Hi Folks, Some time ago I have asked for help for mcp251xfd driver with an IMX7D, so I am somehow familar with the system. The next iteration is with a NXP LX 2160A ... new hardware platform ... new kernel (6.1.1) ... new problems ;) What is working : Driver is successfully initialised. ❯ sudo modprobe mcp251xfd [ 4493.557075] mcp251xfd spi1.2 can2: MCP2518FD rev0.0 (-RX_INT -PLL -MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD o:40.00MHz c:40.00MHz m:8.00MHz rs:8.00MHz es:0.00MHz rf:8.00MHz ef:0.00MHz) successfully initialized. If I use a "wrong" interrupt for testing purposes (interrupt wont get it to the driver code), I am able to send one CAN Message from SPI CAN to LX2160A internal CAN (cangen/candump). Then the driver stuck. This is more or less expected. Enable the interrupt on the right pin (IRQ_LEVEL_LOW) does make some trouble. Driver is successfully initialised. If I bring up the interface (ip link set canx type can bitrate 500000 ; ip link set canx up) I will get contineous errors: . . . [ 508.352616] mcp251xfd spi1.2 can2: CRC write error detected. CRC=0x6844. [ 508.362081] mcp251xfd spi1.2 can2: CRC write command format error. [ 508.368956] mcp251xfd spi1.2 can2: CRC write command format error. [ 508.375242] mcp251xfd spi1.2 can2: CRC write command format error. [ 508.381531] mcp251xfd spi1.2 can2: CRC write command format error. [ 508.387822] mcp251xfd spi1.2 can2: CRC write command format error. [ 508.394117] mcp251xfd spi1.2 can2: CRC write command format error. [ 508.400402] mcp251xfd spi1.2 can2: CRC write command format error. [ 508.406700] mcp251xfd spi1.2 can2: CRC write error detected. CRC=0x537f. . . . Since driver successfully initializes, no CRC read errors and sending a frame is working I assume SPI itself is okay. /proc/interrupt shows only one additonal interrupt during a down / up cycle. This indicates that the interrupt is never cleared via SPI. Since the error is a command error assuming the command is the one clearing the interrupt, that makes sense. What can be the reason for the command format error ? Any ideas how to investigate further ? BR Niels
