Hi Khem,
There is nothing in /boot once the system has started, but if I mount
/dev/mmcblk0p1 I can see a config.txt that includes:
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
dtoverlay=mcp2515-can1,oscillator=16000000,interrupt=23
This is what I could expect.
On a quick scan, this appears to be the same as the one in
tmp/deploy/images/raspberrypi4/bootfiles - the timestamp for this file
indicated it was old, so I had manually cleaned and rebuilt rpi-bootfiles for
changes to RPI_EXTRA_CONFIG to propagate.
However, if I bring the CAN interface up:
ip link set can1 up type can bitrate 100000
and look in /proc/interrupts, I see:
66: 0 0 0 0 pinctrl-bcm2835 25 Level
spi0.0
even though can1 is on spi0.1.
--
Chris Tapp
[email protected]
www.keylevel.com
> On 4 Oct 2021, at 17:49, Khem Raj <[email protected]> wrote:
>
> can you check boot/config.txt and see fi your changes are there in your
> target ?
>
> On Mon, Oct 4, 2021 at 1:21 AM Chris Tapp <[email protected]> wrote:
>>
>> Sorry, I meant to add that I have tried adding the following to local.conf:
>>
>> RPI_EXTRA_CONFIG = ' \n \
>> dtparam=spi=on \n \
>> dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25 \n \
>> dtoverlay=mcp2515-can1,oscillator=16000000,interrupt=23 \n \
>> '
>>
>> However, this did not make any difference to the interrupts.
>>
>> Since then, I have manually changed mcp2515-can1-overlay.dts in the kernel
>> build tree (after running bitbake - c do_configure virtual/kernel) and
>> rebuilt the kernel / image. This does result in the interrupt mapping
>> changing, and both CAN channels then operate correctly.
>>
>> Does anyone know why RPI_EXTRA_CONFIG doesn’t appear to be taking effect?
>>
>> --
>>
>> Chris Tapp
>> [email protected]
>> www.keylevel.com
>>
>> ----
>> You can tell you're getting older when your car insurance gets real cheap!
>>
>> On 1 Oct 2021, at 22:38, Chris Tapp <[email protected]> wrote:
>>
>> I am having trouble getting the Waveshare 2-CH CAN HAT working with an RPI4.
>> Channel 0 does not come up, channel 1 does, but it will only send one
>> message (eventually reporting "write: No buffer space available”) and not
>> receive anything.
>>
>> Looking at the mcp2515-can0-overlay.dts and mcp2515-can1-overlay.dts device
>> tree files in
>> /tmp/work-shared/raspberrypi4/kernel-source/arch/arm/boot/dts/overlays/, it
>> looks as if the interrupts are not mapped as required for the board.
>>
>> DTS HAT
>> CAN0 brcm,pins = <25> PIN23
>> CAN1 brcm,pins = <25> PIN25
>>
>> This doesn’t look right, and seems consistent with the behaviour I am seeing.
>>
>> I would also like to check the device chip select signals, but I can't see
>> how (if) they are mapped in the dts files.
>>
>> How can I override these settings when I build the image?
>>
>> --
>>
>> Chris Tapp
>> [email protected]
>> www.keylevel.com
>>
>>
>>
>>
>>
>>
>>
>>
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