linux-kernel - Re: [linux-sunxi] Re: [PATCH] ARM: dts: sun8i: r40/v40: rewrite BPi M2 Berry DTS to rebase on M2 Ultra

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Date:   Mon, 20 Aug 2018 20:06:21 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org,
        Maxime Ripard <maxime.ripard@...tlin.com>
CC:     devicetree@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        linux-sunxi@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [linux-sunxi] Re: [PATCH] ARM: dts: sun8i: r40/v40: rewrite BPi M2 Berry DTS to rebase on M2 Ultra



于 2018年8月20日 GMT+08:00 下午8:00:46, Maxime Ripard <maxime.ripard@...tlin.com> 写到:
>Hi!
>
>On Wed, Aug 08, 2018 at 06:36:56PM +0800, Icenowy Zheng wrote:
>> 在 2018-07-26四的 14:41 +0200，Maxime Ripard写道：
>> > On Wed, Jul 25, 2018 at 12:36:55AM +0800, Icenowy Zheng wrote:
>> > > Banana Pi designs the BPi M2 Berry board to be software
>compatible
>> > > with
>> > > BPi M2 Ultra,
>> > 
>> > Do you have a reference for this?
>> > 
>> > > so it's based on M2 Ultra with some function cuts, including:
>> > > 
>> > > - 2048MiB DRAM -> 1024MiB (this should be proceed by the
>> > > bootloader);
>> > > - dropped a LED;
>> > > - dropped eMMC;
>> > > - dropped USB2 and connect USB1 to a 4-port HUB.
>> > 
>> > Is it the exhaustive list?
>> 
>> I have asked Mikey from Sinovoip, and he has agreed this.
>> 
>> Here's a list provided by him, which covers some things I forgot:
>> - 2GiB -> 1GiB
>> - no eMMC
>> - no onboard microphone
>> - no IR
>> - no charging (and power jack to USB)
>> - USB change
>> - one less LED
>> 
>> Should I add this to the device tree's comment?
>
>Not really, because...
>
>> > 
>> > I'm a bit reluctant to merge that kind of patches usually, since
>that
>> > would also imply that each time someone will commit something to
>the
>> > M2-Ultra, it would automatically apply to the M2-Berry, without any
>> > easy way to tell and / or test.
>
>... this still applies.

But I think few developers will have both boards at the same time.

>
>Maxime