel.org/all/ZnEOU7D00J8Jzy-1@xhacker/, https://lore.kernel.org/all/ZnA6pZLkI2StP8Hh@xhacker/)
> > I am going to drop this series. It's not very useful in the current
> > state and there's not really been any interest from people in getting
> > the platform to a more complete state. Jisheng made some good points in
> > the k1 thread about the missing clock controller stuff, and I think I'm
> > going to make having basic things like clocks and where applicable
> > resets and pinctrl the minimum requirement for the platforms I'm looking
> > after.
> > 
> > I've thrown these patches into my tree:
> > https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/log/?h=k230-basic
> > 
> > I do have one of these boards, but I'm fairly limited at the moment between
> > the various linux-related and work demands on my time, so it's pretty
> > unlikely that I'll do anything with it myself.
> > 
> 
> OK. I understand about this. I do some initial support for K230
> only for my evaluation purpose and propose this tree to provide
> information for others to boot up a minimal kernel and also have
> another patch [1] to have a USB node so we will able to run a distro
> like Debian over NFS rootfs by USB ethernet which is on canmv k230
> board.
> 
> But I want to say I may have no time to do further driver development.
> I have done this for my evaluation purpose to get some performance
> metrics on real RVV chips for research usage since I’m a Ph.D.
> student focused on computer architecture. I have to devote my time
> to my research work.

And thanks, in particular, for doing the initial k230 work. We've got
something that boots without having to use the vendor extensions which
is great :)

> 
> If anyone wants to do some further driver development, please don’t
> hesitate to do so. Don’t imagine I may be doing this, so you may
> do duplicate work. I’m too busy to do that.
> 
> [1] https://lore.kernel.org/linux-riscv/tencent_E9B853316D217B8D1E7CDF8288DA5E8ED908@qq.com/


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