beagleboard/kernel

usb0 not available

Closed this issue · 4 comments

kkwekkeboom commented

I use the stock emmC flasher with custom made am335x-bone.dtb, but after building and installing a new kernel (uImage) the usb0 is missing. Therefore I can't use the serial port and ethernet over serial port.

I literally followed the instructions on http://wiki.beyondlogic.org/index.php/BeagleBoneBlack_Building_Kernel#Compiling_the_BeagleBone_Black_Kernel_2

Only adjustment is in the defconfig file:
NOWAYOUT=y

mrybczyn commented

Are you sure you have installed the modules for your new kernel? If so, try to modprobe one of the modules you'd like to have manually. If there is a problem, it will be shown.

kkwekkeboom commented

lsmod shows an empty log

journalctl | grep tty shows:

Jan 01 00:00:02 beaglebone systemd[1]: Expecting device dev-ttyGS0.device...
Jan 01 00:00:02 beaglebone systemd[1]: Expecting device dev-ttyO0.device...
Jan 01 00:00:02 beaglebone systemd-modules-load[95]: Failed to lookup alias 'ircomm-tty': Function not implemented
Jan 01 00:00:03 beaglebone systemd[1]: Found device /dev/ttyO0.
Jan 01 00:00:08 beaglebone systemd[1]: Starting Serial Getty on ttyO0...
Jan 01 00:00:08 beaglebone systemd[1]: Started Serial Getty on ttyO0.
Jan 01 00:00:08 beaglebone systemd[1]: Starting Getty on tty1...
Jan 01 00:00:08 beaglebone systemd[1]: Started Getty on tty1.
Nov 19 13:15:42 beaglebone systemd[1]: Job dev-ttyGS0.device/start timed out.
Nov 19 13:15:42 beaglebone systemd[1]: Timed out waiting for device dev-ttyGS0.device.
Nov 19 13:15:42 beaglebone systemd[1]: Dependency failed for Serial Getty on ttyGS0.
Nov 19 13:15:42 beaglebone systemd[1]: Job serial-getty@ttyGS0.service/start failed with result 'dependency'.
Nov 19 13:15:42 beaglebone systemd[1]: Job dev-ttyGS0.device/start failed with result 'timeout'.
mrybczyn commented

Empty lsmod means for me that you do not have modules installed for your kernel. Also, in the log you provided there is an error when loading a module (ircom). Are you sure that you have you installed them?

Check:
uname -a
Then if the directory with the kernel version exists in /lib/modules/.

For example, in my case:
root@beaglebone:# uname -a
Linux beaglebone 3.12.0-00080-g12cbe01 #2 SMP Mon Nov 11 16:41:45 CET 2013 armv7l GNU/Linux
root@beaglebone:# ls /lib/modules/
3.12.0/ 3.12.0-00080-g12cbe01/ 3.8.13/

The right directory is '3.12.0-00080-g12cbe01' in this case.

For reference, my lsmod at boot:
root@beaglebone:# lsmod
Module Size Used by
snd_soc_omap 2834 0
snd_pcm_dmaengine 6069 1 snd_soc_omap
snd_soc_core 120132 1 snd_soc_omap
snd_compress 7482 1 snd_soc_core
regmap_spi 1901 1 snd_soc_core
snd_pcm 77519 3 snd_soc_core,snd_soc_omap,snd_pcm_dmaengine
snd_page_alloc 5160 1 snd_pcm
snd_timer 18758 1 snd_pcm
snd 59763 4 snd_soc_core,snd_timer,snd_pcm,snd_compress
soundcore 6830 1 snd
ip_tables 10409 0
x_tables 17068 1 ip_tables
usb_f_acm 5233 1
u_serial 9720 3 usb_f_acm
g_multi 32867 0
u_rndis 8656 1 g_multi
u_ether 12362 1 g_multi
libcomposite 34542 2 usb_f_acm,g_multi
rfcomm 30313 0
ircomm_tty 17814 0
ircomm 10350 1 ircomm_tty
irda 108586 2 ircomm_tty,ircomm
ipv6 325747 12
hidp 13265 0
bluetooth 199218 4 hidp,rfcomm
autofs4 22094 2
root@beaglebone:#

kkwekkeboom commented

Ok, then my problem is solved. I did build the kernel (replaced uImage), but did not reinstall the kernel modules (they are still installed in the /lib/modules/3.8.13 directory.
uname -a
Linux beaglebone 3.8.13-00720-g6c7ba4e #1 SMP Fri Nov 8 15:49:14 CET 2013 armv7l GNU/Linux

Finally, mv 3.8.13/ 3.8.13-00720-g6c7ba4e; lsmod

Module                  Size  Used by
g_multi                55905  2 
libcomposite           15228  1 g_multi
c_can_platform          4235  0 
c_can                   7428  1 c_can_platform
can_dev                 7992  1 c_can
rfcomm                 25106  0 
mtnet7601Usta          25701  0 
mt7601Usta            753921  1 mtnet7601Usta
mtutil7601Usta         65890  2 mt7601Usta,mtnet7601Usta
ircomm_tty             14503  0 
ircomm                  8846  1 ircomm_tty
irda                   89974  2 ircomm_tty,ircomm
ipv6                  229989  8 
hidp                   10112  0 
bluetooth             146100  4 hidp,rfcomm
rfkill                 16510  1 bluetooth
autofs4                17432  2

ifconfig

ifconfig
eth0      Link encap:Ethernet  HWaddr C8:A0:30:A6:B2:4B  
          inet addr:192.168.140.113  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::caa0:30ff:fea6:b24b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:17 errors:0 dropped:7 overruns:0 frame:0
          TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2820 (2.7 KiB)  TX bytes:6991 (6.8 KiB)
          Interrupt:56 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

usb0      Link encap:Ethernet  HWaddr FE:71:71:BC:C7:77  
          inet addr:192.168.7.2  Bcast:192.168.7.3  Mask:255.255.255.252
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)