linux-kernel - Re: 3.17-rc2: root=/dev/mmcblk0p2 command line parsing fails

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Date:	Tue, 26 Aug 2014 16:00:08 -0500
From:	Dinh Nguyen <dinh.linux@...il.com>
To:	Pavel Machek <pavel@...x.de>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	Dinh Nguyen <dinguyen@...era.com>,
	Kevin Hilman <khilman@...aro.org>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	arm@...nel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org
Subject: Re: 3.17-rc2: root=/dev/mmcblk0p2 command line parsing fails

On Tue, Aug 26, 2014 at 6:47 AM, Pavel Machek <pavel@...x.de> wrote:
> Hi!
>
>> > > mmc0: new SDHC card at address b368
>> > > mmcblk0: mmc0:b368 USD   7.45 GiB
>> > >  mmcblk0: p1 p2 p3 p4
>> > > VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0): error
>> > > -6
>> > > Please append a correct "root=" boot option; here are the available
>> > > partitions:
>> > > b300         7822336 mmcblk0  driver: mmcblk
>> > >   b301          102400 mmcblk0p1 00082434-01
>> > >   b302         1048576 mmcblk0p2 00082434-02
>> > >   b303            1024 mmcblk0p3 00082434-03
>> > >   b304         6086656 mmcblk0p4 00082434-04
>> > > Kernel panic - not syncing: VFS: Unable to mount root fs on
>> > > unknown-block(0,0)
>> > > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.16.0-11208-gef74117-dirty
>> > > #2
>> >
>> > Hmm...today's tip-top(899552d6) and ba36899 booted just fine for me. I
>> > noticed something, you must have commits on top of your ba36899? Mine
>> > shows 3.16.0-11149-gba36899.
>>
>> Ok, thanks for info. I went back to 3.16, and it worked in same
>> config, and went to 3.17, and it broke.
>
> The problem is still there in 3.17-rc2. 3.16 does not have the
> problem. Messages are still similar:
>
> mmc0: new high speed SDHC card at address b368
> mmcblk0: mmc0:b368 USD   7.45 GiB
>  mmcblk0: p1 p2 p3 p4
> VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0): error
> -6
> Please append a correct "root=" boot option; here are the available
> partitions:
> b300         7822336 mmcblk0  driver: mmcblk
>   b301          102400 mmcblk0p1 00082434-01
>   b302         1048576 mmcblk0p2 00082434-02
>   b303            1024 mmcblk0p3 00082434-03
>   b304         6086656 mmcblk0p4 00082434-04
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted
> 3.17.0-rc2-00368-gec0400b-dirty #83
>
>
> What is going on there? Clearly partition table was parsed and
> partitions are available; does the mention of unknown-block(0,0) mean
> that kernel failed to parse the command line?
>
> I replaced "root=/dev/mmcblk0p2" with "root=b302" and have a booting
> system.


Can you do a bisect? 3.17-rc2 booted fine for me today:

EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode
VFS: Mounted root (ext3 filesystem) on device 179:2.
Freeing unused kernel memory: 252K (c052d000 - c056c000)
random: nonblocking pool is initialized

Poky 8.0 (Yocto Project 1.3 Reference Distro) 1.3 socfpga_cyclone5 ttyS0

socfpga_cyclone5 login: root
root@...fpga_cyclone5:~# uname -a
Linux socfpga_cyclone5 3.17.0-rc2-00006-gdd7ad78 #1 SMP Tue Aug 26
15:51:56 CDT 2014 armv7l GNU/Linux

Dinh
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