linux-kernel - Re: [PATCH v1 3/3] arm64: dts: add Hi6220 mailbox node

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Date:	Tue, 25 Aug 2015 15:24:16 +0100
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	Haojian Zhuang <haojian.zhuang@...aro.org>
Cc:	Mark Rutland <mark.rutland@....com>,
	"leo.yan@...aro.org" <leo.yan@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Bintian Wang <bintian.wang@...wei.com>,
	Yiping Xu <xuyiping@...ilicon.com>,
	Wei Xu <xuwei5@...ilicon.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"guodong.xu@...aro.org" <guodong.xu@...aro.org>,
	Jian Zhang <zhangjian001@...ilicon.com>,
	Zhenwei Wang <Zhenwei.wang@...ilicon.com>,
	Haoju Mo <mohaoju@...ilicon.com>,
	Dan Zhao <dan.zhao@...ilicon.com>,
	"kongfei@...ilicon.com" <kongfei@...ilicon.com>,
	Guangyue Zeng <zengguangyue@...ilicon.com>
Subject: Re: [PATCH v1 3/3] arm64: dts: add Hi6220 mailbox node

On Tue, Aug 25, 2015 at 09:43:14PM +0800, Haojian Zhuang wrote:
> Since we discussed a lot on this, let's make a conclusion on it.
> 
> 1. UEFI could append the reserved buffer in it's memory mapping.

Yes. It needs to.

(I will let Mark comment on points 2-4.)

> 5. A patch is necessary in kernel. If efi stub feature is enabled,
>    arm kernel should not parse memory node or reserved memory buffer in
>    DT any more.

This is already the case. The stub deletes any present memory nodes and
reserved entries in drivers/firmware/efi/libstub/fdt.c:update_fdt().

Then, during setup_arch(), arch/arm64/kernel/efi.c:efi_init() calls
reserve_regions(), which adds only those memory regions available for
use by Linux as RAM to memblock.

>    Arm kernel should either fetch memory information from 
>    efi or DT.

Absolutely.

>    Currently arm kernel fetch both efi memory information and
>    reserved buffer from DTB at the same time.

No, it does not.

Regards,

Leif
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