spi no signal (UP Xtreme i7C1-8565U (V0 stepping))
I bought 3 more UP xtreme 2 months ago and all 3 new units have SPI problems.
This issue only occurs on newly purchased products, not on previously purchased products.
The product I purchased is a UP Xtreme i7C1-8565U (V0 stepping) model, and I think it will be similar to the model I have (i7 in 2020).
OS: ubuntu 18.04
kernel: 5.4.65 RT (I made it after seeing this link: https://github.com/raess1/UPxtreme-RT-kernel)
To explain in detail, if you check the signal through the oscilloscope without connecting the control board to 40pin of UP xtreme after setting the board, you can see that it is normally output.
However, when the existing control board (STM32 F474) is connected, the SPI signal (CLOCK, MOSI, MISO, CS all) is not output.
In /dev, spidev0.0 and spidev0.1 are visible, but when the signal is checked with an oscilloscope, no signal is seen.
After that, SPI communication does not work in any case until the OS is reinstalled.
After reinstallation, some boards are capable of SPI communication (2 units, the same problem recurs when a control board is connected), and some boards still do not (1 unit).
The control board was connected to the existing UP xtreme and used without any problem, and the OS and kernel have not been changed.
There is no history of updating CMOS settings and firmware.
Please let me know how I can solve this problem.
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