[Bug 295528] FreeBSD 15.1-RC1: freebsd-update upgrade from 15.0-RELEASE triggers boot loop / Kernel Panic on systems with amdgpu (drm-kmod) due to ABI mismatch during stage 1 reboot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295528

--- Comment #5 from jimm popkow <jimmbird2068@gmail.com> ---
Sorry for the false alarm/silly bug report, but I managed to fix it myself. The
whole issue was caused by a mismatch in the gpu-firmware-amd-kmod-carrizo
version between 15.0 and 15.1 (there was a slight difference in the version
numbers).

My steps to resolve this were as follows:

1.Run the standard upgrade commands:
freebsd-update upgrade -r 15.1-RC1
freebsd-update install
2.Before rebooting, I temporarily commented out the graphics loading in
/etc/rc.conf: #kld_list="amdgpu"
3. Rebooted into the standard multi-user text/root console.
4.Completely removed drm-kmod and installed it fresh, which also updated the
gpu-firmware-amd-kmod-carrizo package to the correct version.
5.Enabled amdgpu back in /etc/rc.conf.
6.Rebooted again.

After that, everything booted up perfectly!

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