linux-kernel - Re: [PATCH v2] mmc : general purpose partition support.

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Message-ID: <CAKYAXd-=EaG02N6f2VWO0ZNCshWp6swiT-WwpOV-p+cTDL7wwA@mail.gmail.com>
Date:	Wed, 28 Sep 2011 22:50:17 +0900
From:	NamJae Jeon <linkinjeon@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	cjb@...top.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, awarkentin@...are.com,
	adrian.hunter@...el.com, james_p_freyensee@...ux.intel.com,
	sebras@...il.com, Ulf Hansson <Ulf.Hansson@...ricsson.com>,
	Stefan Nilsson XK <stefan.xk.nilsson@...ricsson.com>,
	Per Forlin <per.forlin@...ricsson.com>,
	johan.rudholm@...ricsson.com
Subject: Re: [PATCH v2] mmc : general purpose partition support.

2011/9/28 Linus Walleij <linus.walleij@...aro.org>:
> On Sat, Sep 24, 2011 at 7:07 AM, Namjae Jeon <linkinjeon@...il.com> wrote:
>
>> It allows gerneral purpose partitions in MMC Device.
>> And I try to simpliy make mmc_blk_alloc_parts using mmc_part structure suggested by Andrei Warkentin.
>> After patching, we can see general purpose partitions like this.
>>> cat /proc/partitions
>>          179 0 847872 mmcblk0
>>          179 192 4096 mmcblk0gp4
>>          179 160 4096 mmcblk0gp3
>>          179 128 4096 mmcblk0gp2
>>          179 96  1052672 mmcblk0gp1
>
> We notice there are 32 minors between 128 and 96,
> how are these allocated?
You can insert maximum minors in menuconfig. I set to 32.
>
>>          179 64  1024 mmcblk0boot1
>>          179 32  1024 mmcblk0boot0
>
> Does this mean that each GP-partition can contain an MBR and thus several
> subpartitions so we get things like:
>
> mmcblk0gp1p1, mmcblk0gp1p2...
>
>
Yes, We can divide dos partitions(included MBR) using fdisk like your
words(mmcblk0gp1p1, mmcblk0gp1p2...)

> Yours,
> Linus Walleij
>
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