i.MX Processors中的主题 Can't open can0 device at MX6Q board

Can't open can0 device at MX6Q board

andreyperminov — Fri, 16 Aug 2013 09:59:38 GMT

I try to use CAN with my MX6Q board.

When I try to initialise the device, I got error "cannot find device can0"

root@variscite ~$ uname -a

Linux variscite 3.0.35-IMX6.VAR_R11 #4 SMP PREEMPT Tue Jul 9 13:54:41 IDT 2013 armv7l GNU/Linux

root@variscite ~$ dmesg | grep can

vcan: Virtual CAN interface driver

flexcan netdevice driver

can: controller area network core (rev 20090105 abi 8)

can: raw protocol (rev 20090105)

can: broadcast manager protocol (rev 20090105 t)

root@variscite ~$ ifconfig can0 up

ifconfig: SIOCGIFFLAGS: No such device

root@variscite ~$

root@variscite ~$ ifconfig can0

ifconfig: can0: error fetching interface information: Device not found

root@variscite ~$ ls

canconfig candump canecho cansend cansequence

root@variscite ~$ ./canconfig can0 baudrate 120000rate 120000rate 120000rate 120000irate 120000trate 120000rate 120000

Cannot find device "can0"

failed to set bitrate of can0 to 120000

root@variscite ~$

How can I enable CAN support at my MX6Q board?

Re: Can't open can0 device at MX6Q board

rickchu — Mon, 19 Aug 2013 02:38:02 GMT

1. make sure imx6q_add_flexcan0(&mx6q_sabresd_flexcan0_pdata); have add in mx6_sabresd_board_init()

2. used below command to enable CAN0 device

# ip link set can0 up type can bitrate 500000

PS. I verified on our device not EVB.

Good Luck,

Rick

Re: Can't open can0 device at MX6Q board

andreyperminov — Mon, 09 Sep 2013 11:08:58 GMT

Rick,

Thank you for your answer. You have pointed me out the right direction. I use MX6-based board from Variscite. By default, imx6q_add_flexcan1(&mx6q_flexcan1_pdata); was ommited in in mx6_var_som_board_init() function. I added it in initialization code and now all work well.