linux-kernel - Re: [PATCH 00/31] Andes(nds32) Linux Kernel Port

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Date:   Thu, 9 Nov 2017 17:33:13 +0800
From:   Greentime Hu <green.hu@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Greentime <greentime@...estech.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH 00/31] Andes(nds32) Linux Kernel Port

2017-11-08 18:26 GMT+08:00 Arnd Bergmann <arnd@...db.de>:
> On Wed, Nov 8, 2017 at 6:54 AM, Greentime Hu <green.hu@...il.com> wrote:
>> This patchset adds core architecture support to Linux for Andestech's
>> N13, N15, D15, N10, D10 processor cores.
>>
>> Based on the 16/32-bit AndeStar RISC-like architecture, we designed the
>> configurable AndesCore series of embedded processor families. AndesCores
>> range from highly performance-efficient small-footprint cores for
>> microcontrollers and deeply-embedded applications to 1GHz+ cores running
>> Linux, covering general-purpose N-series cores for a wide range of computing
>> need, DSP-capable D-series cores for digital signal control,
>> instruction-extensible E-series cores for application-specific acceleration,
>> and secure S-series cores for best protection of the most valuable.
>
> I looked at the entire patch series now and commented on anything I noticed
> that could be improved, overall this looks very nice, great work!
>
> Most of my comments are about tiny details that are easy to address.
>
> I see two areas that need to be looked at carefully, and that may take a
> few more rounds to get right:
>
> - In the user space ABI, you have a couple of things that differ from the
>   normal asm-generic definitions, i.e. s few syscall entry points and some
>   types in asm/posix-types.h. I guess you did that to remain compatible
>   with an older glibc port, but IMHO this compatibility should be broken
>   in favor of having the standard ABI before the port gets merged.
>
> - For the boot interface, you need to clearly define what can be expected
>   and what cannot. This involves the presence of the l2cc, the physical
>   memory address, the built-in dtb, and probably a few more things I
>   missed. For long-term maintainability, you probably want to ensure that
>   you can build a kernel that runs on as much diverse hardware as possible.
>

Many thanks to all your feedbacks. We will prepare the V2 patch to fix
them ASAP. :)