linux-kernel - Re: [PATCH 15/19] csky: Build infrastructure

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Message-ID: <20180328034957.GA4482@guoren>
Date:   Wed, 28 Mar 2018 11:49:59 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        c-sky_gcc_upstream@...ky.com, gnu-csky@...tor.com,
        thomas.petazzoni@...tlin.com, wbx@...ibc-ng.org
Subject: Re: [PATCH 15/19] csky: Build infrastructure

Hi Arnd,

On Tue, Mar 27, 2018 at 09:38:56AM +0200, Arnd Bergmann wrote:
> Usually the way gcc handles this, either each CPU is a strict superset
> of another
> one, so you just need to specify the one with the smallest instruction set,
> or you have an option like -mcpu=generic that produces the common subset.
>
ck807 ck810 ck860 are diffrent architecture, so they can not be strict
superset and there is no option like '-mcpu=generic' in our gcc and
binutils.

I know you want one vmlinux which could run on all ck807 ck810 ck860 with
different dts-setting. But now, may I keep current design for abiv1&abiv2?

In abiv3, we will take your advice seriously.

Best Regards
 Guo Ren