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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAL8zT=hkvFvnrswRnQRV4LXHOUxHqTVUQDjhDnhBcRRSEFjEhA@mail.gmail.com>
Date:	Thu, 4 Sep 2014 12:33:18 +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>,
	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

2014-09-04 11:37 GMT+02:00 Jean-Michel Hautbois
<jean-michel.hautbois@...alys.com>:
> 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

BTW, here is an interesting commit from Freescale tree :
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/commit/?h=imx_3.10.17_1.0.0_ga&id=28774b788ae0de5d88045dd60cac3656c305821d

JM
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/