You can refer to Jetson Nano SPI Bus Not Working - #10 by KevinFFF to step-by-step verify SPI loopback test first.
DTB should be under /boot/dtb/kernel_XXXX.dtb.
Or you can sync the kernel source and build it manually.
You can refer to Jetson Nano SPI Bus Not Working - #10 by KevinFFF to step-by-step verify SPI loopback test first.
DTB should be under /boot/dtb/kernel_XXXX.dtb.
Or you can sync the kernel source and build it manually.