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:   Wed, 08 Aug 2018 18:36:56 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     maxime.ripard@...tlin.com
Cc:     Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] Re: [PATCH] ARM: dts: sun8i: r40/v40: rewrite BPi
 M2 Berry DTS to rebase on M2 Ultra

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?

> 
> 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.
> 
> Maxime
> 
> -- 
> Maxime Ripard, Bootlin (formerly Free Electrons)
> Embedded Linux and Kernel engineering
> https://bootlin.com
>