Hi,
I wish to use a Beaglebone card to read a CAN bus.
The BONE_SRM.pdf Beaglebone System Reference Manual A6 rev 0.0 states that:
"There are two can bus interfaces available on the expansion header supporting CAN
version 2 parts A and B. The TX and RX digital signals are provided. The drivers and
connectors will need to be provided on a daughter card for use."
Does this mean that I must buy an extra cape card to use a CAN bus with Beaglebone? In the TI AM335x-A8 Cortex cpu there seem to be CAN bus serial interface already.
http://www.ti.com/product/am3359#technicaldocuments
What happens in practical terms is that I have downloaded the Texas Instruments Sitara SDK ti-sdk-am335x-evm-05.05.01.00 and recompiled the kernel after adding the CONFIG_CAN_D_CAN=y flag. Yet when I call "ip link show" from the command line, there is no can0 or similarly named interface. Should it not start automagically? When I try to use the "ip link add dev can0 type can" the reply I get is:
"RTNETLINK answers: Operation not supported" a few pr_info later in the board-am335xevm.c file reveals that the d_can_init drives is not started for the Beaglebone.
So ... do I need to write my own driver for the CAN Bus in the am3359 chip itself? Or won't the can0 interface show up until a daughter card is attached?
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