I can pass the Loopback Test on TX2 dev board by short J21 pin19/21 according to the following website.
But our carrier board use SPI0_MOSI/SPI0_MISO(F4/E4) as SPI interface, after add SPIDev in kernel and modify dtb files, I can’t pass the loopback test on our carrier board. I tried to modify dtb file to enable /dev/spi0.0, /dev/spi1.0, /dev/spi2.0, /dev/spi3.0, but it doesn’t work.
Besides, why TX2 dev board J21 pin19/21 is SPI3 interface? The two pins connect to SPI1 as pin name, even if in Jetson-TX2-Generic-Customer-Pinmux-Template.xlsm, the customer usage is SPI4.
Attached is our schematic about SPI part.