* Re: [yocto] Meta-raspberrypi - how to configure device tree for MCP251x [not found] <16AA05EDD73208C2.24161@lists.yoctoproject.org> @ 2021-10-04 8:21 ` Chris Tapp 2021-10-04 16:49 ` Khem Raj 0 siblings, 1 reply; 3+ messages in thread From: Chris Tapp @ 2021-10-04 8:21 UTC (permalink / raw) To: yocto [-- Attachment #1: Type: text/plain, Size: 2301 bytes --] 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 opensource@keylevel.com 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 <opensource@keylevel.com> 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 > opensource@keylevel.com <mailto:opensource@keylevel.com> > www.keylevel.com > > > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > View/Reply Online (#54927): https://lists.yoctoproject.org/g/yocto/message/54927 > Mute This Topic: https://lists.yoctoproject.org/mt/86011706/3617534 > Group Owner: yocto+owner@lists.yoctoproject.org > Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [opensource@keylevel.com] > -=-=-=-=-=-=-=-=-=-=-=- > [-- Attachment #2: Type: text/html, Size: 6291 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [yocto] Meta-raspberrypi - how to configure device tree for MCP251x 2021-10-04 8:21 ` [yocto] Meta-raspberrypi - how to configure device tree for MCP251x Chris Tapp @ 2021-10-04 16:49 ` Khem Raj 2021-10-04 22:07 ` Chris Tapp 0 siblings, 1 reply; 3+ messages in thread From: Khem Raj @ 2021-10-04 16:49 UTC (permalink / raw) To: Chris Tapp; +Cc: Yocto-mailing-list 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 <opensource@keylevel.com> 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 > opensource@keylevel.com > 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 <opensource@keylevel.com> 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 > opensource@keylevel.com > www.keylevel.com > > > > > > > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > You automatically follow any topics you start or reply to. > View/Reply Online (#54936): https://lists.yoctoproject.org/g/yocto/message/54936 > Mute This Topic: https://lists.yoctoproject.org/mt/86011706/1997914 > Group Owner: yocto+owner@lists.yoctoproject.org > Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [raj.khem@gmail.com] > -=-=-=-=-=-=-=-=-=-=-=- > ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [yocto] Meta-raspberrypi - how to configure device tree for MCP251x 2021-10-04 16:49 ` Khem Raj @ 2021-10-04 22:07 ` Chris Tapp 0 siblings, 0 replies; 3+ messages in thread From: Chris Tapp @ 2021-10-04 22:07 UTC (permalink / raw) To: Khem Raj; +Cc: Yocto-mailing-list [-- Attachment #1: Type: text/plain, Size: 3573 bytes --] 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 opensource@keylevel.com www.keylevel.com > On 4 Oct 2021, at 17:49, Khem Raj <raj.khem@gmail.com> 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 <opensource@keylevel.com> 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 >> opensource@keylevel.com >> 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 <opensource@keylevel.com> 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 >> opensource@keylevel.com >> www.keylevel.com >> >> >> >> >> >> >> -=-=-=-=-=-=-=-=-=-=-=- >> Links: You receive all messages sent to this group. >> You automatically follow any topics you start or reply to. >> View/Reply Online (#54936): https://lists.yoctoproject.org/g/yocto/message/54936 >> Mute This Topic: https://lists.yoctoproject.org/mt/86011706/1997914 >> Group Owner: yocto+owner@lists.yoctoproject.org >> Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [raj.khem@gmail.com] >> -=-=-=-=-=-=-=-=-=-=-=- >> [-- Attachment #2: Type: text/html, Size: 7699 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-10-04 8:21 ` [yocto] Meta-raspberrypi - how to configure device tree for MCP251x Chris Tapp
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