My actual test was without any issues.
Here is my slave's boot.img file.
luckfox_pico_pro_max_spislave_bootimg.zip
You can replace it for testing to eliminate the problem caused by the device tree configuration.
On the master side, you can use luckfox-config to open the SPI configuration.
If ...

Crocodile wrote: ↑2025-10-18 9:14 Please check if the GND connections of the two devices are correct.

Checked again.
GND connections are correct.

Hello, from your log, it seems that the slave machine did not receive the data correctly. First, check if your wiring is correct; second, on the slave side, modify the device tree directly in rv1106-luckfox-pico-pro-max-ipc.dtsi for the spi0 node, and remove the unused spidev@0 and fbtft@0 nodes ...

Hello!
Got some troubles with spi communication with two luckfox pico pro max boards.
1. spi master
2. spi slave
both were configured according to the manual: https://wiki.luckfox.com/Luckfox-Pico-Pro-Max/SPI-Communication
the code was taken from the same place
logs from slave side ...