Re: Testing CAN on Allwinner A20 / Banana Pi

[Patrick Menschel <menschel.p@posteo.de>]

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Thanks Marc,

that works apparently.

ifconfig -a
can0      Link encap:UNSPEC  Hardware Adresse
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          NOARP  MTU:16  Metrik:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenlänge:10
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:35


Regards,
Patrick





Am 19.03.2016 um 13:33 schrieb Marc Kleine-Budde:
> On 03/19/2016 01:27 PM, Patrick Menschel wrote:
>> you mentioned that you have a running Bpi with mainline kernel.
>>
>> My question would be if you're also running mainline u-boot with device
>> tree bindings.
> 
> I'm running a u-boot, not sure which version.
> 
>> I'm now running mainline kernel from stable branch
>> compiled with sunxi_defconfig thus CAN driver is built-in and mainline
>> u-boot according to
>>
>> http://linux-sunxi.org/Mainline_Kernel_Howto
>> http://linux-sunxi.org/Mainline_U-boot
>> .
>>
>> I've added can0 entries manually to
>>
>> arch/arm/boot/dts/sun7i-a20.dtsi
>> arch/arm/boot/dts/sun7i-a20-bananapi.dts
>>
>> since they are missing in the stable branch.
>>
>> Compiling to dtb and back to dts now resolves to
>>
>> 		can@01c2bc00 {
>> 			compatible = "allwinner,sun4i-a10-can";
>> 			reg = <0x1c2bc00 0x400>;
>> 			interrupts = <0x0 0x1a 0x4>;
>> 			clocks = <0x31 0x4>;
>> 			status = "okay";
>> 			pinctrl-names = "default";
>> 			pinctrl-0 = <0x32>;
>> 		};
>>
>> That does look plausible from my perspective.
>>
>> Unfortunately I'm still missing /dev/can0 and have no clue why.
> 
> CAN devices are network devices and will not show up in "/dev". Have a
> look at:
> 
>     ifconfig -a
> 
>> If your Bpi works with legacy u-boot, I would try that next.
> 
> Marc
> 


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