linux-kernel - Re: Build regressions/improvements in v4.9-rc1

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Message-ID: <20161027090722.3ba2badc@free-electrons.com>
Date:   Thu, 27 Oct 2016 09:07:22 +0200
From:   Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        "arnd\@arndb.de" <arnd@...db.de>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz\@infradead.org" <peterz@...radead.org>,
        "Vineet.Gupta1\@synopsys.com" <Vineet.Gupta1@...opsys.com>,
        "geert\@linux-m68k.org" <geert@...ux-m68k.org>,
        "mmarek\@suse.cz" <mmarek@...e.cz>,
        "linux-snps-arc\@lists.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: Build regressions/improvements in v4.9-rc1

Hello,

On Thu, 27 Oct 2016 10:56:02 +1100, Michael Ellerman wrote:

> > Hm... that's strange - it used to work but doesn't work with newer Buildroot...
> >
> > Anyways if something very simple (i.e. with no extra libraries) works for you just go
> > ahead and grab pre-built image that Thomas Petazzoni builds.
> >
> > That's the most recent one:
> > http://autobuild.buildroot.org/toolchains/tarballs/br-arcle-hs38-full-2016.08-613-ge98b4dd.tar.bz2  
> 
> Thanks, I grabbed that and it works for axs103_smp_defconfig:
> 
>   http://kisskb.ellerman.id.au/kisskb/buildresult/12840656/
> 
> 
> It doesn't work for axs101_defconfig, saying:
> 
>   arch/arc/Makefile:29: *** Toolchain not configured for ARCompact builds.  Stop.

axs101 is using a 770 core, while the toolchain is built for the HS38
core. I'm somewhat surprised that a single ARC toolchain cannot produce
code for both 770 and HS38, but it seems to be the case.

So you need a separate toolchain for ARC770.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com