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The config is more to do with allocating the FPGA resources.

There’s actually 2 drivers involved, the hostmot2 driver which handles the “heavy lifting” and the hm2_xxxx driver which handles the physical communication.

With regards to the SPI speed just pick a speed that is reliable. There’s no need to get hung up on it.

It’s amazing what one learns when the docs are read. It’s also useful to read the manual for the card you are using as well.

Interesting, was unaware that drivers could be "shimmed" on-the-fly this way.

Ok so it looks like, to experiment with LinuxCNC SPI speed on Rpi4, something like this could be done to the .hal file:

loadrt hm2_rpspi config="num_encoders=0 num_pwmgens=0 num_stepgens=3" spiclk_rate=31250 spiclk_rate_rd=12500

Where the speeds are out of:
- 62500 - 62.500 MHz
- 41667 - 41.667 MHz
- 31250 - 31.250 MHz
- 25000 - 25.000 MHz
- 20834 - 20.833 MHz
- 17858 - 17.857 MHz
- 15625 - 15.625 MHz
- 13889 - 13.889 MHz
- 12500 - 12.500 MHz
- 11364 - 11.364 MHz
- 10417 - 10.417 MHz
- 9616 - 9.615 MHz

I'm looking for free cam software / g code generators for up to 5 axes cnc that works with linux cnc on a raspberry pi 5 for free or under $100. 

Odroid H3+ any time of the day. I've had mine for ~4 years never has missed a beat.

X86 based so very very simple. Dual NICs are great for mesa ethernet cards.

Odroid H3+ vs orangepi5 ?

You can try the old-school approach and just use the parallel port.

Or the GPIO on the Raspberry Pi.

Hi,accroding to the doc saying "STM32 based controller boards

NVEM - an STM32F207 based board with Ethernet PHY chip, originally intended for Mach3. [No longer in production, Legacy Support - no new features]

EC500 - an STM32F407 based board with Ethernet PHY chip, originally intended for Mach3. [No longer in production, Legacy Support - no new features]

Expatria Technologies Flexi-HAL with uFlexiNET Ethernet adapter - an STM32F446 based board with W5500 Ethernet SPI adapter designed for Remora

iMX RT1052 based controller boards

NVEM, EC300 & EC500 - iMXRT1052 based controller boards with Ethernet PHY chip, originally intended for Mach3. [In active development]

RP2040 based controller boards

WIZnet W5500-EVB-Pico - Raspberry Pi RP2040 based development board with on-board W5500 Ethernet SPI adapter

Expatria Technologies PicoBOB-DLX - Raspberry Pi RP2040 based board with on-board W5500 Ethernet SPI adapter designed for Remora" it looks there is many alternative choice except for mesa board. but it also said these board is originally disigned for Mach3 ,need to be flashed the firmware.I dont know where to find those program ,could you tell me the links? Thanks you !

Change in your ini file
SERVO_PERIOD = 1000000
to
SERVO_PERIOD = 2000000

Change
SERVO_PERIOD = 1000000

to
SERVO_PERIOD = 2000000

How to lower the servo thread period?

Sorry mate didn't realise you were still crook. 10 days did my head in when I had my femur fixed up with a Ti rod.

Feel free to fork my repo and take over the management of the installer.
15 days in hospital with still no Idea what is going on has made me a dat grumpy!