Running a fresh install of Raspberry Pi OS (Bookworm), 64-bit "Lite".
$ rpi-source
*** SoC: BCM2711
*** Arch: 64-bit
*** Page Size: 4096
ERROR:
Can't find a source for this kernel
Help: https://github.com/RPi-Distro/rpi-source/blob/master/README.md
$ uname -a
Linux doorbot-tester 6.6.31+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.31-1+rpt1 (2024-05-29) aarch64 GNU/Linux
Running a fresh install of Raspberry Pi OS (Bookworm), 64-bit "Lite".