1*4882a593Smuzhiyun------------------------------ 2*4882a593SmuzhiyunU-Boot console UART selection: 3*4882a593Smuzhiyun------------------------------ 4*4882a593Smuzhiyun 5*4882a593SmuzhiyunThe U-Boot port for this congatec board currently supports two different 6*4882a593Smuzhiyunconfigurations (defconfig files). The only difference is the UART that 7*4882a593Smuzhiyunis used as the U-Boot console UART. The default defconfig file: 8*4882a593Smuzhiyun 9*4882a593Smuzhiyunconga-qeval20-qa3-e3845_defconfig 10*4882a593Smuzhiyun 11*4882a593Smuzhiyunprovides this console on the UART0 which is provided via a Winbond 12*4882a593SmuzhiyunSuper-IO chip connected on the congatec Qseven 2.0 evaluation carrier 13*4882a593Smuzhiyunboard (conga-QEVAL). This UART is the one provided with a SubD9 14*4882a593Smuzhiyunconnector on the mainboard (the low one). The 2nd defconfig file: 15*4882a593Smuzhiyun 16*4882a593Smuzhiyunconga-qeval20-qa3-e3845-internal-uart_defconfig 17*4882a593Smuzhiyun 18*4882a593Smuzhiyunprovides the U-Boot console on the BayTrail internal legacy UART, 19*4882a593Smuzhiyunwhich is routed from the QSeven SoM to the X300 connector on the 20*4882a593Smuzhiyunbaseboard. Here is called COM2. The baseboard already provides the 21*4882a593SmuzhiyunRS232 level shifters. So a TTL-USB UART adapter does not work in 22*4882a593Smuzhiyunthis case. The signals need to get connected directly to the 23*4882a593SmuzhiyunRS232 level signals of the PC UART via some adapter cable. 24