* Related to mounting USB
@ 2011-12-19 10:41 Navani Kamal Srivastava
2011-12-19 19:39 ` Wolfgang Denk
0 siblings, 1 reply; 2+ messages in thread
From: Navani Kamal Srivastava @ 2011-12-19 10:41 UTC (permalink / raw
To: yocto@yoctoproject.org
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Hi,
I am facing problem in mounting USB. At the time of system bootup if USB stick is plugged, it shows messages like
"scsi 0:0:0:0: Direct-Access JetFlash Transcend 8GB 8.07 PQ: 0 ANSI: 2
sd 0:0:0:0: [sda] 15654912 512-byte logical blocks: (8.01 GB/7.46 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Assuming drive cache: write through
sd 0:0:0:0: [sda] Assuming drive cache: write through
sda: sda1
sd 0:0:0:0: [sda] Assuming drive cache: write through
sd 0:0:0:0: [sda] Attached SCSI removable disk
PHY: 0:01 - Link is Up - 100/Full"
But I won't get any sda or sda1 in /dev to mount. If I am unplugging the USB stick and again plug it I would be able to look for it in /dev and mount it. Please look after this issue.
Thanks & Regards,
Navani Kamal Srivastava
Larsen & Toubro Limited
www.larsentoubro.com<http://www.larsentoubro.com/>
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Related to mounting USB
2011-12-19 10:41 Related to mounting USB Navani Kamal Srivastava
@ 2011-12-19 19:39 ` Wolfgang Denk
0 siblings, 0 replies; 2+ messages in thread
From: Wolfgang Denk @ 2011-12-19 19:39 UTC (permalink / raw
To: Navani Kamal Srivastava; +Cc: yocto@yoctoproject.org
Dear Navani Kamal Srivastava,
In message <9BACABF0C6B14A4D8C33B42A795119BE096D7BA7@POCITMSEXMB03.LntUniverse.com> you wrote:
>
> I am facing problem in mounting USB. At the time of system bootup if
> USB stick is plugged, it shows messages like
...
> But I won't get any sda or sda1 in /dev to mount. If I am
> unplugging the USB stick and again plug it I would be able to look
> for it in /dev and mount it. Please look after this issue.
This is a known problem. Some even call it a feature ;-)
Yocto tries to speedup the boot process by caching the /dev contents:
it creates an archive "/etc/dev.tar" on the first boot and, if this
archive exists during the next boot, it gets extracted and most of
the coldplug events are filtered. Only if the archive doesn't exist a
full scan is performed.
This seems to be a good solution for a root file system used inside a
typical embedded device (as scanning for cold plug events is known to
be slow) but this clearly doesn't work in your setup where the booted
configuration changes.
As a workaround you just need to remove the "/etc/dev.tar" file from
the root file system.
As a real fix you might want to disable this functionality for
your configuration.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
The only time the world beats a path to your door is when you are in
the bathroom.
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2011-12-19 10:41 Related to mounting USB Navani Kamal Srivastava
2011-12-19 19:39 ` Wolfgang Denk
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