Converting a 7i76e config to 7c81/7i76 pair
28 Aug 2023 20:53 #279210
by cornholio
Replied by cornholio on topic Converting a 7i76e config to 7c81/7i76 pair
I could never get a spi device with bookworm tried for about a day or so but no luck, so I just went with Raspbian based on Bullseye. Have no trouble at all, even works with the Spartan-6 dev board I have with 7c81 firmware loaded.
Seriously Pete from MESA is a top guy. His range of products and support take Linuxcnc to the next level.
Seriously Pete from MESA is a top guy. His range of products and support take Linuxcnc to the next level.
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28 Aug 2023 21:02 #279214
by rodw
The issue was we used a non-standard way to talk to the GPIO's which became depreciated in Bookworm. Andy has done some changes to get gpio working. He has also written a new gpio driver that uses the gpiod library which is the correct method. BUt I don't think its been included yet.
Replied by rodw on topic Converting a 7i76e config to 7c81/7i76 pair
I think this has been resolved on Bookworm recently but you will have to compile from source to get the changes (which I am doing now).I could never get a spi device with bookworm tried for about a day or so but no luck, so I just went with Raspbian based on Bullseye. Have no trouble at all, even works with the Spartan-6 dev board I have with 7c81 firmware loaded.
Seriously Pete from MESA is a top guy. His range of products and support take Linuxcnc to the next level.
The issue was we used a non-standard way to talk to the GPIO's which became depreciated in Bookworm. Andy has done some changes to get gpio working. He has also written a new gpio driver that uses the gpiod library which is the correct method. BUt I don't think its been included yet.
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28 Aug 2023 21:24 #279217
by cornholio
Replied by cornholio on topic Converting a 7i76e config to 7c81/7i76 pair
I was under the impression that the hm2-rpspi required a entry in the dev folder for spi and the Hal gpio driver was a different beast.
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28 Aug 2023 21:29 #279218
by rodw
Replied by rodw on topic Converting a 7i76e config to 7c81/7i76 pair
I don't know as I have never used any GPIO stuff. Perhaps by the end of the week I will have a working PI image. It is certainly worth testing. If it was still an issue, report it on git and it might get fixed.
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28 Aug 2023 23:32 #279225
by acondit
Replied by acondit on topic Converting a 7i76e config to 7c81/7i76 pair
I found the spi-bcm2835.c source in with the kernel source. I will take a look at the possibility of setting spi enable as an option in the kernel configuration.
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29 Aug 2023 01:22 #279235
by cornholio
Replied by cornholio on topic Converting a 7i76e config to 7c81/7i76 pair
With the debian package linux-image-6.1.0-11-rt-arm64-unsigned_6.1.38-4_arm64.deb spi-bcm2835 is configured as a module.
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29 Aug 2023 03:27 #279245
by rodw
Replied by rodw on topic Converting a 7i76e config to 7c81/7i76 pair
Does that mean you have been chasing a red herring?With the debian package linux-image-6.1.0-11-rt-arm64-unsigned_6.1.38-4_arm64.deb spi-bcm2835 is configured as a module.
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29 Aug 2023 04:14 - 29 Aug 2023 04:17 #279252
by cornholio
Replied by cornholio on topic Converting a 7i76e config to 7c81/7i76 pair
Nah there seems to be an issue with device overlays, which the mainline kernel doesn't seem to support.
Found this bit of infoRaspbian kernel config:
Debian arm64 rt kernel config
Found this bit of info
For /sys/kernel/config/device-tree/overlays/ you should have a kernel built with CONFIG_OF_CONFIGFS=y (which is not an upstream feature but available in some kernels).rmurphy@rpi4-cnc:~ $ cat /boot/config-5.15.65-rt49-v8+ | grep "OF_CONFIGFS"
CONFIG_OF_CONFIGFS=y
rmurphy@rpi4-cnc:~ $Debian arm64 rt kernel config
rmurphy@ThinkPad-T530:~/Documents/Kernel/linux-image-6.1.0-11-rt-arm64_6.1.38-4_arm64/boot$ cat config-6.1.0-11-rt-arm64 | grep "OF_CONFIGFS"
rmurphy@ThinkPad-T530:~/Documents/Kernel/linux-image-6.1.0-11-rt-arm64_6.1.38-4_arm64/boot$
Last edit: 29 Aug 2023 04:17 by cornholio.
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29 Aug 2023 04:22 #279253
by cornholio
Replied by cornholio on topic Converting a 7i76e config to 7c81/7i76 pair
Further to that, which maybe of interest, the Raspbian team are still working on a Bookworm release.
I guess that they patch the kernel for the device overlay tree which is needed to need to get the whole spi overlay loaded.
I guess that they patch the kernel for the device overlay tree which is needed to need to get the whole spi overlay loaded.
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29 Aug 2023 18:00 #279305
by acondit
Replied by acondit on topic Converting a 7i76e config to 7c81/7i76 pair
I have spi-bcm2835 loading on boot now. I still don't have the /dev/spi0.0 and/or /dev/spi0.1 being created.
I don't find a module spidev. It looks like it should be a kernel module but some of the info sounds like it may be a user module for talking to spi-bcm2835.
I don't find a module spidev. It looks like it should be a kernel module but some of the info sounds like it may be a user module for talking to spi-bcm2835.
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