linux-kernel - Re: RFC : mmc : boot partition is set as a read-write.

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Message-ID: <CAKYAXd9=KE6wwcCQ+Khfy0N6uBizQEvoLCiu9vzbskGHtmsS4A@mail.gmail.com>
Date:	Mon, 19 Sep 2011 12:56:16 +0900
From:	NamJae Jeon <linkinjeon@...il.com>
To:	Chris Ball <cjb@...top.org>
Cc:	Linus Walleij <linus.ml.walleij@...il.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: RFC : mmc : boot partition is set as a read-write.

2011/9/19 Chris Ball <cjb@...top.org>:
> Hi,
>
> On Sun, Sep 18 2011, NamJae Jeon wrote:
>> mmc : boot partition is set as a read-write.
>>
>> There is a case that user directly update boot partition through mmcblk0boot0,1.
>> However, the current boot partition is set as a read-only.
>> I suggest that boot partition is set as a read-write if there is no
>> reason that it should be read-only.
>
> There is a reason.
>
> Documentation/mmc/mmc-dev-parts.txt:
>
> MMC Boot Partitions
> ===================
>
> Read and write access is provided to the two MMC boot partitions. Due to
> the sensitive nature of the boot partition contents, which often store
> a bootloader or bootloader configuration tables crucial to booting the
> platform, write access is disabled by default to reduce the chance of
> accidental bricking.
>
> To enable write access to /dev/mmcblkXbootY, disable the forced read-only
> access with:
>
> echo 0 > /sys/block/mmcblkXbootY/force_ro
>
> ==
> - Chris.
> --
> Chris Ball   <cjb@...top.org>   <http://printf.net/>
> One Laptop Per Child
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Hi. Chris.

There is the way you are.

Thanks a lot.
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