linux-kernel - Re: [PATCH 0/3] Add boot_enable attribute to eMMC device for boot mode operation selection

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Date:	Mon, 22 Apr 2013 09:23:58 +0200
From:	Neil Armstrong <narmstrong@...tion.com>
To:	Namjae Jeon <linkinjeon@...il.com>
CC:	linux-mmc@...r.kernel.org, Chris Ball <cjb@...top.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Subhash Jadavani <subhashj@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nam-Jae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH 0/3] Add boot_enable attribute to eMMC device for boot
 mode operation selection

On 04/22/2013 06:55 AM, Namjae Jeon wrote:
> 2013/4/19, Neil Armstrong <narmstrong@...tion.com>:
>> Since eMMC 4.3 a special boot mode operation was introduced to retrieve
>> data from the eMMC device with a very simple procedure. Since the Linux
>> kernel exports these device boot partitions, it may be useful to select
>> the boot partition from the user space.
>>
>> The patch has been tested on a Toshiba eMMC conforming with eMMC 4.5
>> specifications.
> Hi Neil.
> We can be enable boot partition using mmc-utils.
> See this address.
> https://git.kernel.org/cgit/linux/kernel/git/cjb/mmc-utils.git/commit/?id=7bd1320b2cb38f040ab5cf017d17e283496690bf
> 
> So, I don't think this patch is useful.
> If you consider to be disable boot partition, you can try to update
> mmc-utils base on the address I shared.
> 
> Thanks.
>>
>> Neil Armstrong (3):
>>   Add BOOT_PARTITION_ENABLE definition to MMC EXT_CSD PART_CONFIG
>>   Add boot_enable sysfs attribute to select MMC boot operation
>>     partition
>>   Add Documentation for MMC boot_enable attribute
>>
>>  Documentation/mmc/mmc-dev-parts.txt |    6 +++
>>  drivers/mmc/card/block.c            |   72
>> ++++++++++++++++++++++++++++++++++-
>>  include/linux/mmc/mmc.h             |    1 +
>>  3 files changed, 78 insertions(+), 1 deletions(-)
>>
>>
>>
> 

Hi,
Thanks for the reply, I was not aware of the mmc-utils tools. I think
the tool and the MMC_IOC_CMD interface should be documented in the kernel.

Please ignore my patch.

Regards,
Neil
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