[meta-freescale] CAN Supprt

Sun Oct 19 14:41:54 PDT 2014

Hi Daniel,

Sorry it's taken me so long to get back to you on this. When you're enabling it, that's not quite what you should be trying to do. If you're still using dora then follow these instructions:https://community.freescale.com/docs/DOC-96367
The main part you're wanting to do is modify the mmcargs's console line to have 'can0' at the end of it, so that it's passed to the kernel.

Now if you're using daisy, it might be a bit different. You'll might have to ask whether it's still using the old kernel or if it's on 3.10.17 by default (I think it's 3.10.17 default but I may be wrong). If it's using 3.10.17 you have to tell it to use a different .dtb file which loads up the board specification telling it to use the second can port. Ask about how to do that from the u-boot prompt; I believe it's possible but as I said i don't have a board to test it out right now. What I had done I told you earlier, but that involves adding a recipe which patches the kernel to have a different default (probably completely overboard, but does work without having to fiddle around in u-boot.)

I hope that makes it a little clearer...

Morgan

Subject: RE: [meta-freescale] CAN Supprt
Date: Wed, 15 Oct 2014 15:21:57 +0530
From: daniel.ca at nestgroup.net
To: rmtm at uvic.ca

Hi Morgan,      As per your reply i’m trying to add can0 in the kernel command line(U-boot). Since I'm a fresher to deal with this, 1. could you help me to add can0 in kernel command line? When I give,       U-boot > can0       It says can0 device not found       2. My intention is to work both CAN0 and CAN1 in the 'i.mx6qsabreauto' EVK, please help me in this regard? Thanks and regards,Daniel  From: meta-freescale-bounces at yoctoproject.org [mailto:meta-freescale-bounces at yoctoproject.org] On Behalf Of Morgan McKenzie
Sent: 10 October 2014 13:35
To: meta-freescale at yoctoproject.org
Subject: Re: [meta-freescale] CAN Supprt Hi, I'm assuming you mean this board by EVK for automotive? http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=RDIMX6SABREAUTOOtherwise, it should be similar (ignore the u-boot stuff) but the imx6q Sabre Auto is the one I'm familiar with.  In my config I had+= canutils 

which isn't absolutely necessary to use can, but for debug purposes is very useful. And for u-boot I had (but this could probably just be done in u-boot prompt - I don't have access to a board right now so I can't tell you for sure), which enables the second can bus at the expense of having no ethernet connection; up to you whether you want to do it.:--- include/configs/mx6qsabreauto.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/configs/mx6qsabreauto.h b/include/configs/mx6qsabreauto.h index dbbb6f0..51fcb58 100644 --- a/include/configs/mx6qsabreauto.h +++ b/include/configs/mx6qsabreauto.h @@ -12,7 +12,7 @@ #define CONFIG_MACH_TYPE 3529 #define CONFIG_MXC_UART_BASE UART4_BASE #define CONFIG_CONSOLE_DEV "ttymxc3" -#define CONFIG_DEFAULT_FDT_FILE "imx6q-sabreauto.dtb" +#define CONFIG_DEFAULT_FDT_FILE "imx6q-sabreauto-flexcan1.dtb" #define CONFIG_MMCROOT "/dev/mmcblk0p2" #define PHYS_SDRAM_SIZE (2u * 1024 * 1024 * 1024) -- 

And in my board's kernel config I had: CONFIG_CAN_VCAN=yCONFIG_CAN_SLCAN=y(But I believe these aren't absolutely necessary - VCAN is virtual can which is incredibly useful for testing by setting it to loop back, and SLCAN I believe is for USB to Serial converters which aren't really needed here. But thought it might be useful info) 

These three things may not have all been necessary - that's just what I did to have it working. That was a while ago (may/june), but using the master branch at the time so much more recent than dora, or daisy for that matter.. but daisy should do the trick.

Once you have the board booted up try using the command 'canconfig'. If you've included canutils, you'll have candump and cansend which are very helpful for debugging, and maybe canecho as well.

To get the can buses set up this is what I had in my boot script (first a high-speed bus, second a low-speed bus):canconfig can0 bitrate 500000ifconfig can0 up canconfig can1 bitrate 33333ifconfig can1 up

And finally, this is where you can find documentation:https://www.kernel.org/doc/Documentation/networking/can.txthttp://en.wikipedia.org/wiki/SocketCAN

I hope that helps and if you need some clarification let me know and I'll do my best!

Morgan McKenzie

 > Date: Thu, 9 Oct 2014 18:49:57 -0300
> From: otavio at ossystems.com.br
> To: daniel.ca at nestgroup.net
> CC: meta-freescale at yoctoproject.org
> Subject: Re: [meta-freescale] CAN Supprt
> 
> On Wed, Oct 8, 2014 at 5:01 AM, Daniel C. A (NESTIT)
> <daniel.ca at nestgroup.net> wrote:
> > Presently im working on i.mx6 EVK for Automotive
> > application. I have used ‘fsl-image-gui’ which was Bitbaked using Yocto-dora
> > release. Since I’m worked on CAN interfaces, I got the following queries.
> >
> > 1. How to make CAN interfaces up on EVK?
> >
> > 2. Is there anything that I have to consider when I Bitbake
> > fsl-image-gui?
> >
> > 3. Has fsl-image-gui got support for basic drivers like CAN,I2c,gpio
> > driver., etc?
> >
> > 4. My intention is to test CAN Tx/Rx using CAN Analyzer and EVK, what
> > all are the steps for the same? Is there any document that I can follow?
> 
> Please check the archive, some people has posted some guidance abou
> CAN. Also I advise you to go do Daisy as Dora is very old and has a
> very old BSP release.
> 
> -- 
> Otavio Salvador O.S. Systems
> http://www.ossystems.com.br http://code.ossystems.com.br
> Mobile: +55 (53) 9981-7854 Mobile: +1 (347) 903-9750
> -- 
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