Mesa 7i90 in SPI mode

all i did was to take the base package from arch linux arm
github.com/archlinuxarm/PKGBUILDs/blob/m...raspberrypi/PKGBUILD

and add the rt patches from www.kernel.org/pub/linux/kernel/projects/rt/4.4/ while disabling the aufs patches (they conflict with rt)

my kernel is a bit outdated (the downside of arch linux rolling release). but it works and im hesitant to mess with it for a while.
github.com/sleepybishop/linuxcnc/tree/ch...linux-rt-raspberrypi

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Sleepybishop, I am happy to hear the hm2_rpspi is working for you. I had not considered the possible device tree issue. Thank you for pointing out the dtparam setting.

I am building CNC routers and was using BBB. The capes I used are no longer available so switching to Mesa solutions.

And I am glad you found the mesaflash update useful. You're welcome. Yes, the one hm2_spi.c change is all that is needed. This works with the RPi spidev driver. And you will need to specify the spidev_path argument to use the desired device (/dev/spidev0.0 on my Pi). A "heads up!" on something I saw - some SPI transfer timeout messages when using "Show HAL Configuration". Please let me know if you experience anything similar.

This hm2_spi.c change is also applicable to other boards. I plan to use this on the Pine64 in the near future. It's SPI driver (spi-sunxi.c) also limits its bpw value to 8.

Oh, just so there is no misunderstanding, I believe information and knowledge are treasures meant to be shared far and wide.

Have a great week! Joe

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You're welcome. Polling is a fine solution.

To make things really robust you have to make certain you can't get stuck. By this I mean if there is a busy-wait check on some condition(s) one also needs to keep track of how much time is spent waiting and if the maximum interval passes take appropriate error recovery action.

I want test Raspberry Pi 3 with LINUXCNC and SPI PLUTO-P driver . Where I can download image file for PI 3 ?