# Cannot find device Can0 **URL:** \ **Category:** mangOH Green\ **Created:** [March 5, 2021, 4:44pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280 "2021-03-05T16:44:17Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![lucanazzaro](https://avatars.discourse-cdn.com/v4/letter/l/edb3f5/32.png) [@lucanazzaro](https://mangoh.discourse.group/u/lucanazzaro)\ **Post date:** [March 5, 2021, 4:44pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/1 "2021-03-05T16:44:17Z")
Hi everyone, I have a mango green with **wp7607** and I use the **Talon CAN Bus IoT** extender for Sierra mangOH IoT. Through **leaf** I imported into the profile the SDK ( **swi-wp76\_4.0.0** ) for WP76 which provides **Relase13** and **Legato 19.20.0.** I downloaded the mangOH folder from the following link [mangOH\_2-7-2019\_WP75\_R16\_OK.tar.gz - Google Drive](https://drive.google.com/file/d/1zjR14597dKWhDEb2JDqf1fXQU5CHBwDY/view) I modified the _green.sdef_ file before doing the make by uncommenting the last line that allows me to synchronize the CAN drivers. I made the _green.wp76xx.update_ file to upload to the board. I downloaded **yocto** from the following link [https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-13-components/#sthash.4Ly3Qb5k.dpbs](https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-13-components/#sthash.4Ly3Qb5k.dpbs) On the card by executing these commands as reported by the guide : [https://github.com/mangOH/mangOH/wiki/How-to-build-MCP2515-CAN-driver-for-mangOH-Green-slot-1,-9x15-based-systems](https://github.com/mangOH/mangOH/wiki/How-to-build-MCP2515-CAN-driver-for-mangOH-Green-slot-1,-9x15-based-systems). ``` echo 7> / sys / class / gpio / export echo out> / sys / class / gpio / gpio7 / direction echo 1> / sys / class / gpio / gpio7 / value mux 5 mux 16 modprobe can modprobe can-dev modprobe can-raw modprobe mcp251x ip link set can0 type can bitrate 125000 triple-sampling on ifconfig can0 up ``` i see ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/b/b63b688c7dcea6103363219083a1018b38f183cc.png) It always says it **Cannot find device "can0"** How can I solve this problem? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 2:12am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/2 "2021-03-08T02:12:38Z")
I don’t see problem to use mangoh green board with WP76 and CAN IOT card. You can try my image and script: [start\_can.sh](https://mangoh.discourse.group/uploads/short-url/pAp0w6EYU6UAuhQ0MEPz6oIZOdg.sh) (1.8 KB) : [green.wp76xx.part2.rar](https://mangoh.discourse.group/uploads/short-url/c6vg0qjU6G7bA4Auli2LpEaaepD.rar) (2.1 MB) [green.wp76xx.part1.rar](https://mangoh.discourse.group/uploads/short-url/s2D7zkMvyR7V1alGPeZJMWrw5pV.rar) (4 MB) root@swi-mdm9x28-wp:~# chmod 777 /tmp/start\_can.sh root@swi-mdm9x28-wp:~# root@swi-mdm9x28-wp:~# /tmp/start\_can.sh green 0 Unload of module can\_iot.ko has been successful. sh: write error: Device or resource busy Connecting to service … Executing 4: Turn SPI on for IoT slot 0 Success Connecting to service … Executing 15: Reset IoT slot 0 Success Load of module can\_iot.ko has been successful. root@swi-mdm9x28-wp:~# root@swi-mdm9x28-wp:~# ifconfig can0 can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 UP RUNNING NOARP MTU:16 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:10 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) root@swi-mdm9x28-wp:~# root@swi-mdm9x28-wp:~# cm info Device: WP7609 IMEI: 359782080100340 IMEISV: 6 FSN: WA803370010910 Firmware Version: SWI9X07Y\_02.28.03.05 000000 jenkins 2019/07/08 11:04:16 Bootloader Version: SWI9X07[1192.601380] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:1 cur:0 tx) bc(rx:0 tx:2) mode:FIFO slv\_addr:0x3a MSTR\_STS:0x0c1300c8 OPER:0x00000090 Y\_02.28.03.05 000000 jenkins 2019/07/08 11:04:16 [1192.617687] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:1 cur:0 tx) bc(rx:0 tx:2) mode:FIFO slv\_addr:0x3a MSTR\_STS:0x0c1300c8 OPER:0x00000090 MCU Version: 002.011 PRI Part Number (PN): 9908102 PRI Revision: 001.000 Carrier PRI Name: GENERIC Carrier PRI Revision: 002.073\_000 SKU: 1103843 Last Reset Cause: Power Down Resets Count: Expected: 14 Unexpected: 1 ---
**Author:** ![lucanazzaro](https://avatars.discourse-cdn.com/v4/letter/l/edb3f5/32.png) [@lucanazzaro](https://mangoh.discourse.group/u/lucanazzaro)\ **Post date:** [March 8, 2021, 8:59am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/3 "2021-03-08T08:59:38Z")
Your .update files don’t work ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/c/c34bc5ce898fdb50e2b83d3c6dc1b62db495ebaf.png) but i tried your script with my image ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/f/f1c3f6b9ea5660e2641a535701cbd60e133087bd.png) ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 9:03am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/4 "2021-03-08T09:03:22Z")
your image does not have the can\_iot.ko. BTW, I transfer the .update file to module by scp, and then update by “update /tmp/xxx.update” on module console. ---
**Author:** ![lucanazzaro](https://avatars.discourse-cdn.com/v4/letter/l/edb3f5/32.png) [@lucanazzaro](https://mangoh.discourse.group/u/lucanazzaro)\ **Post date:** [March 8, 2021, 9:30am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/5 "2021-03-08T09:30:15Z")
I created the image following your procedure > **[How to test CAN IOT card on WP76xx MangOH Red board.docx](https://drive.google.com/file/d/1l-uFw3N9__gKucNs8t1B95YJBBrUaGlT/view)** > > Google Drive file. > HBTW, I transfer the .update file to module by scp, and then update by “update /tmp/xxx.update” on module console. I did it. So… How do i add the file can\_iot.ko? Alternatively you can put .upgrade files that work? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 9:32am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/6 "2021-03-08T09:32:46Z")
