Interfacing (DSI, CSI, I2C, etc.) • Re: UART configuration in Pi 5

If you need the real system console with logs from the bootrom and the kernel you MUST use the debug UART /dev/ttyAMA10 on the small 3-pin connector.

However, if a simple login over serial is enough, then you can:
systemctl enable serial-getty@ttyAMA0.service
systemctl start serial-getty@ttyAMA0.service

No, there is no MUST for using the dedicated Boot UART connector.

Yes, Pi5 and CM5 have a dedicated Boot UART, but adding below to config.txt will make that appear on GPIO14/15adding below to kernel command line and make sure you've removed 'quiet' will also show early Boot log.neverthless, making use of J16 is preferred.

sorry, but have no idea If that will work for u-boot!

Statistics: Posted by aBUGSworstnightmare — Fri Jan 02, 2026 9:37 am

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