LinuxCNC on Raspberry Pi 5

2 years 11 months ago #285805 by Cant do this anymore bye all

Replied by Cant do this anymore bye all on topic LinuxCNC on Raspberry Pi 5

Going by my experience the Linuxcnc hm2_rpspi driver needs a rework. So far I haven't been able to get it to work. Hopefully it shouldn't be too much or require a major rewrite.

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Calysto
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2 years 11 months ago - 2 years 11 months ago #285809 by Calysto

Replied by Calysto on topic LinuxCNC on Raspberry Pi 5

What's the difference between hm2_rpspi and hm2_spi? As far as I know I only use hm2_spi.

edit:
answer:"The hm2_rpspi HAL driver does not use /dev/spi, instead it enables and
talks to the SPI hardware directly, so it works even if the Linux kernel
doesn't know about the SPI hardware."

But why shouldn't you use the linux-kernel for talking to your mesa card? Speed?

Last edit: 2 years 11 months ago by Calysto.

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2 years 11 months ago #285814 by Cant do this anymore bye all

Replied by Cant do this anymore bye all on topic LinuxCNC on Raspberry Pi 5

Neither does hm2_spi work.

Code:

alcmd: loadrt hostmot2
Note: Using POSIX realtime
hm2: loading Mesa HostMot2 driver version 0.15
halcmd: loadrt hm2_spi spidev_path=/dev/spidev0.1 
probe 24000000
hm2/hm2_7i90.0: Low Level init 0.15
hm2/hm2_7i90.0: invalid IDROM PortWidth 0, this board has 24 pins per connector, aborting load
hm2/hm2_7i90.0: IDRom:
hm2/hm2_7i90.0:     IDRom Type: 0x9009374D
hm2/hm2_7i90.0:     Offset to Modules: 0x00184803
hm2/hm2_7i90.0:     Offset to Pin Description: 0x00400400
hm2/hm2_7i90.0:     Board Name: 
hm2/hm2_7i90.0:     FPGA Size: 0
hm2/hm2_7i90.0:     FPGA Pins: 0
hm2/hm2_7i90.0:     Port Width: 0
hm2/hm2_7i90.0:     IO Ports: 0
hm2/hm2_7i90.0:     IO Width: 0
hm2/hm2_7i90.0:     Clock Low: 0 Hz (0 KHz, 0 MHz)
hm2/hm2_7i90.0:     Clock High: 0 Hz (0 KHz, 0 MHz)
hm2/hm2_7i90.0:     Instance Stride 0: 0x00000000
hm2/hm2_7i90.0:     Instance Stride 1: 0x00000000
hm2/hm2_7i90.0:     Register Stride 0: 0x00000000
hm2/hm2_7i90.0:     Register Stride 1: 0x00000000
hm2_spi: rtapi_app_main: Invalid argument (-22)
<stdin>:2: waitpid failed /home/cnc/linuxcnc-dev/bin/rtapi_app hm2_spi
<stdin>:2: /home/cnc/linuxcnc-dev/bin/rtapi_app exited without becoming ready
<stdin>:2: insmod for hm2_spi failed, returned -1

I had to patch the mesaflash code to use 8 bit words to even get that to talk to a 7i90

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2 years 11 months ago #285815 by Cant do this anymore bye all

Replied by Cant do this anymore bye all on topic LinuxCNC on Raspberry Pi 5

Update to forum.linuxcnc.org/9-installing-linuxcnc...pi-5?start=20#285814

patched hm2_spi to force 8 bit words and driver does load.

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Calysto
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2 years 11 months ago #285932 by Calysto

Replied by Calysto on topic LinuxCNC on Raspberry Pi 5

Does that mean we can use a mesa-spi card together with a rpi5? Tomorrow I will try mine (7c80). The image rodw made, looks and works promising!
On a Rpi4 a could not make use of USB3 speed together with my SSD, now I can!

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2 years 11 months ago #285958 by Cant do this anymore bye all

Replied by Cant do this anymore bye all on topic LinuxCNC on Raspberry Pi 5

Only by building Linuxcnc yourself and patching the code for the hm2_spi driver.
I think it’s going to be a low priority for the devs unless someone who’s name ain’t mud makes some noise about it.

So mate it looks like it’s going to be up to you.

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