Operator error. I was apparently using the wrong UART. See
https://github.com/raspberrypi/linux/issues/3821.
** Bug watch added: github.com/raspberrypi/linux/issues #3821
https://github.com/raspberrypi/linux/issues/3821
** Changed in: linux-raspi (Ubuntu Focal)
Status: New => Invalid
** Changed in: linux-raspi (Ubuntu Groovy)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1893189
Title:
Pi 4B doesn't boot with 'earlycon=pl011,0xfe201000'
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