linux-kernel - Re: [PATCH V3 00/26] C-SKY(csky) Linux Kernel Port

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Date:   Fri, 7 Sep 2018 14:40:52 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, daniel.lezcano@...aro.org,
        jason@...edaemon.net, arnd@...db.de, c-sky_gcc_upstream@...ky.com,
        gnu-csky@...tor.com, thomas.petazzoni@...tlin.com,
        wbx@...ibc-ng.org, green.hu@...il.com
Subject: Re: [PATCH V3 00/26] C-SKY(csky) Linux Kernel Port

On Thu, Sep 06, 2018 at 07:08:18PM -0700, Guenter Roeck wrote:
> Hi,
> 
> On Wed, Sep 05, 2018 at 08:07:39PM +0800, Guo Ren wrote:
> > This is the 3th version patchset to add the Linux kernel port for C-SKY(csky).
> > Thanks to everyone who provided feedback on the previous version.
> > 
> > This patchset adds architecture support to Linux for C-SKY's 32-bit embedded
> > CPU cores and the patches are based on linux-4.18.4
> > 
> > There are two ABI versions with several CPU cores in this patchset:
> >   ABIv1: ck610 (16-bit instruction, 32-bit data path, VIPT Cache ...)
> >   ABIv2: ck807 ck810 ck860 (16/32-bit variable length instruction, PIPT Cache,
> > 	 SMP ...)
> > 
> 
> My key question is about upstream toolchain support.
> The buildroot clone tells me
> 
> $ git describe csky/master
> 2017.11-2111-ge9cc5a5
> 
> and
> 
> $ git log --oneline origin/master..csky/master  | wc
>    1180    7436   57104
> 
> with
> $ git remote -v
> csky	https://gitlab.com/c-sky/buildroot.git 
> origin	git://git.buildroot.net/buildroot
> 
> So it looks like there are more thasn a thousand patches on top of
> buildroot. Adding an architecture to buildroot should only take a
> single patch, or maybe a few, but not more than a thousand.
> This strongly suggests that a lot of changes are not upstream
> but only available in the buildroot clone.
  csky	https://gitlab.com/c-sky/buildroot.git is our CI environment
  based on buildroot and it's so miscellaneous.
  We won't upstream it directly and we'll prepare another patch set for
  buildroot.org update after kernel, glibc upstreamed.
 
> When are we going to see all those changes in upstream gcc, binutils,
> and qemu ? I don't really want to dig through more than a thousand
> patches in a buildroot clone to find out details about the status
> of upstream toolchain support.
  Ok, you want to use upstream gcc, binutils to build the kernel. I'll
  give the tips in next version patch.

Best Regards
 Guo Ren