[yocto] beaglebone black usb device problem (daisy)

[Daniel Groß]

Hello there,
I have successfully build several beaglebone (qt4embedded demo and
sato+mono hard float) images using yocto 1.6 (daisy) for the beagle bone
black.

However USB devices (mouse, keyboard, anything) are only found during the
first boot.

I narrowed the problem down to the file "/etc/udev/cache.data". If I remove
this file and boot again (using the serial console), USB works once for the
next boot process.

After some try and error, I was able to restart the USB enumeration by
issuing a "udevadm trigger" command again using the serial console. That
always works. To me it seems that USB root hub is not loaded by udev if the
/etc/udev/cache.data file exists.

The output of the trigger command is:
root at beaglebone:~# udevadm trigger
udevadm trigger
47401300.usb-phy supply vcc not found, using dummy regulator
47401b00.usb-phy supply vcc not found, using dummy regulator
omap_rng 48310000.rng: OMAP Random Number Generator ver. 20
root at beaglebone:~# musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver
musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned bus number 1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 2
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
usb 2-1: new low-speed USB device number 2 using musb-hdrc
input: Logitech USB Optical Mouse as
/devices/ocp.3/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb2/2-1/2-1:1.0/0003:046D:C00C.0001/input/input0
hid-generic 0003:046D:C00C.0001: input: USB HID v1.10 Mouse [Logitech USB
Optical Mouse] on usb-musb-hdrc.1.auto-1/input0

The content of the /etc/udev/cache.data file is:
root at beaglebone:~# cat /etc/udev/cache.data
cat /etc/udev/cache.data
Linux version 3.14.0-yocto-standard (daniel at daniel-ubuntu) (gcc version
4.8.2 (GCC) ) #1 PREEMPT Sat May 24 16:40:23 CEST
2014console=ttyO0,115200n8 root=/dev/mmcblk0p2 ro rootfstype=ext4
rootwaitCharacter devices:1 mem2 pty3 ttyp4 /dev/vc/04 tty5 /dev/tty5
/dev/console5 /dev/ptmx7 vcs10 misc13 input29 fb89 i2c90 mtd128 ptm136
pts180 usb189 usb_device226 drm250 ttySDIO251 ttyO252 bsg253 watchdog254
rtcBlock devices:1 ramdisk259 blkext8 sd31 mtdblock65 sd66 sd67 sd68 sd69
sd70 sd71 sd128 sd129 sd130 sd131 sd132 sd133 sd134 sd135 sd179 mmc


For the sake of completeness:
root at beaglebone:~# uname -a
uname -a
Linux beaglebone 3.14.0-yocto-standard #1 PREEMPT Sat May 24 16:40:23 CEST
2014 armv7l GNU/Linux


Did anyone else see these problems? And is this a bug - or a feature?


Daniel
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