Hi,
I’m running Xenomai 3.0.4 on Beaglebone Black board, which is based on
Linux kernel 4.4.59 and Debian 8. The Xenomai kernel seems to work fine,
but the problems come when I start the network services using RTnet. I
execute the following commands for modules installation:
modprobe rtnet
modprobe rt_smsc
modprobe rt_davinci_mdio
modprobe rt_ticpsw
modprobe rtpacket
modprobe rtipv4
modprobe rtudp
The dmesg output is:
[ 820.968951] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
[ 820.984963] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
[ 821.017488] libphy: 4a101000.mdio: probed
[ 821.026118] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00,
driver SMSC LAN8710/LAN8720
[ 821.046599] DT probed OK
[ 821.056832] Detected MACID = 04:a3:16:b4:3a:f0RTnet: registered rteth0
And the network device is created:
root@arm:~# /usr/xenomai/sbin/rtifconfig -a
rteth0 Medium: Ethernet Hardware address: 04:A3:16:B4:3A:F0
BROADCAST MTU: 1500
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
But if I open rteth0 device, after some seconds I get a kernel panic:
root@arm:~# /usr/xenomai/sbin/rtifconfig rteth0 up
[ 836.140204] cpsw 4a100000.ethernet: initializing cpsw version 1.12 (0)
[ 836.152252] cpsw 4a100000.ethernet: phy found : id is : 0x7c0f1
[ 839.165294] Unable to handle kernel NULL pointer dereference at virtual
address 00000004
[ 839.173524] pgd = c0004000
[ 839.176251] [00000004] *pgd=00000000
[ 839.181112] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 839.186459] Modules linked in: rtudp rtipv4 rtpacket rt_ticpsw
rt_davinci_mdio rt_smsc rtnet snd_soc_hdmi_codec omap_sham omap_aes_driver
uio_pruss omap_rng rng_core tilcdc snd_soc_davinci_mcasp snd_soc_edma
snd_soc_omap snd_soc_simple_card bridge stp llc snd_soc_core
snd_pcm_dmaengine snd_pcm snd_timer tda998x evdev snd soundcore
uio_pdrv_genirq uio usb_f_acm u_serial usb_f_ecm usb_f_rndis u_ether
libcomposite bluetooth rfkill
[ 839.224963] CPU: 0 PID: 1267 Comm: kworker/0:0 Not tainted
4.4.59-ti-xenomai-r96 #26
[ 839.232742] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 839.238885] Workqueue: events_power_efficient phy_state_machine
[ 839.244844] task: dc5f9380 ti: dc632000 task.ti: dc632000
[ 839.250283] PC is at linkwatch_urgent_event+0x70/0xc0
[ 839.255361] LR is at linkwatch_urgent_event+0x34/0xc0
[ 839.260439] pc : [<c095b484>] lr : [<c095b448>] psr: a0070013
[ 839.260439] sp : dc633e60 ip : c093a85c fp : dc633e74
[ 839.271971] r10: df928605 r9 : c1089658 r8 : 00000020
[ 839.277222] r7 : 00000007 r6 : da960000 r5 : 00000000 r4 : daadd400
[ 839.283780] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : bf318d5c
[ 839.290340] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment
none
[ 839.297510] Control: 10c5387d Table: 9c6dc019 DAC: 00000051
[ 839.303284] Process kworker/0:0 (pid: 1267, stack limit = 0xdc632220)
[ 839.309755] Stack: (0xdc633e60 to 0xdc634000)
[ 839.314139] 3e60: daadd400 da960274 dc633e94 dc633e78 c095b76c c095b420
daadd400 da960274
[ 839.322359] 3e80: da960000 00000007 dc633eac dc633e98 c096c748 c095b75c
da960224 da960274
[ 839.330579] 3ea0: dc633edc dc633eb0 c07cd5dc c096c6f8 00000000 00000000
c006ea64 da960224
[ 839.338800] 3ec0: da9ba080 df9242c0 00000000 df928600 dc633f1c dc633ee0
c005f168 c07cd190
[ 839.347020] 3ee0: dc633f04 dc633ef0 c006f29c 00000000 df9242c0 da9ba080
df9242c0 da9ba098
[ 839.355240] 3f00: df9242d4 dc632000 00000008 00000000 dc633f5c dc633f20
c005f578 c005f034
[ 839.363460] 3f20: 00000001 00000000 00000002 c0fb5140 dc633f60 00000000
da9b83c0 da9ba080
[ 839.371680] 3f40: c005f524 00000000 00000000 00000000 dc633fac dc633f60
c006575c c005f530
[ 839.379900] 3f60: 00000000 00000000 da9ba080 00000000 00000000 dc633f74
dc633f74 00000000
[ 839.388121] 3f80: 00000000 dc633f84 dc633f84 dc8ba63b da9b83c0 c0065660
00000000 00000000
[ 839.396341] 3fa0: 00000000 dc633fb0 c00114ac c006566c 00000000 00000000
00000000 00000000
[ 839.404561] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
[ 839.412781] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
9fde6861 9fde6c61
[ 839.421017] [<c095b484>] (linkwatch_urgent_event) from [<c095b76c>]
(linkwatch_fire_event+0x1c/0xbc)
[ 839.430205] [<c095b76c>] (linkwatch_fire_event) from [<c096c748>]
(netif_carrier_on+0x5c/0x74)
[ 839.438865] [<c096c748>] (netif_carrier_on) from [<c07cd5dc>]
(phy_state_machine+0x458/0x4a8)
[ 839.447452] [<c07cd5dc>] (phy_state_machine) from [<c005f168>]
(process_one_work+0x140/0x4fc)
[ 839.456027] [<c005f168>] (process_one_work) from [<c005f578>]
(worker_thread+0x54/0x4bc)
[ 839.464167] [<c005f578>] (worker_thread) from [<c006575c>]
(kthread+0xfc/0x114)
[ 839.471526] [<c006575c>] (kthread) from [<c00114ac>]
(ret_from_fork+0x18/0x2c)
[ 839.478791] Code: e5940244 e3500000 089da830 e5943240 (e5931004)
[ 839.490104] ---[ end trace 8ca322227746439d ]---
Message from syslogd@arm at Mar 2 22:40:31 ...
kernel:[ 839.181112] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Message from syslogd@arm at Mar 2 22:40:31 ...
kernel:[ 839.303284] Process kworker/0:0 (pid: 1267, stack limit =
0xdc632220[ 839.513213] Unable to handle kernel paging request at virtual
address ffffffec
It seems that the problem could be in the phy management… any idea?
Thanks in advance.
Best regards,
Nahemoth
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