Thanks for reaching out.
About the TFT display, I have found this thread of another user that used the display, maybe it can be helpful for your issue: https://communities.intel.com/thread/55285.
Regarding the speed, well we are not sure if it is slow because you are using SPI, but there isn't a way to fix it.
Now, the question about using Arduino IDE and Linux, it is not stupid at all, it is a good question. And yes it is possible, in your case I think that the best way to do this is using a file with all the data that can be read from on both sides. Take a look at this article: https://software.intel.com/en-us/blogs/2015/05/05/efficient-data-sharing-using-interrupts-on-intel-edison
I hope you find this information useful.
Have a nice day.
I'm still having the same issue. The link you posted didn't help much as it was not so much related to my question. I got the display working, but super slow. Maybe you saw that I updated the question above, after some tests I think the issue is not SPI or SPI with Intel, but something else related to DC and CS. They are done super slow, most of the time, the SPI is waiting.
Currently I'm trying to run the display with the Intel IoT Studio, but also there I face significant trouble, I posted that also...
If the galileo board didn't have the PCIe slot, I would have given up long ago. In case I find a solution, I'll post it here.
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Have a nice day.