linux-kernel - Re: [PATCH 1/2] dt-bindings: add binding for A64 DE2 CCU with SRAM section

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Message-ID: <d62ac8b8ff9073b886ceaa9ce54e6903@aosc.io>
Date:   Mon, 16 Oct 2017 17:41:10 +0800
From:   icenowy@...c.io
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     devicetree@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: add binding for A64 DE2 CCU with SRAM
 section

在 2017-10-16 17:11，Maxime Ripard 写道：
> On Sat, Oct 14, 2017 at 08:29:24PM +0800, Icenowy Zheng wrote:
>> A64's Display Engine 2.0 needs a section of SRAM (SRAM C) to be 
>> claimed.
> 
> Why?

Allwinner didn't document this, but if the SRAM is not claimed, the
DE2 MMIO zone is totally not accessible.

It seems that Allwinner uses the SRAM C in the DE2 internally.

> 
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