The need to use E18 and E19 For CAN1 comes from the TI pinmux tool.

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> On Nov 1, 2017, at 1:19 PM, Robert Nelson <[email protected]> wrote:
> 
>> On Wed, Nov 1, 2017 at 1:14 PM, Tracy Smith <[email protected]> wrote:
>> E17 and E18 we want to use that are designated as possible CAN1 pins on the
>> BeagleBone Black schematic.
>> 
>> Not using a different overlay, using the existing 4.14 kernel and 2017 I
>> boot that Robert Nelson suggests using for the BBB. But we need to pinmux
>> for E17 and E18 because the TI pinmuxing tool finds no conflict with these
>> two pins on our custom board. I’ll go back and check the CAN1 but prior to
>> Roberts changes last week that did not use the P9 expansion header, the unit
>> pinmux used different pins CAN1 I believe.  With the P9 expansion header,
>> can’t use Roberts overlay because there is no P9 expansion header on our BBB
>> board. I’ll go back look at the pins for CAN1 prior to then P9 overlay
>> changes from last week by Robert.
> 
> What i suggested, assumed you were using a BBB.  Thus since you have a
> custom board, it's all null and void..
> 
> Use TI's pinmux tool and properly route your can signals.
> 
> Regards,
> 
> -- 
> Robert Nelson
> https://rcn-ee.com/

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