Hello, We implemented the Xilinx IP AXI UART inside a Artix-7 Xilinx device. The Xilinx is seen as a PCI peripheral implementing several IO spaces to host, among others, the 4 serial ports. The PCI configuration space is configured to get the UART to be visible on IO space at 0xb000, 0xb200, 0xb400 and 0xb600. We are running a 2.6.32 linux on our embedded system, and the kernel detects our 4 new serial ports as /dev/ttyS4 to /dev/ttyS7. The system console is routed to /dev/ttyS4 (configured in the GRUB menu with 'console=ttyS4,115200') and works flawlessly. So far so good... What happens ? Early in the kernel start sequence, we get following message : "kdb: Initialization failed - no console. kdb is disabled.". This is probably caused by the lack of console at kdb start. In order to check this hypothesis, I tried to add following parameter in the command line: "console=uart8250,io,0xb400,115200n8", but the kernel freezes very soon in its starting sequence. Do you think that this IO space is available at this point of the starting sequence ? What would be the configuration parameters to be used to the early console on this specific serial port ? Thanks in advance. Best regards, Patrick Agrain -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
