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[RPI][UART][UBOOT] direct U-boot console to UART instead of suppressing it entirely

Alessandro Pecugi requested to merge boot-output-on-uart into kirkstone

The U-boot output was suppressed to prevent it from covering the boot logo. See: !2 (d7cbf00f) These commits:

  • re-enable the u-boot console output;
  • enable the UART (GPIOs 14 and 15 on rpi4) by default;
  • direct the console output to the UART only.

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