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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