| Stefan Roese | ad8bfa2 | 2016-09-09 07:45:49 +0200 | [diff] [blame] | 1 | ------------------------------ |
| 2 | U-Boot console UART selection: |
| 3 | ------------------------------ |
| 4 | |
| 5 | The U-Boot port for this congatec board currently supports two different |
| 6 | configurations (defconfig files). The only difference is the UART that |
| 7 | is used as the U-Boot console UART. The default defconfig file: |
| 8 | |
| 9 | conga-qeval20-qa3-e3845_defconfig |
| 10 | |
| 11 | provides this console on the UART0 which is provided via a Winbond |
| 12 | Super-IO chip connected on the congatec Qseven 2.0 evaluation carrier |
| 13 | board (conga-QEVAL). This UART is the one provided with a SubD9 |
| 14 | connector on the mainboard (the low one). The 2nd defconfig file: |
| 15 | |
| 16 | conga-qeval20-qa3-e3845-internal-uart_defconfig |
| 17 | |
| 18 | provides the U-Boot console on the BayTrail internal legacy UART, |
| 19 | which is routed from the QSeven SoM to the X300 connector on the |
| 20 | baseboard. Here is called COM2. The baseboard already provides the |
| 21 | RS232 level shifters. So a TTL-USB UART adapter does not work in |
| 22 | this case. The signals need to get connected directly to the |
| 23 | RS232 level signals of the PC UART via some adapter cable. |