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| U-Boot console UART selection: | |
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| The U-Boot port for this congatec board currently supports two different | |
| configurations (defconfig files). The only difference is the UART that | |
| is used as the U-Boot console UART. The default defconfig file: | |
| conga-qeval20-qa3-e3845_defconfig | |
| provides this console on the UART0 which is provided via a Winbond | |
| Super-IO chip connected on the congatec Qseven 2.0 evaluation carrier | |
| board (conga-QEVAL). This UART is the one provided with a SubD9 | |
| connector on the mainboard (the low one). The 2nd defconfig file: | |
| conga-qeval20-qa3-e3845-internal-uart_defconfig | |
| provides the U-Boot console on the BayTrail internal legacy UART, | |
| which is routed from the QSeven SoM to the X300 connector on the | |
| baseboard. Here is called COM2. The baseboard already provides the | |
| RS232 level shifters. So a TTL-USB UART adapter does not work in | |
| this case. The signals need to get connected directly to the | |
| RS232 level signals of the PC UART via some adapter cable. |