the can\_iot.ko is inside the green.wp76xx.update file. didn’t i already put the .update file which is working for me above? ---
**Author:** ![lucanazzaro](https://avatars.discourse-cdn.com/v4/letter/l/edb3f5/32.png) [@lucanazzaro](https://mangoh.discourse.group/u/lucanazzaro)\ **Post date:** [March 8, 2021, 9:39am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/7 "2021-03-08T09:39:14Z")
> Your .update files don’t work > > ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/c/c34bc5ce898fdb50e2b83d3c6dc1b62db495ebaf.png) work for you but not for me ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 9:43am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/8 "2021-03-08T09:43:00Z")
then no idea in case we already using the same FW, maybe hardware issue on your side… ---
**Author:** ![lucanazzaro](https://avatars.discourse-cdn.com/v4/letter/l/edb3f5/32.png) [@lucanazzaro](https://mangoh.discourse.group/u/lucanazzaro)\ **Post date:** [March 8, 2021, 11:04am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/9 "2021-03-08T11:04:09Z")
The board is new also the CAN module, they arrived last week and it is the first time that I use them. I think it’s more of a configuration problem or a step that I missed. Maybe the mangOH folder I used to make the .update file is obsolete… ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/b/bccb0b01bca73ca24c951db181b4551962193e26.jpeg) ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 11:18am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/10 "2021-03-08T11:18:10Z")
Then why don’t you use the mangoh source inside my procedure which has proven to be working? ---
**Author:** ![lucanazzaro](https://avatars.discourse-cdn.com/v4/letter/l/edb3f5/32.png) [@lucanazzaro](https://mangoh.discourse.group/u/lucanazzaro)\ **Post date:** [March 8, 2021, 11:38am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/11 "2021-03-08T11:38:49Z")
I’m already using that of your procedure, I also linked it to you ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 11:40am UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/12 "2021-03-08T11:40:09Z")
Then we are using same thing in software point of view. ---
**Author:** ![gavinoimparato1](https://avatars.discourse-cdn.com/v4/letter/g/f475e1/32.png) [@gavinoimparato1](https://mangoh.discourse.group/u/gavinoimparato1)\ **Post date:** [March 8, 2021, 12:30pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/13 "2021-03-08T12:30:13Z")
Hi, I can’t get CAN driver to work. I used your script start\_can.sh but it doesn’t work. So I found in the web some scripts that have this line: ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/d/d170e2097943348ba2513ae8e4ebbcabc92f5a30.png) Do you think that it could be a problem? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 12:42pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/14 "2021-03-08T12:42:13Z")
are you using my image in mangoh green board? ---
**Author:** ![gavinoimparato1](https://avatars.discourse-cdn.com/v4/letter/g/f475e1/32.png) [@gavinoimparato1](https://mangoh.discourse.group/u/gavinoimparato1)\ **Post date:** [March 8, 2021, 1:33pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/15 "2021-03-08T13:33:55Z")
no, because I can’t unzip your file, it gives me an error ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 2:03pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/16 "2021-03-08T14:03:19Z")
Did you use winrar to unzip ---
**Author:** ![gavinoimparato1](https://avatars.discourse-cdn.com/v4/letter/g/f475e1/32.png) [@gavinoimparato1](https://mangoh.discourse.group/u/gavinoimparato1)\ **Post date:** [March 8, 2021, 2:12pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/17 "2021-03-08T14:12:38Z")
No, I use the command line on Ubuntu VM ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [March 8, 2021, 2:50pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/18 "2021-03-08T14:50:29Z")
Then maybe you try winrar in windows to unzip those 2 files ---
**Author:** ![gavinoimparato1](https://avatars.discourse-cdn.com/v4/letter/g/f475e1/32.png) [@gavinoimparato1](https://mangoh.discourse.group/u/gavinoimparato1)\ **Post date:** [March 8, 2021, 4:48pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/19 "2021-03-08T16:48:57Z")
I think I solved part of the problem, but now, when I update the yocto file on the board, I see it: ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/9/9a5be4fac2cdd42d0b6eedadd9511e9279a2ea21.png) Until now I didn’t ever have this problem, because fwupdate is clearly installed… I don’t understand why is all so difficult for me with this hardware 😖 ---
**Author:** ![lucanazzaro](https://avatars.discourse-cdn.com/v4/letter/l/edb3f5/32.png) [@lucanazzaro](https://mangoh.discourse.group/u/lucanazzaro)\ **Post date:** [March 8, 2021, 5:05pm UTC](https://mangoh.discourse.group/t/cannot-find-device-can0/6280/20 "2021-03-08T17:05:18Z")
I solved the problem with the can\_iot.ko file, I had to enable the SPI through the menuconfig, I put yocto back but the problem is the same ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/6/63c3496b4642fba45ee82dc23d118e68d82586e0.png) [Next page](https://mangoh.discourse.group/t/cannot-find-device-can0/6280.md?page=2)