1*df233e73SStefan Roese------------------------------ 2*df233e73SStefan RoeseU-Boot console UART selection: 3*df233e73SStefan Roese------------------------------ 4*df233e73SStefan Roese 5*df233e73SStefan RoeseThe U-Boot port for this congatec board currently supports two different 6*df233e73SStefan Roeseconfigurations (defconfig files). The only difference is the UART that 7*df233e73SStefan Roeseis used as the U-Boot console UART. The default defconfig file: 8*df233e73SStefan Roese 9*df233e73SStefan Roeseconga-qeval20-qa3-e3845_defconfig 10*df233e73SStefan Roese 11*df233e73SStefan Roeseprovides this console on the UART0 which is provided via a Winbond 12*df233e73SStefan RoeseSuper-IO chip connected on the congatec Qseven 2.0 evaluation carrier 13*df233e73SStefan Roeseboard (conga-QEVAL). This UART is the one provided with a SubD9 14*df233e73SStefan Roeseconnector on the mainboard (the low one). The 2nd defconfig file: 15*df233e73SStefan Roese 16*df233e73SStefan Roeseconga-qeval20-qa3-e3845-internal-uart_defconfig 17*df233e73SStefan Roese 18*df233e73SStefan Roeseprovides the U-Boot console on the BayTrail internal legacy UART, 19*df233e73SStefan Roesewhich is routed from the QSeven SoM to the X300 connector on the 20*df233e73SStefan Roesebaseboard. Here is called COM2. The baseboard already provides the 21*df233e73SStefan RoeseRS232 level shifters. So a TTL-USB UART adapter does not work in 22*df233e73SStefan Roesethis case. The signals need to get connected directly to the 23*df233e73SStefan RoeseRS232 level signals of the PC UART via some adapter cable. 24