mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-20 18:23:08 +00:00
24 lines
1 KiB
Text
24 lines
1 KiB
Text
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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
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configurations (defconfig files). The only difference is the UART that
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is used as the U-Boot console UART. The default defconfig file:
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conga-qeval20-qa3-e3845_defconfig
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provides this console on the UART0 which is provided via a Winbond
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Super-IO chip connected on the congatec Qseven 2.0 evaluation carrier
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board (conga-QEVAL). This UART is the one provided with a SubD9
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connector on the mainboard (the low one). The 2nd defconfig file:
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conga-qeval20-qa3-e3845-internal-uart_defconfig
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provides the U-Boot console on the BayTrail internal legacy UART,
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which is routed from the QSeven SoM to the X300 connector on the
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baseboard. Here is called COM2. The baseboard already provides the
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RS232 level shifters. So a TTL-USB UART adapter does not work in
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this case. The signals need to get connected directly to the
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RS232 level signals of the PC UART via some adapter cable.
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