linux-kernel - Re: [PATCH] mmc: sdhci-esdhc-imx: Enable boot partition access from DT

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Message-ID: <CAL8zT=i-T9DHd1F5=YpovM9i0LwpUswm6am1Qyf6kG_g3Xj2Qg@mail.gmail.com>
Date:	Thu, 4 Sep 2014 11:37:00 +0200
From:	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Shawn Guo <shawn.guo@...aro.org>,
	Dong Aisheng <b29396@...escale.com>,
	Peter Griffin <peter.griffin@...aro.org>,
	"tgih.jun@...sung.com" <tgih.jun@...sung.com>,
	h80.chung@...sung.com, Chris Ball <chris@...ntf.net>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] mmc: sdhci-esdhc-imx: Enable boot partition access from DT

Hi Ulf,

> I am not sure adding a DT binding for non access to rpmb would be
> needed. At least until we heard of a similar case as Adrian describes
> but for rpmb.
>
> BTW, I just posted a patch which disabled partition scan of the boot
> area, what to you think about that?
> http://marc.info/?l=linux-mmc&m=140973496402028&w=2
>
> Finally I am also wondering whether we could and thus should, handle
> these situations entirely without using a host cap. In principle what
> we need is a more sophisticated error handling when the switch errors
> occurs, while trying to switch to the boot area/rpmb partitions. Could
> you maybe investigate that option, before we decide to add a new DT
> binding?

According to me and what Hsin-Hsiang Tseng wrote, it seems that we
should be able to have access to boot partitions if we want to give a
possibility of writing u-boot in one (or both) of them. This is the
way the i.MX6 will boot on a eMMC if I read the reference manual
correctly, but I didn't tested it yet.
But there is no need to scan those partitions at boot, as there will
probably never be a partition table inside, as you said.
All we need is providing access to mmc[n]blkpboot0 and mmc[n]blkpboot1
and a way to tell which one is used as default boot partition.

This is my point of view, but I didn't read JESD84-A441 so I don't
know if this is the good way.

Regards,
JM
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