linux-kernel - Re: [PATCH v2] wait while adding MMC host to ensure root mounts

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Date:	Fri, 15 Mar 2013 11:51:22 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	Sergey Yanovich <ynvich@...il.com>, Chris Ball <cjb@...top.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2] wait while adding MMC host to ensure root mounts

On 03/14/2013 01:08 PM, Namjae Jeon wrote:
> 2013/3/14, Sergey Yanovich <ynvich@...il.com>:
>> MMC hosts are added asynchronously. We need to wait until detect returns to
>> avoid failed root filesystem mounts.
>> ---8<---
>> VFS: Cannot open root device "mmcblk0p1" or unknown-block(0,0): error -6
>> Please append a correct "root=" boot option; here are the available
>> partitions:
>> mmc0: host does not support reading read-only switch. assuming
>> write-enable.
>> 1f00             256 mtdblock0  (driver?)
>> 1f01             256 mtdblock1  (driver?)
>> 1f02            2560 mtdblock2 mmc0: new SDHC card at address b368
>>  (driver?)
>> 1f03           29696 mtdblock3  (driver?)
>> 1f04           16384 mtdblock4 mmcblk0: mmc0:b368 USD   3.72 GiB
>>  (driver?)
>>  mmcblk0: p1
>> b300         3910656 mmcblk0  driver: mmcblk
>>   b301         3906560 mmcblk0p1 00000000-01
>> Kernel panic - not syncing: VFS: Unable to mount root fs on
>> unknown-block(0,0)
>> ---8<---
>>
>> Signed-off-by: Sergey Yanovich <ynvich@...il.com>
>> ---
> Hi.
> Have you ever tried to use rootwait or rootdelay on command line ?
> If no, You can use them.
I agreed the Namjae's suggestion..if you use the rootwait or rootdelay, it's waiting for mounting rootfs.

Best Regards,
Jaehoon Chung
> 
> Thanks.
> 

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