Beaglebone usb issue after first reboot

Beaglebone usb issue after first reboot

[Mark O'Donovan]

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Issue:
Beaglebone black detects usb devices on first boot after flashing sd-card.
On subsequent boots it does not.

Setup:
Yocto Project 1.5.1
linux-ti-staging 3.12.17
meta-ti = "dora:990d8f62257029e25fc2b8786155bcf5dc483659"

Using the diff command found here:
http://superuser.com/a/470876

I found the following:
diff -r CLEAN-IMAGE/etc/udev/cache.data BOOTED-IMAGE/etc/udev/cache.data
0a1
> Linux version 3.12.17 (modonovan@changanu) (gcc version 4.8.1 (GCC) ) #3
SMP PREEMPT Thu May 1 14:08:42 IST 2014console=ttyO0,115200n8
root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwaitCharacter devices:1 mem4
/dev/vc/04 tty4 ttyS5 /dev/tty5 /dev/console5 /dev/ptmx7 vcs10 misc13
input29 fb81 video4linux89 i2c90 mtd128 ptm136 pts180 usb188 ttyUSB189
usb_device247 ttySDIO248 usbmon249 ttyO250 watchdog251 ptp252 pps253
media254 rtcBlock devices:1 ramdisk259 blkext7 loop8 sd31 mtdblock65 sd66
sd67 sd68 sd69 sd70 sd71 sd128 sd129 sd130 sd131 sd132 sd133 sd134 sd135
sd179 mmc


Running the following after booting fixes the issue on the next boot:
echo "" > /etc/udev/cache.data

Is this a known issue??

Thanks
Mark

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Re: Beaglebone usb issue after first reboot

[Denys Dmytriyenko]

On Wed, May 14, 2014 at 12:38:10PM +0100, Mark O'Donovan wrote:
> Issue:
> Beaglebone black detects usb devices on first boot after flashing sd-card.
> On subsequent boots it does not.
> 
> Setup:
> Yocto Project 1.5.1
> linux-ti-staging 3.12.17
> meta-ti = "dora:990d8f62257029e25fc2b8786155bcf5dc483659"
> 
> Using the diff command found here:
> http://superuser.com/a/470876
> 
> I found the following:
> diff -r CLEAN-IMAGE/etc/udev/cache.data BOOTED-IMAGE/etc/udev/cache.data
> 0a1
> > Linux version 3.12.17 (modonovan@changanu) (gcc version 4.8.1 (GCC) ) #3
> SMP PREEMPT Thu May 1 14:08:42 IST 2014console=ttyO0,115200n8
> root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwaitCharacter devices:1 mem4
> /dev/vc/04 tty4 ttyS5 /dev/tty5 /dev/console5 /dev/ptmx7 vcs10 misc13
> input29 fb81 video4linux89 i2c90 mtd128 ptm136 pts180 usb188 ttyUSB189
> usb_device247 ttySDIO248 usbmon249 ttyO250 watchdog251 ptp252 pps253
> media254 rtcBlock devices:1 ramdisk259 blkext7 loop8 sd31 mtdblock65 sd66
> sd67 sd68 sd69 sd70 sd71 sd128 sd129 sd130 sd131 sd132 sd133 sd134 sd135
> sd179 mmc
> 
> 
> Running the following after booting fixes the issue on the next boot:
> echo "" > /etc/udev/cache.data
> 
> Is this a known issue??

Mark,

Thanks for the report! Yes, I've seen this issue before and had a workaround 
for it, but I didn't trace it to the udev cache. I'll check it again.

-- 
Denys